JP2005140247A - Vibration control device - Google Patents

Vibration control device Download PDF

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JP2005140247A
JP2005140247A JP2003377474A JP2003377474A JP2005140247A JP 2005140247 A JP2005140247 A JP 2005140247A JP 2003377474 A JP2003377474 A JP 2003377474A JP 2003377474 A JP2003377474 A JP 2003377474A JP 2005140247 A JP2005140247 A JP 2005140247A
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inner cylinder
vibration isolator
rubber
cylinder
stopper
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JP3959527B2 (en
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Seiya Takeshita
盛也 竹下
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to CN 200410079759 priority patent/CN1614259A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of easily setting a spring constant in a small displacement region in the axial direction of an inner cylinder and effectively raising a load-flexure curve while preventing the occurrence of noise in large displacement. <P>SOLUTION: This vibration control device is provided with the inner cylinder 12, an outer cylinder 14 and a body rubber part 16 for connecting both cylinders. The inner cylinder 12 comprises large-diameter collar parts 18 provided at both axial ends, and a small-diameter drum part 20 positioned between both collar parts. The body rubber part 16 connects the outer peripheral surface of the drum part 20 to the facing inner peripheral surface of the outer cylinder 14, and a space part 34 is secured at the outer periphery of the collar part 18. A stopper rubber part 24 is provided at the axial end face of the collar part 18, and a plurality of protrusions 26 are provided at the tip face of the stopper rubber part 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

自動車のエアサスペンション装置におけるショックアブソーバの上部に配置され、ショックアブソーバから伝達される振動を減衰、緩和する防振装置として、下記特許文献１に開示のものがある。   As an anti-vibration device that is disposed on an upper part of a shock absorber in an air suspension device of an automobile and attenuates and reduces vibration transmitted from the shock absorber, there is one disclosed in Patent Document 1 below.

特許文献１に開示の防振装置は、内筒と、これを取り囲む外筒と、両筒の間に介設されたゴム弾性体とからなり、内筒はその両端面にリバウントストッパとバウンドストッパとが固設された３部材で構成され、外筒は内筒よりも軸方向寸法が短く設定され、かつ、外筒の上方および下方においてゴム状弾性体に半径方向に陥没するすぐりが設けられることで、外筒の軸方向両端とこれに対向する前記リバウントストッパおよびバウンドストッパとの間で内筒の軸方向変位を制限するストッパ機構が構成されている。   The vibration isolator disclosed in Patent Document 1 includes an inner cylinder, an outer cylinder that surrounds the inner cylinder, and a rubber elastic body interposed between the two cylinders. The outer cylinder is set to be shorter than the inner cylinder in the axial direction, and the rubber cylinder is provided with a tread that is depressed in the radial direction above and below the outer cylinder. Thus, a stopper mechanism for limiting the axial displacement of the inner cylinder is configured between the axial ends of the outer cylinder and the rebound stopper and the bound stopper facing the both ends.

かかる構成からなる特許文献１に開示の防振装置では、上記のようにストッパが構成されているため、内筒と外筒とを結合する防振部としての本体ゴム部と上記ストッパのためのストッパゴム部とが単一の塊状のゴム弾性体からなり、そのため、バネ定数の設定に際し本体ゴム部とともにストッパゴム部の形状も考慮する必要が生じる。特に、上記すぐりが半径方向に陥没して設けられているため、内筒の軸方向におけるバネ定数を小さくしようとすると、外筒自体の長さを短くして軸方向のゴム量を減らす必要があるが、そうするとストッパクリアランスが大きくなることから、軸方向のバネ定数を小さくするために外筒寸法を含めた装置構成全体の見直しが必要となる。   In the vibration isolator disclosed in Patent Document 1 having such a configuration, since the stopper is configured as described above, the main body rubber portion as a vibration isolating portion that joins the inner cylinder and the outer cylinder, and the stopper The stopper rubber portion is made of a single massive rubber elastic body. Therefore, when setting the spring constant, it is necessary to consider the shape of the stopper rubber portion together with the main body rubber portion. In particular, since the above-mentioned curls are provided in the radial direction, it is necessary to reduce the amount of rubber in the axial direction by shortening the length of the outer cylinder itself in order to reduce the spring constant in the axial direction of the inner cylinder. However, since this increases the stopper clearance, it is necessary to review the entire device configuration including the outer cylinder dimensions in order to reduce the axial spring constant.

また、特許文献２には、同様なエアサスペンション装置における防振装置として、内筒と、これを取り囲む外筒と、両筒の間に介設されたゴム弾性体とからなるものが開示されている。この防振装置においては、図面上、内筒の両端に鍔の如きものが設けられ、また内筒の両端面にはストッパゴムの如きものが示されているが、その技術的意義については全く開示されていない。また、ストッパゴム部の先端面が平坦であることから、内筒の大変位時にストッパゴム部が対向するストッパ受け部に面接触することになり、異音の原因になるなどの問題がある。
特開平５−１０３７１号公報 特開平８−２８５０００号公報 Patent Document 2 discloses an anti-vibration device for a similar air suspension device, which includes an inner cylinder, an outer cylinder that surrounds the inner cylinder, and a rubber elastic body interposed between the two cylinders. Yes. In this anti-vibration device, on the drawing, there are things like scissors on both ends of the inner cylinder, and on both end faces of the inner cylinder, things like stopper rubber are shown. Not disclosed. Further, since the tip end surface of the stopper rubber portion is flat, the stopper rubber portion comes into surface contact with the opposing stopper receiving portion when the inner cylinder is largely displaced, and there is a problem of causing abnormal noise.
JP-A-5-10371 JP-A-8-285000

本発明は、以上の点に鑑みてなされたものであり、内筒の軸方向におけるバネ定数の設定が容易であり、かつ、内筒の大変位時における異音の発生を防止しながら荷重−撓み曲線を効果的に立ち上げることができる防振装置を提供することを目的とする。   The present invention has been made in view of the above points, and it is easy to set the spring constant in the axial direction of the inner cylinder, and the load − An object of the present invention is to provide a vibration isolator capable of effectively raising a bending curve.

本発明の防振装置は、内筒と、該内筒を取り囲む外筒と、これら内筒と外筒との間に介設されて両筒を結合する本体ゴム部とを備える防振装置において、前記内筒が、軸方向両端部に設けられた大径の鍔部と、両鍔部の間に位置する小径の胴部とからなり、前記本体ゴム部が前記胴部の外周面とこれに対向する前記外筒の内周面との間を結合し、前記鍔部の外周には空間部が確保されるとともに、前記鍔部の軸方向端面にストッパゴム部が設けられ、該ストッパゴム部の先端面に複数の突起が設けられたものである。   An anti-vibration device according to the present invention is an anti-vibration device comprising an inner cylinder, an outer cylinder surrounding the inner cylinder, and a main body rubber portion interposed between the inner cylinder and the outer cylinder to couple the two cylinders. The inner cylinder includes a large-diameter collar provided at both axial ends, and a small-diameter trunk located between the both collars, and the main rubber part is connected to the outer circumferential surface of the trunk. And a space is secured on the outer periphery of the flange portion, and a stopper rubber portion is provided on the end surface in the axial direction of the flange portion. A plurality of protrusions are provided on the tip surface of the portion.

このように本発明の防振装置では、内筒の両端部に鍔部を設けてストッパゴム部をその軸方向外側面に設けたことにより、内筒と外筒とを結合する防振部としての本体ゴム部とストッパゴム部とが、単一の塊状としてではなく分離して設けられている。そのため、ストッパゴム部とは無関係に本体ゴム部の形状を変更して、内筒の軸方向におけるバネ定数を設定することができ、また、耐久性に優れる。   As described above, in the vibration isolator of the present invention, the flange portion is provided at both end portions of the inner cylinder and the stopper rubber portion is provided on the outer surface in the axial direction, so that the vibration isolating portion that couples the inner cylinder and the outer cylinder is provided. The main rubber part and the stopper rubber part are not provided as a single lump but separately. Therefore, the spring constant in the axial direction of the inner cylinder can be set by changing the shape of the main body rubber portion regardless of the stopper rubber portion, and the durability is excellent.

また、内筒の大変位時には、ストッパゴム部がこれに対向するストッパ受け部に当接するが、その際、本発明の防振装置であると、ストッパゴム部の先端面に複数の突起を設けたことにより、当接時の異音の発生を防止することができ、また、ストッパゴム部により荷重−撓み曲線を効果的に立ち上げることができる。   Further, when the inner cylinder is largely displaced, the stopper rubber part comes into contact with the stopper receiving part facing the stopper cylinder. At this time, the vibration isolator of the present invention is provided with a plurality of protrusions on the front end surface of the stopper rubber part. As a result, it is possible to prevent the generation of abnormal noise at the time of contact, and it is possible to effectively raise the load-deflection curve by the stopper rubber portion.

本発明の防振装置においては、前記ストッパゴム部が前記本体ゴム部から連なるゴム弾性体で形成されてもよい。その場合、本体ゴム部の軸方向両端面に内筒と同心状にすぐりを設けることによって前記鍔部の外周に当該鍔部を覆うゴム層とその外周を取り囲む前記空間部とが形成され、かつ、この空間部の隙間が前記ゴム層の厚みよりも大きく設定されていることが好ましい。   In the vibration isolator of the present invention, the stopper rubber portion may be formed of a rubber elastic body continuous from the main rubber portion. In that case, a rubber layer covering the flange portion and the space portion surrounding the outer periphery are formed on the outer periphery of the flange portion by providing a conical shape concentrically with the inner cylinder on both axial end surfaces of the main rubber portion, and It is preferable that the gap in the space is set larger than the thickness of the rubber layer.

この場合、すぐりを深くすることにより、内筒の軸方向における小変位領域でのバネ定数を容易に下げることができる。また、上記のように空間部を大きく確保して、本体ゴム部とストッパゴム部とを明確に区別して設けたことにより、互いの干渉を防いで好ましい荷重−撓み曲線を得ることができる。すなわち、上記特許文献２に図示されたように鍔部外周の空間部の隙間が小さい場合、内筒の大変位時にストッパゴム部が外筒内周面にも接触する場合があり、必要以上にバネ定数が高くなってしまうなどの問題が生じる。   In this case, the spring constant in the small displacement region in the axial direction of the inner cylinder can be easily lowered by deepening the edge. Further, as described above, a large space is ensured and the main body rubber portion and the stopper rubber portion are clearly distinguished from each other, so that a preferable load-deflection curve can be obtained while preventing mutual interference. That is, as shown in the above-mentioned Patent Document 2, when the gap of the space portion on the outer periphery of the collar portion is small, the stopper rubber portion may come into contact with the inner peripheral surface of the outer cylinder when the inner cylinder is largely displaced. Problems such as an increase in the spring constant occur.

本発明の防振装置は、エアサスペンション装置においてショックアブソーバのピストンロッドを車体に対して防振的に支承するサポートとしての使用が特に好適であり、すなわち、前記内筒はショックアブソーバのピストンロッドの先端部が挿入されて当該先端部に固定されるものであり、前記外筒は前記ピストンロッドを取り囲む密閉された空気室を形成するアウターシェルに気密状態に固定されるものであることが好ましい。   The vibration isolator of the present invention is particularly suitable for use as a support for vibration isolating the piston rod of the shock absorber with respect to the vehicle body in the air suspension device, that is, the inner cylinder is a piston rod of the shock absorber. It is preferable that a distal end portion is inserted and fixed to the distal end portion, and the outer cylinder is fixed in an airtight state to an outer shell forming a sealed air chamber surrounding the piston rod.

本発明の防振装置であると、内筒の軸方向における小変位領域でのバネ定数の設定が容易であり、かつ、大変位時における異音の発生を防止しながら荷重−撓み曲線を効果的に立ち上げることができる。   With the vibration isolator of the present invention, it is easy to set the spring constant in the small displacement region in the axial direction of the inner cylinder, and the load-deflection curve is effective while preventing the generation of abnormal noise during large displacement. Can be launched.

以下、本発明の１実施形態に係る防振装置について図面に基づいて説明する。   Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

本実施形態の防振装置１０は、自動車のエアサスペンション装置１におけるショックアブソーバ２の上部に配置され、ショックアブソーバ２から伝達される振動を減衰、緩和するものであり、図１はその縦断面図（図２のＩ−Ｉ線断面図）、図２は平面図、図３は底面図、図４は組付け状態での縦断面図である。   The vibration isolator 10 of the present embodiment is disposed on the upper part of the shock absorber 2 in the air suspension apparatus 1 of an automobile, and attenuates and reduces vibration transmitted from the shock absorber 2. FIG. 1 is a longitudinal sectional view thereof. FIG. 2 is a plan view, FIG. 3 is a bottom view, and FIG. 4 is a longitudinal sectional view in an assembled state.

この防振装置１０は、ショックアブソーバ２のピストンロッド２ａに取り付けられる金属製の内筒１２と、内筒１２を同心的に取り囲みエアサスペンション装置１のアウターシェル３に固定される金属製の外筒１４と、これら内筒１２と外筒１４との間に介設されて両者を結合するゴム弾性体からなる本体ゴム部１６とを備えてなる。   The vibration isolator 10 includes a metal inner cylinder 12 attached to the piston rod 2a of the shock absorber 2, and a metal outer cylinder concentrically surrounding the inner cylinder 12 and fixed to the outer shell 3 of the air suspension apparatus 1. 14 and a main body rubber portion 16 made of a rubber elastic body interposed between the inner cylinder 12 and the outer cylinder 14 to couple them together.

内筒１２は、軸方向両端部に位置して半径方向外方に広がる大径かつ肉厚の鍔部１８，１８と、両鍔部１８，１８の間に位置する小径かつ肉薄の胴部２０とからなる括れ形状をなし、鍛造などにより一体に成形されている。鍔部１８の軸方向内側の側面１８ａは、軸方向内方ほど小径となるように傾斜した傾斜面状に形成されている。一方、鍔部１８の軸方向端面（即ち、鍔部１８の軸方向外側の側面）１８ｂは、内筒１２の軸方向端面であり、当該軸方向に垂直な平面として形成されている。胴部２０は、鍔部１８よりも小径で、かつ軸方向に一定の外径を持つ。   The inner cylinder 12 has large-diameter and thick flange portions 18 and 18 that are located at both ends in the axial direction and spread outward in the radial direction, and a small-diameter and thin barrel portion 20 that is positioned between both flange portions 18 and 18. It is formed in a single piece by forging or the like. The side surface 18a on the inner side in the axial direction of the flange portion 18 is formed in an inclined surface shape that is inclined so as to have a smaller diameter inward in the axial direction. On the other hand, the axial end surface (that is, the axially outer side surface of the flange portion 18) 18b of the flange portion 18 is the axial end surface of the inner cylinder 12, and is formed as a plane perpendicular to the axial direction. The trunk portion 20 has a smaller diameter than the flange portion 18 and a constant outer diameter in the axial direction.

外筒１４は、内筒１２よりも軸方向寸法の長く、かつ内径および外径が略一定の円筒状をなし、下端部の外周面にシール部材としてのＯリング４を装着するための凹溝２２を備える。   The outer cylinder 14 has a cylindrical shape that is longer in the axial direction than the inner cylinder 12 and has a substantially constant inner diameter and outer diameter, and a concave groove for mounting an O-ring 4 as a seal member on the outer peripheral surface of the lower end portion. 22.

本体ゴム部１６は、内筒１２の胴部２０の外周面と、これに対向する外筒１４の内周面とに加硫接着され、両者の間を結合している。より詳細には、本体ゴム部１６は、胴部２０の外周面と、その両側の鍔部１８の傾斜した側面１８ａと、これらの外周を取り囲む外筒１４の内周面とで規定される空間を埋めるように、内外筒１２，１４間に充填されている。   The main rubber part 16 is vulcanized and bonded to the outer peripheral surface of the body part 20 of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 14 opposed to the main body rubber part 16 to couple the two together. More specifically, the main rubber portion 16 is a space defined by the outer peripheral surface of the body portion 20, the inclined side surfaces 18a of the flange portions 18 on both sides thereof, and the inner peripheral surface of the outer cylinder 14 surrounding these outer peripheries. Is filled between the inner and outer cylinders 12,14.

鍔部１８の上下両端面１８ｂ，１８ｂには、内筒１２の軸方向変位を制限するためのストッパゴム部２４，２４が設けられている。このストッパゴム部２４は、鍔部１８の端面１８ｂから軸方向外方に突出するように当該端面１８ｂに加硫接着され、鍔部１８の全周にわたってリング状に設けられている。   Stopper rubber portions 24 and 24 for limiting the axial displacement of the inner cylinder 12 are provided on the upper and lower end faces 18b and 18b of the flange portion 18, respectively. The stopper rubber portion 24 is vulcanized and bonded to the end surface 18 b so as to protrude axially outward from the end surface 18 b of the flange portion 18, and is provided in a ring shape over the entire periphery of the flange portion 18.

ストッパゴム部２４の先端面（即ち、軸方向外側面）には、軸方向に突出する複数の突起２６が設けられている。この突起２６は、略半球状をなしており、図２，３に示すように、本実施形態では周方向に８個設けられている。ストッパゴム部２４の先端面には、僅かに陥没する溝２８が９０°間隔で４本設けられており、この溝２８によりストッパゴム部２４は周方向に４つの領域に区画され、各領域に２個ずつ上記突起２６が設けられている。また、上面側のストッパゴム部２４（図２参照）と下面側のストッパゴム部２４（図３参照）とでは、上記溝２８が４５°の角度ずらされた位置関係に配されている。また、各領域の２つの突起２６の中間位置において、ストッパゴム部２４の外周面には、僅かに突出して軸方向に延びる凸条２９が設けられている。上記溝２８は、内筒１２の軸方向変位によりストッパゴム部２４がストッパ受け部５ａ，５ｂに押し当てられたときに、ストッパゴム部２４の内周側と外周側との空間を連通させて空気を逃がす空気流路として作用するものであり、異音防止を図ることができる。   A plurality of protrusions 26 protruding in the axial direction are provided on the tip end surface (that is, the outer surface in the axial direction) of the stopper rubber portion 24. The protrusions 26 are substantially hemispherical, and as shown in FIGS. 2 and 3, eight protrusions 26 are provided in the circumferential direction in this embodiment. The stopper rubber portion 24 is provided with four slightly recessed grooves 28 at 90 ° intervals on the front end surface. The groove 28 divides the stopper rubber portion 24 into four regions in the circumferential direction. The protrusions 26 are provided two by two. In addition, the groove 28 is disposed in a positional relationship where the stopper rubber portion 24 on the upper surface side (see FIG. 2) and the stopper rubber portion 24 on the lower surface side (see FIG. 3) are shifted by 45 degrees. Further, at an intermediate position between the two protrusions 26 in each region, a convex strip 29 that slightly protrudes and extends in the axial direction is provided on the outer peripheral surface of the stopper rubber portion 24. The groove 28 communicates the space between the inner peripheral side and the outer peripheral side of the stopper rubber portion 24 when the stopper rubber portion 24 is pressed against the stopper receiving portions 5a and 5b due to the axial displacement of the inner cylinder 12. It acts as an air flow path for escaping air and can prevent abnormal noise.

ストッパゴム部２４は、本体ゴム部１６から連なるゴム弾性体で形成されており、本体ゴム部１６の軸方向両端面に内筒１２と同心状にすぐり３０を設けることによって、鍔部１８の外周には、当該鍔部１８を覆う薄肉のゴム層３２と、その外周を取り囲む環状の空間部３４とが形成されている。すぐり３０は、本体ゴム部１６の端面から軸方向内方に陥没して設けられており、内筒１２の鍔部１８の外周を取り囲むように全周にわたって設けられている。また、すぐり３０の深さは、胴部２０までには至らない鍔部１８形成範囲内で終端するように設定されている。   The stopper rubber portion 24 is formed of a rubber elastic body continuous from the main body rubber portion 16, and the outer periphery of the flange portion 18 is provided by providing the straight portions 30 concentrically with the inner cylinder 12 on both axial end surfaces of the main body rubber portion 16. A thin rubber layer 32 covering the flange 18 and an annular space 34 surrounding the outer periphery thereof are formed. The curl 30 is provided so as to be recessed inward in the axial direction from the end surface of the main rubber part 16, and is provided over the entire circumference so as to surround the outer periphery of the flange part 18 of the inner cylinder 12. Further, the depth of the straight 30 is set so as to end within a range where the flange 18 is not formed up to the body 20.

鍔部１８の外周を取り囲む空間部３４の隙間（半径方向における隙間）Ｓは、その内側のゴム層３２の厚みＴよりも大きく、より詳細にはＴの３倍以上に設定されており、これにより、内筒１２の大変位時にもストッパゴム部２４が外筒１４の内周面に接触しないようになっている。   The space S (gap in the radial direction) S surrounding the outer periphery of the flange portion 18 is larger than the thickness T of the rubber layer 32 on the inner side, and more specifically, is set to be three times or more of T. Thus, even when the inner cylinder 12 is largely displaced, the stopper rubber portion 24 does not contact the inner peripheral surface of the outer cylinder 14.

防振装置１０を製造する際には、内筒１２と外筒１４とを不図示の加硫成形型内にセットし、ゴムを注入して、本体ゴム部１６とストッパゴム部２４とを加硫成形する。そして、加硫後に絞り加工を行い、外筒１４の外径を数％縮小させることにより、本体ゴム部１６を予圧縮して耐久性を付与する。次いで、外筒１４に切削加工を行い、Ｏリング４のための凹溝２２を形成することにより、上記防振装置１０が得られる。   When the vibration isolator 10 is manufactured, the inner cylinder 12 and the outer cylinder 14 are set in a vulcanization mold (not shown), rubber is injected, and the main rubber portion 16 and the stopper rubber portion 24 are added. Sulfur molding. Then, drawing is performed after vulcanization, and the outer diameter of the outer cylinder 14 is reduced by several percent, whereby the main rubber portion 16 is pre-compressed to provide durability. Next, the vibration isolator 10 is obtained by cutting the outer cylinder 14 to form the concave groove 22 for the O-ring 4.

このように得られた防振装置１０は、図４に示すように、エアサスペンション装置１のアウターシェル３の上部に設けられた筒状ホルダ５内に外筒１４が嵌入され、内筒１２内にショックアブソーバ２のピストンロッド２ａの先端部が挿入されてナット６で締め付けることにより、車両に組付けられる。   As shown in FIG. 4, the vibration isolator 10 thus obtained has an outer cylinder 14 fitted into a cylindrical holder 5 provided on the upper part of the outer shell 3 of the air suspension apparatus 1, and the inner cylinder 12 The tip end of the piston rod 2a of the shock absorber 2 is inserted into and tightened with a nut 6 to be assembled to the vehicle.

アウターシェル３は、ピストンロッド２ａを取り囲む空気室７を形成する部材であり、その上部に上記筒状ホルダ５が設けられている。そして、このホルダ５内にＯリング４を取り付けた防振装置１０を嵌入することにより、外筒１４はアウターシェル３の内周面に気密状態に固定される。筒状ホルダ５の底部には、下側のストッパゴム部２４が当接する板状のストッパ受け部５ａが設けられ、筒状ホルダ５の上部には、上側のストッパゴム部２４が当接する板状のストッパ受け部５ｂが設けられており、両ストッパ受け部５ａ，５ｂ間で内筒１２の軸方向変位が制限されるように構成されている。なお、アウターシェル３にはボルト８が固設されており、このボルト８を介して車体９に取り付けられる。   The outer shell 3 is a member that forms an air chamber 7 that surrounds the piston rod 2a, and the cylindrical holder 5 is provided on the upper portion thereof. And the outer cylinder 14 is fixed to the inner peripheral surface of the outer shell 3 in an airtight state by inserting the vibration isolator 10 having the O-ring 4 attached into the holder 5. A plate-like stopper receiving portion 5 a with which the lower stopper rubber portion 24 abuts is provided at the bottom of the cylindrical holder 5, and a plate shape with which the upper stopper rubber portion 24 abuts on the upper portion of the cylindrical holder 5. The stopper receiving portion 5b is provided, and the axial displacement of the inner cylinder 12 is limited between the stopper receiving portions 5a and 5b. A bolt 8 is fixed to the outer shell 3 and is attached to the vehicle body 9 via the bolt 8.

以上よりなる本実施形態の防振装置１０では、ピストンロッド２ａの軸方向における入力により内筒１２が軸方向に変位するとき、微小変位域では、上記すぐり３０を設けたことにより、バネ定数が低く、即ち柔らかい特性が得られる。そして、変位が大きくなると、鍔部１８の側面１８ａが傾斜していることによって、この傾斜面で本体ゴム部１６が軸方向に圧縮されて荷重−撓み曲線が立ち上がり、即ちバネ定数が高くなる。また、ストッパゴム部２４がストッパ受け部５ａ，５ｂに当接し、鍔部１８との間で圧縮されることにより、荷重−撓み曲線が更に立ち上がる。また、特にストッパゴム部２４の先端面に複数の突起２６を設けたことにより、当接時の異音の発生を防止することができ、またストッパゴム部２４全体が圧縮されることに先立って突起２６が圧縮されることにより荷重−撓み曲線の立ち上がりを滑らかにすることができる。すなわち、突起２６は、ストッパゴム部２４の一般面が当接する際の荷重−たわみ曲線の急激な立ち上がり特性を緩和する作用を持ち、このようにして理想的なバネ特性が得られる。   In the vibration isolator 10 of the present embodiment configured as described above, when the inner cylinder 12 is displaced in the axial direction by the input in the axial direction of the piston rod 2a, the spring constant is provided in the minute displacement region by providing the straightening 30. Low or soft properties are obtained. When the displacement increases, the side surface 18a of the flange portion 18 is inclined, so that the main rubber portion 16 is compressed in the axial direction on this inclined surface, and a load-deflection curve is raised, that is, the spring constant is increased. Further, the stopper rubber portion 24 comes into contact with the stopper receiving portions 5a and 5b and is compressed between the stopper portion 18 and the load-deflection curve further rises. In particular, by providing a plurality of protrusions 26 on the front end surface of the stopper rubber portion 24, it is possible to prevent the generation of noise during contact, and prior to the entire stopper rubber portion 24 being compressed. The rise of the load-deflection curve can be smoothed by the protrusion 26 being compressed. That is, the protrusion 26 has an action of relaxing the sudden rise characteristic of the load-deflection curve when the general surface of the stopper rubber portion 24 abuts, and thus an ideal spring characteristic is obtained.

また、ストッパゴム部２４は、ストッパ受け部５ａ，５ｂとの間に所定のクリアランスを設けて配されており、ストッパ受け部５ａ，５ｂに当接した後は大変位を抑制して、耐久性向上を図っている。   Further, the stopper rubber portion 24 is arranged with a predetermined clearance between the stopper receiving portions 5a and 5b, and after contacting the stopper receiving portions 5a and 5b, a large displacement is suppressed and durability is improved. We are trying to improve.

また、本実施形態の防振装置１０であると、内筒１２の両端部に鍔部１８，１８を設けてその端面１８ｂにストッパゴム部２４を設けたことにより、本体ゴム部１６とストッパゴム部２４とが単一の塊状としてではなく分離して設けられている。そのため、ストッパゴム部２４とは無関係に本体ゴム部１６の形状を変更して、即ちすぐり３０を深くすることにより、内筒１２の軸方向における低荷重域でのバネ特性を柔らかくすることができる。   Further, in the vibration isolator 10 of the present embodiment, the main body rubber portion 16 and the stopper rubber are provided by providing the flange portions 18 and 18 at both ends of the inner cylinder 12 and the stopper rubber portion 24 at the end face 18b. The part 24 is provided not separately as a single lump. Therefore, the spring characteristic in the low load region in the axial direction of the inner cylinder 12 can be softened by changing the shape of the main rubber part 16 irrespective of the stopper rubber part 24, that is, by deepening the straightening 30. .

また、すぐり３０の先端形状については、鍔部１８を覆うゴム層３２とその外周の外筒１４との間のクリアランスを一定のＲ（曲率半径）でつなぐことが一般的であるが、本実施形態では、内筒１２の軸方向に初期荷重を持って使用する場合などを考慮して、初期荷重が入力されたときに理想的な先端形状になるように、形状に工夫を施している。すなわち、この実施形態では、内筒１２の軸方向上方に向けて初期荷重が入力されるため、図１に示すように、下側のすぐり３０の先端面３１は、初期荷重が入力したときにその内周縁部３１ａと外周縁部３１ｂとが略同じ高さになるように、径方向外方ほど上方（即ち、内筒の初期荷重入力方向）に位置するよう傾斜した傾斜面状に形成されている。このようにすぐり３０の先端面３１の形状に工夫を加えることにより、耐久性面の向上や特性の改良をすることができる。なお、このすぐり形状の工夫については、エアサスペンション用防振装置に限らず、全般的な防振装置に活用することができる。   In addition, as for the tip shape of the curb 30, it is common to connect the clearance between the rubber layer 32 covering the flange portion 18 and the outer cylinder 14 on the outer periphery thereof with a constant R (curvature radius). In the embodiment, the shape is devised so that an ideal tip shape is obtained when the initial load is input in consideration of the case where the inner cylinder 12 is used with an initial load. That is, in this embodiment, since the initial load is input toward the upper side in the axial direction of the inner cylinder 12, as shown in FIG. 1, when the initial load is input, The inner peripheral edge portion 31a and the outer peripheral edge portion 31b are formed in an inclined surface shape that is inclined so as to be positioned upward (ie, in the initial load input direction of the inner cylinder) toward the outer side in the radial direction so that they are substantially the same height. ing. Thus, by improving the shape of the tip surface 31 of the curb 30, it is possible to improve the durability and improve the characteristics. In addition, about the improvement of this straight shape, it can utilize not only for the vibration isolator for air suspensions but for a general vibration isolator.

本発明の防振装置は、特に自動車のエアサスペンション装置におけるサポートとして好適であるが、これに限らず、自動車の他の防振装置として、更には各種車両、その他の防振装置として利用することができる。   The vibration isolator of the present invention is particularly suitable as a support in an automobile air suspension apparatus, but is not limited thereto, and may be used as another anti-vibration apparatus for an automobile, as well as various vehicles and other anti-vibration apparatuses. Can do.

本発明の１実施形態に係る防振装置の縦断面図である。It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. 同防振装置の平面図である。It is a top view of the vibration isolator. 同防振装置の底面図である。It is a bottom view of the vibration isolator. 同防振装置の車両への組付け状態を示す断面図である。It is sectional drawing which shows the assembly | attachment state to the vehicle of the vibration isolator.

符号の説明Explanation of symbols

２……ショックアブソーバ
２ａ……ピストンロッド
３……アウターシェル
７……空気室
１０……防振装置
１２……内筒
１４……外筒
１６……本体ゴム部
１８……鍔部
２０……胴部
２４……ストッパゴム部
２６……突起
３０……すぐり
３２……ゴム層
３４……空間部 2 …… Shock absorber 2a …… Piston rod 3 …… Outer shell 7 …… Air chamber 10 …… Vibration isolation device 12 …… Inner cylinder 14 …… Outer cylinder 16 …… Body rubber part 18 …… Hut part 20 …… Body part 24 …… Stopper rubber part 26 …… Protrusions 30 …… Turning 32 …… Rubber layer 34 …… Space part

Claims (3)

内筒と、該内筒を取り囲む外筒と、これら内筒と外筒との間に介設されて両筒を結合する本体ゴム部とを備える防振装置において、
前記内筒が、軸方向両端部に設けられた大径の鍔部と、両鍔部の間に位置する小径の胴部とからなり、前記本体ゴム部が前記胴部の外周面とこれに対向する前記外筒の内周面との間を結合し、前記鍔部の外周には空間部が確保されるとともに、前記鍔部の軸方向端面にストッパゴム部が設けられ、該ストッパゴム部の先端面に複数の突起が設けられた
ことを特徴とする防振装置。 In a vibration isolator comprising an inner cylinder, an outer cylinder that surrounds the inner cylinder, and a main body rubber portion that is interposed between the inner cylinder and the outer cylinder and connects both the cylinders,
The inner cylinder includes a large-diameter collar provided at both axial ends, and a small-diameter trunk located between the both collars, and the main rubber part is connected to the outer circumferential surface of the trunk and the outer cylinder. A space is secured on the outer periphery of the flange portion, and a stopper rubber portion is provided on the end surface in the axial direction of the flange portion. A vibration isolator comprising a plurality of protrusions provided on a tip surface of the vibration isolator. 前記ストッパゴム部が前記本体ゴム部から連なるゴム弾性体で形成され、前記本体ゴム部の軸方向両端面に前記内筒と同心状にすぐりを設けることによって前記鍔部の外周に当該鍔部を覆うゴム層とその外周を取り囲む前記空間部とが形成され、かつ、この空間部の隙間が前記ゴム層の厚みよりも大きく設定されたことを特徴とする請求項１記載の防振装置。   The stopper rubber portion is formed of a rubber elastic body continuous from the main body rubber portion, and the collar portion is provided on the outer periphery of the flange portion by providing a conical shape concentrically with the inner cylinder on both axial end surfaces of the main body rubber portion. The vibration isolator according to claim 1, wherein a rubber layer to be covered and the space surrounding the outer periphery thereof are formed, and a gap between the space is set larger than a thickness of the rubber layer. 前記内筒はショックアブソーバのピストンロッドの先端部が挿入されて当該先端部に固定されるものであり、前記外筒は前記ピストンロッドを取り囲む密閉された空気室を形成するアウターシェルに気密状態に固定されるものであることを特徴とする請求項１記載の防振装置。   The inner cylinder is inserted into the tip of a piston rod of a shock absorber and fixed to the tip, and the outer cylinder is hermetically sealed in an outer shell that forms a sealed air chamber surrounding the piston rod. 2. The vibration isolator according to claim 1, wherein the vibration isolator is fixed.
JP2003377474A 2003-11-06 2003-11-06 Vibration isolator Expired - Fee Related JP3959527B2 (en)

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