JP5997979B2 - Vibration isolator - Google Patents

Vibration isolator Download PDF

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JP5997979B2
JP5997979B2 JP2012189995A JP2012189995A JP5997979B2 JP 5997979 B2 JP5997979 B2 JP 5997979B2 JP 2012189995 A JP2012189995 A JP 2012189995A JP 2012189995 A JP2012189995 A JP 2012189995A JP 5997979 B2 JP5997979 B2 JP 5997979B2
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rubber member
vibration
rubber
vibration isolator
hole
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JP2014047822A (en
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脩史 原田
脩史 原田
定知 松村
定知 松村
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Description

本発明は、コンプレッサ等に好適に用いられる防振装置に関する。   The present invention relates to a vibration isolator suitably used for a compressor or the like.

自動車等のサスペンション装置には、左,右の前輪と左,右の後輪にそれぞれ設けたエアサスペンションを、コンプレッサから吐出される圧縮空気を用いて拡縮させることにより、車載重量の変化、運転者の好み等に応じて車高を適宜に調整することができるエアサスペンション装置が知られている。このエアサスペンション装置には、コンプレッサの作動時の振動が車体に伝達するのを抑制する防振装置が設けられている。   For suspension systems such as automobiles, the air suspension provided on the left and right front wheels and the left and right rear wheels are expanded and contracted using compressed air discharged from the compressor, thereby changing the weight of the vehicle, the driver 2. Description of the Related Art An air suspension device that can adjust the vehicle height appropriately according to the preference of the vehicle is known. This air suspension device is provided with a vibration isolator that suppresses transmission of vibrations during operation of the compressor to the vehicle body.

このエアサスペンション装置に設けられている従来の防振装置は、ゴム部材やコイルばねをコンプレッサと車体との間に設置することにより、コンプレッサ等の振動源から車体に振動が伝達するのを抑制している。   The conventional vibration isolator provided in this air suspension device suppresses transmission of vibration from a vibration source such as a compressor to the vehicle body by installing a rubber member or a coil spring between the compressor and the vehicle body. ing.

ここで、コンプレッサの作動時における振動周波数帯域で、防振効果を得るためには、当該振動周波数帯域よりも低い周波数帯域に共振点をもつ防振ゴムを用いるのが良い。これは、防振ゴムのゴム硬度を下げる(軟らかいゴムを用いる)か、防振ゴムを複雑な形状に加工することにより実現することが可能である。しかし、軟らかいゴムは、耐久性が低くなるので実際には耐久性を考慮したゴム硬度が高い(硬い)防振ゴムを使用しなければならない。また、防振ゴムを複雑な形状に加工することは、手間を有しコストが嵩むことになる。   Here, in order to obtain an anti-vibration effect in the vibration frequency band during the operation of the compressor, it is preferable to use an anti-vibration rubber having a resonance point in a frequency band lower than the vibration frequency band. This can be realized by lowering the rubber hardness of the vibration-proof rubber (using soft rubber) or by processing the vibration-proof rubber into a complicated shape. However, since soft rubber has low durability, it is actually necessary to use a vibration-proof rubber having high (hard) rubber hardness in consideration of durability. In addition, processing the vibration-proof rubber into a complicated shape is troublesome and increases the cost.

また、防振装置として、高い防振性能や耐久性を有するコイルばねを用いることが考えられる。しかし、コイルばねでは、コンプレッサ側の振動を減衰することができないので、コンプレッサに接続されたパイプ等に振動が伝達して当該パイプ等が劣化しやすくなるという問題がある。   In addition, it is conceivable to use a coil spring having high vibration isolation performance and durability as the vibration isolation device. However, since the coil spring cannot attenuate the vibration on the compressor side, there is a problem that the vibration is transmitted to a pipe connected to the compressor and the pipe is likely to deteriorate.

そこで、特許文献1には、筒状のゴム部材とコイルばねを直列に接続することにより、高い防振性能と耐久性を両立した防振装置が開示されている。   Thus, Patent Document 1 discloses a vibration isolator that achieves both high vibration isolation performance and durability by connecting a cylindrical rubber member and a coil spring in series.

特開2008−106927号公報JP 2008-106927 A

ところで、特許文献1による従来技術では、上,下方向の振動については、防振効果を得ることができるが、水平方向の振動については、上,下方向の防振効果に比べて充分な防振効果を得ることができないという問題がある。   By the way, with the prior art according to Patent Document 1, it is possible to obtain an anti-vibration effect with respect to vibrations in the upward and downward directions. There is a problem that a vibration effect cannot be obtained.

本発明は、上述した従来技術の問題に鑑みなされたもので、本発明の目的は、上,下方向と水平方向の両方向に充分な防振効果を得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-described problems of the prior art, and an object of the present invention is to provide a vibration isolator capable of obtaining a sufficient anti-vibration effect in both the upward, downward and horizontal directions. It is in.

上述した課題を解決するため、本発明は、制振すべき第1部材と第2部材との間に配される防振装置であって、前記第1部材に一側が取り付けられる筒状の第1ゴム部材と、前記第2部材に一側が取り付けられ、前記第1ゴム部材とは弾性定数が異なる特性を有する筒状の第2ゴム部材とを備え、前記第1ゴム部材および前記第2ゴム部材のそれぞれ他側は凹凸嵌合部を有し、前記第1ゴム部材、前記第2ゴム部材の軸中心側には支持部材が挿通され、前記第1ゴム部材および前記第2ゴム部材の凹凸嵌合部間に、金属材料または樹脂材料からなる部材が嵌合されていることを特徴としている。 In order to solve the above-described problem, the present invention provides a vibration isolator disposed between a first member and a second member to be damped, and is a cylindrical first member attached on one side to the first member. 1 rubber member, and a cylindrical second rubber member having one side attached to the second member and having a different elastic constant from the first rubber member, the first rubber member and the second rubber Each other side of the member has an uneven fitting portion, and a support member is inserted into the axial center side of the first rubber member and the second rubber member, and the unevenness of the first rubber member and the second rubber member A member made of a metal material or a resin material is fitted between the fitting portions .

本発明によれば、上,下方向と水平方向の両方向に充分な防振効果を得ることができる。   According to the present invention, a sufficient anti-vibration effect can be obtained in both the upward, downward, and horizontal directions.

本発明の第1の実施の形態による防振装置を第1部材と第2部材との間に設けた概略図である。It is the schematic which provided the vibration isolator by the 1st Embodiment of this invention between the 1st member and the 2nd member. 防振装置を単体で示す断面図である。It is sectional drawing which shows a vibration isolator alone. 防振装置の物理モデル図である。It is a physical model figure of a vibration isolator. 比較例による防振装置、および第1の実施の形態による防振装置の振動伝達率の周波数特性を示す特性線図である。It is a characteristic diagram which shows the frequency characteristic of the vibration transmissibility of the vibration isolator by a comparative example, and the vibration isolator by 1st Embodiment. 本発明の第2の実施の形態による防振装置を単体で示す断面図である。It is sectional drawing which shows the vibration isolator by the 2nd Embodiment of this invention alone. 防振装置の物理モデル図である。It is a physical model figure of a vibration isolator. 比較例による防振装置および第1,第2の実施の形態による防振装置の振動伝達率の周波数特性を示す特性線図である。It is a characteristic diagram which shows the frequency characteristic of the vibration transmissibility of the vibration isolator by a comparative example, and the vibration isolator by 1st, 2nd embodiment. 本発明の変形例による防振装置を単体で示す断面図である。It is sectional drawing which shows the vibration isolator by the modification of this invention alone.

本発明は、以下に説明する複数の発明を包含する発明群に属する発明であり、以下に、その発明群の実施の形態として、第1,第2の実施の形態および変形例について説明するが、そのうち、第2の実施の形態と変形例とが、本出願人が特許請求の範囲に記載した発明に対応するものである。
以下、本発明の実施の形態による防振装置を、添付図面に従って詳細に説明する。
The present invention belongs to a group of inventions including a plurality of inventions described below, and the first and second embodiments and modifications thereof will be described below as embodiments of the group of inventions. Of these, the second embodiment and the modification correspond to the invention described in the claims of the present applicant.
Hereinafter, a vibration isolator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図1ないし図4は、本発明の第1の実施の形態を示している。図1に示す第1部材1は、例えば自動車のエアサスペンション装置用のコンプレッサで、該コンプレッサは、図示しないエアサスペンションに圧縮空気を給排することにより、車高を適宜に調整することができるものである。そして、コンプレッサ(第1部材1)には、例えば平板状の取付ブラケット2が設けられており、この取付ブラケット2には、厚さ方向に貫通した取付穴2Aが設けられている。この取付穴2Aを用いて、取付ブラケット2には、後述する防振装置5が取付けられている。   1 to 4 show a first embodiment of the present invention. A first member 1 shown in FIG. 1 is, for example, a compressor for an air suspension device of an automobile, and the compressor can appropriately adjust the vehicle height by supplying and discharging compressed air to an air suspension (not shown). It is. The compressor (first member 1) is provided with, for example, a flat mounting bracket 2. The mounting bracket 2 is provided with a mounting hole 2A penetrating in the thickness direction. A vibration isolator 5 to be described later is attached to the mounting bracket 2 using the mounting hole 2A.

また、第2部材3は、例えば車体側に設けられた取付部材で、該取付部材(第2部材3)には、取付ブラケット2と同様に取付穴4Aを有する取付ブラケット4が設けられており、この取付穴4Aを用いて、取付ブラケット4には、後述する防振装置5が取付けられている。   The second member 3 is, for example, an attachment member provided on the vehicle body side, and the attachment member (second member 3) is provided with an attachment bracket 4 having an attachment hole 4A in the same manner as the attachment bracket 2. An anti-vibration device 5 to be described later is attached to the mounting bracket 4 using the mounting holes 4A.

これにより、第1部材1は、防振装置5を介して第2部材3に取付けられている。ここで、第1部材1と第2部材3とは、互いに制振すべき部材であって、本実施の形態の場合は、第1部材1と第2部材3のうち第1部材1をコンプレッサとし、第2部材3を車体側の取付部材とした場合を例示している。しかし、これに限らず第1部材1を取付部材とし、第2部材3をコンプレッサとしてもよい。   Thereby, the first member 1 is attached to the second member 3 via the vibration isolator 5. Here, the first member 1 and the second member 3 are members to be damped with each other. In the case of the present embodiment, the first member 1 out of the first member 1 and the second member 3 is a compressor. The case where the second member 3 is an attachment member on the vehicle body side is illustrated. However, the present invention is not limited to this, and the first member 1 may be an attachment member and the second member 3 may be a compressor.

次に、本実施の形態に用いられる防振装置5について説明する。   Next, the vibration isolator 5 used in this embodiment will be described.

第1部材1と第2部材3との間に配される防振装置5は、振動源である第1部材1の振動を第2部材3に伝達するのを抑制する場合と、第2部材3側の振動を第1部材1に伝達するのを抑制するためのものである。このため、図3に示すように、防振装置5は、第1部材1と第2部材3との間の振動伝達経路の途中に設けられている。この防振装置5は、図2に示すように第1ゴム部材6と、第2ゴム部材7と、支持部材9とにより構成されている。   The vibration isolator 5 disposed between the first member 1 and the second member 3 suppresses transmission of vibrations of the first member 1 that is a vibration source to the second member 3, and the second member. This is to suppress transmission of vibration on the third side to the first member 1. For this reason, as shown in FIG. 3, the vibration isolator 5 is provided in the middle of the vibration transmission path between the first member 1 and the second member 3. As shown in FIG. 2, the vibration isolator 5 includes a first rubber member 6, a second rubber member 7, and a support member 9.

第1部材1に振動伝達経路の一側が取付けられる第1ゴム部材6は、例えばゴム、合成樹脂等の弾性体からなり、筒状に形成されている。なお、第1ゴム部材6は、例えば円筒状、楕円筒状、角筒状等により形成されている。この場合、振動による応力を分散させるためには、円筒状が好ましい。   The first rubber member 6 to which one side of the vibration transmission path is attached to the first member 1 is made of an elastic body such as rubber or synthetic resin, and is formed in a cylindrical shape. The first rubber member 6 is formed, for example, in a cylindrical shape, an elliptical cylindrical shape, a rectangular cylindrical shape, or the like. In this case, in order to disperse stress due to vibration, a cylindrical shape is preferable.

第1ゴム部材6の上面6Aは、平坦な平面として形成され、第1ゴム部材6の外側面6Bには、円環状の溝部6Cが形成され、この溝部6Cに第1部材1に設けられた取付ブラケット2の取付穴2Aの周囲部分が嵌合状態で固着されている。第1部材1の垂直方向(上,下方向)および水平方向の振動は、溝部6Cを通じて第1ゴム部材6に伝わる。このため、溝部6Cが第1ゴム部材6の振動伝達経路の一側になっている。   An upper surface 6A of the first rubber member 6 is formed as a flat plane, and an annular groove 6C is formed on the outer surface 6B of the first rubber member 6, and the first member 1 is provided in the groove 6C. A peripheral portion of the mounting hole 2A of the mounting bracket 2 is fixed in a fitted state. The vertical (upward and downward) and horizontal vibrations of the first member 1 are transmitted to the first rubber member 6 through the groove 6C. For this reason, the groove 6 </ b> C is on one side of the vibration transmission path of the first rubber member 6.

一方、第1ゴム部材6の下面6Dは、第2ゴム部材7との嵌合面となって振動伝達経路の他側を構成する。この下面6Dの中央部には、断面凸状の凸部6Eが形成されている。また、第1ゴム部材6の軸中心側には、後述するボルト9Aの軸部が挿通する貫通孔6Fが上,下方向に貫通している。   On the other hand, the lower surface 6D of the first rubber member 6 serves as a fitting surface with the second rubber member 7 and constitutes the other side of the vibration transmission path. A convex portion 6E having a convex cross section is formed at the center of the lower surface 6D. Further, a through hole 6F through which a shaft portion of a bolt 9A described later is inserted passes through the first rubber member 6 in the upward and downward directions.

第2部材3に一側が取付けられる第2ゴム部材7は、第1ゴム部材6と同様に弾性体からなり、例えば円筒状、楕円筒状、角筒状等により形成されている。この場合、振動による応力を分散させるためには、円筒状が好ましい。   The second rubber member 7 whose one side is attached to the second member 3 is made of an elastic body like the first rubber member 6 and is formed in, for example, a cylindrical shape, an elliptical cylindrical shape, a rectangular cylindrical shape, or the like. In this case, in order to disperse stress due to vibration, a cylindrical shape is preferable.

そして、第2ゴム部材7は、第1ゴム部材6とは弾性定数が異なる特性を有している。本実施の形態では、第2ゴム部材7は、第1ゴム部材6よりも弾性定数(弾性率)が小さいものとしている。即ち、第2ゴム部材7は、第1ゴム部材6よりも軟らかいゴム部材として構成されている。   The second rubber member 7 has a characteristic that the elastic constant is different from that of the first rubber member 6. In the present embodiment, the second rubber member 7 has a smaller elastic constant (elastic modulus) than the first rubber member 6. That is, the second rubber member 7 is configured as a rubber member that is softer than the first rubber member 6.

第2ゴム部材7の下面7Aは、平坦な平面として形成され、第2ゴム部材7の外側面7Bには、円環状の溝部7Cが形成され、この溝部7Cに第2部材3に設けられた取付ブラケット4の取付穴4Aの周囲部分が嵌合状態で固着されている。第2部材3の垂直方向および水平方向の振動は、溝部7Cを通じて第2ゴム部材7に伝わる。このため、溝部7Cが、第2ゴム部材7の振動伝達経路の一側になっている。   The lower surface 7A of the second rubber member 7 is formed as a flat plane. An annular groove portion 7C is formed on the outer surface 7B of the second rubber member 7, and the second member 3 is provided in the groove portion 7C. A peripheral portion of the mounting hole 4A of the mounting bracket 4 is fixed in a fitted state. The vibration in the vertical direction and the horizontal direction of the second member 3 is transmitted to the second rubber member 7 through the groove portion 7C. For this reason, the groove portion 7 </ b> C is on one side of the vibration transmission path of the second rubber member 7.

一方、第2ゴム部材7の上面7Dは、第1ゴム部材6との嵌合面となって振動伝達経路の他側を構成する。この上面7Dの中央部には、断面凹状の凹部7Eが形成され、該凹部7Eは、第1ゴム部材6の凸部6Eと嵌合するものである。そして、第1ゴム部材6の下面6Dおよび凸部6Eと第2ゴム部材7の上面7Dおよび凹部7Eとにより、第1ゴム部材6と第2ゴム部材7との嵌合部は、凹凸嵌合部8として構成され、第1ゴム部材6と第2ゴム部材7とは、凹凸嵌合部8で隙間なく当接して接着または溶着されて一体となっている。   On the other hand, the upper surface 7D of the second rubber member 7 serves as a fitting surface with the first rubber member 6 and constitutes the other side of the vibration transmission path. A concave portion 7E having a concave cross section is formed in the central portion of the upper surface 7D, and the concave portion 7E is fitted with the convex portion 6E of the first rubber member 6. And the fitting part of the 1st rubber member 6 and the 2nd rubber member 7 is uneven | corrugated fitting by the lower surface 6D and the convex part 6E of the 1st rubber member 6, and the upper surface 7D and the recessed part 7E of the 2nd rubber member 7. The first rubber member 6 and the second rubber member 7 are integrated as a unit by being abutted and bonded or welded at the concave and convex fitting portion 8 without a gap.

このように、防振装置5は、第1部材1と第2部材3との間で、第1ゴム部材6と第2ゴム部材7とを上,下方向で積重ねた構造をなしている。即ち、第1ゴム部材6と第2ゴム部材7とは、第1部材1と第2部材3との間で振動伝達経路に直列に接続されている。また、第2ゴム部材7の軸中心側には、第1ゴム部材6の貫通孔6Fと同軸上に後述するボルト9Aの軸部が挿通する貫通孔7Fが上,下方向に貫通している。   As described above, the vibration isolator 5 has a structure in which the first rubber member 6 and the second rubber member 7 are stacked in the upward and downward directions between the first member 1 and the second member 3. That is, the first rubber member 6 and the second rubber member 7 are connected in series to the vibration transmission path between the first member 1 and the second member 3. Further, on the axial center side of the second rubber member 7, a through hole 7F through which a shaft portion of a bolt 9A described later is inserted coaxially with the through hole 6F of the first rubber member 6 penetrates upward and downward. .

第1ゴム部材6の貫通孔6Fと第2ゴム部材7の貫通孔7Fに挿通する支持部材9は、第1ゴム部材6と第2ゴム部材7との伸びを拘束するためのものである。そして、支持部材9は、ボルト9Aと、ナット9Bと、ワッシャ9C,9Dとにより構成されている。   The support member 9 inserted through the through hole 6 </ b> F of the first rubber member 6 and the through hole 7 </ b> F of the second rubber member 7 is for restraining the expansion of the first rubber member 6 and the second rubber member 7. The support member 9 includes a bolt 9A, a nut 9B, and washers 9C and 9D.

図2に示すように、支持部材9は、ワッシャ9Cを第1ゴム部材6の上面6A上で貫通孔6Fと同軸上に配置し、ワッシャ9Dを第2ゴム部材7の下面7A上で貫通孔7Fと同軸上に配置した状態でボルト9Aを第2ゴム部材7側から貫通孔7Fと、貫通孔6Fに挿通してナット9Bにより固定する構成としている。   As shown in FIG. 2, the support member 9 has a washer 9 </ b> C arranged coaxially with the through hole 6 </ b> F on the upper surface 6 </ b> A of the first rubber member 6, and the washer 9 </ b> D on the lower surface 7 </ b> A of the second rubber member 7. The bolt 9A is inserted into the through hole 7F and the through hole 6F from the second rubber member 7 side and is fixed by the nut 9B while being arranged coaxially with 7F.

本実施の形態による防振装置5は、上述のような構成を有するもので、次に防振装置5による防振機能について説明する。   The anti-vibration device 5 according to the present embodiment has the above-described configuration. Next, the anti-vibration function of the anti-vibration device 5 will be described.

まず、第1ゴム部材6と第2ゴム部材7とを比較すると、第1ゴム部材6は、第2ゴム部材7よりも弾性率を大きくしている。即ち、第1ゴム部材6は、第2ゴム部材7よりも硬いゴム材であり、第2ゴム部材7は、第1ゴム部材6よりも軟らかいゴム材である。防振装置5は、第1部材1と第2部材3との間に、それぞれ弾性率の異なる第1ゴム部材6と第2ゴム部材7とが直列に繋がる構成となっている(図3参照)。このため、防振装置5は、弾性率の大きい第1ゴム部材6の防振効果を得つつ、弾性率の小さい第2ゴム部材7によって共振点(共振周波数)を低くすることができる。   First, when comparing the first rubber member 6 and the second rubber member 7, the first rubber member 6 has a larger elastic modulus than the second rubber member 7. That is, the first rubber member 6 is a harder rubber material than the second rubber member 7, and the second rubber member 7 is a softer rubber material than the first rubber member 6. The vibration isolator 5 has a configuration in which a first rubber member 6 and a second rubber member 7 having different elastic moduli are connected in series between the first member 1 and the second member 3 (see FIG. 3). ). For this reason, the vibration isolator 5 can lower the resonance point (resonance frequency) by the second rubber member 7 having a small elastic modulus while obtaining the vibration isolating effect of the first rubber member 6 having a large elastic modulus.

このような防振作用について検討するために、本実施の形態による防振装置5と、比較例による防振装置とについて、加振側(例えばコンプレッサからなる第1部材1)から作用する周波数と振動伝達率との関係について解析を行った。その結果を図4に示す。図4において、横軸は、コンプレッサ(第1部材1)が作動したときの振動に伴う周波数を示し、縦軸は、その振動が取付部材(第2部材3)に伝達する割合を示す振動伝達率を示している。同図において、振動伝達率が1(100%)のときには、防振効果は0%である。   In order to examine such an anti-vibration effect, the frequency acting from the excitation side (for example, the first member 1 made of a compressor) of the anti-vibration device 5 according to this embodiment and the anti-vibration device according to the comparative example The relationship with vibration transmissibility was analyzed. The result is shown in FIG. In FIG. 4, the horizontal axis indicates the frequency associated with the vibration when the compressor (first member 1) is operated, and the vertical axis indicates the vibration transmission rate indicating the rate at which the vibration is transmitted to the mounting member (second member 3). Shows the rate. In the figure, when the vibration transmissibility is 1 (100%), the anti-vibration effect is 0%.

なお、比較例による防振装置は、第1ゴム部材6と第2ゴム部材7とを同じ弾性率のゴム材を用いて一体化して形成したものである。また、図4中には、第1ゴム部材6および第2ゴム部材7に関する振動伝達率の特性も併せて記載してある。比較例による防振装置の特性線の頂点A、第1ゴム部材6の特性線の頂点B、第2ゴム部材7の特性線の頂点C、本実施の形態の特性線の頂点Dは、それぞれの共振点を示している。   Note that the vibration isolator according to the comparative example is formed by integrating the first rubber member 6 and the second rubber member 7 using a rubber material having the same elastic modulus. FIG. 4 also shows the characteristics of the vibration transmissibility relating to the first rubber member 6 and the second rubber member 7. The vertex A of the characteristic line of the vibration isolator according to the comparative example, the vertex B of the characteristic line of the first rubber member 6, the vertex C of the characteristic line of the second rubber member 7, and the vertex D of the characteristic line of the present embodiment are respectively The resonance point is shown.

比較例の場合、使用周波数帯域の高周波数側で所望の防振効果を得るために、弾性率を大きくしてあるが、これに伴って共振点Aが使用周波数帯域の範囲内に位置している。このため、比較例では、共振点Aの周辺周波数では、防振効果が得られない。   In the case of the comparative example, in order to obtain a desired vibration isolation effect on the high frequency side of the use frequency band, the elastic modulus is increased, but with this, the resonance point A is located within the range of the use frequency band. Yes. For this reason, in the comparative example, the anti-vibration effect cannot be obtained at the peripheral frequency of the resonance point A.

これに対し、本実施の形態による防振装置5は、それぞれ弾性率が異なる第1ゴム部材6と第2ゴム部材7とを接合することによって形成されている。   On the other hand, the vibration isolator 5 according to the present embodiment is formed by joining the first rubber member 6 and the second rubber member 7 having different elastic moduli.

図4に示すように、第1ゴム部材6は、弾性率の大きいゴム材を用いたから、共振点Bよりも高周波数側では、周波数に対する振動伝達率の変化(傾き)が大きく、振動の周波数が高くなるに従って振動伝達率が低下し易い傾向がある。   As shown in FIG. 4, since the first rubber member 6 is made of a rubber material having a large elastic modulus, the vibration transmissibility change (inclination) with respect to the frequency is large on the higher frequency side than the resonance point B, and the vibration frequency There is a tendency that the vibration transmissibility tends to decrease as the value increases.

第2ゴム部材7は、弾性率の小さいゴム材を用いたから、第1ゴム部材6に比べて、共振点Cよりも高周波数側では、周波数に対する振動伝達率の変化(傾き)が小さく、振動の周波数が高くなっても振動伝達率が低下し難い傾向がある。一方、第2ゴム部材7の共振点Cは、第1ゴム部材6の共振点Bよりも低くなっている。   Since the second rubber member 7 is made of a rubber material having a low elastic modulus, the change (inclination) of the vibration transmissibility with respect to the frequency is smaller on the higher frequency side than the resonance point C compared to the first rubber member 6, and vibration is caused. Even if the frequency becomes higher, the vibration transmissibility tends not to decrease. On the other hand, the resonance point C of the second rubber member 7 is lower than the resonance point B of the first rubber member 6.

この結果、本実施の形態による防振装置5の共振点Dは、比較例の共振点Aよりも低く、使用周波数帯域よりも低周波数側に外れている。これに加えて、本実施の形態では、比較例に比べて、使用周波数帯域の全体に亘って振動伝達率が低下している。このように、本実施の形態による防振装置5では、コンプレッサ(第1部材1)の作動時に、安定した防振効果を得ることができる。   As a result, the resonance point D of the vibration isolator 5 according to the present embodiment is lower than the resonance point A of the comparative example and deviates to a lower frequency side than the use frequency band. In addition, in the present embodiment, the vibration transmissibility is reduced over the entire use frequency band as compared with the comparative example. Thus, with the vibration isolator 5 according to the present embodiment, a stable vibration isolating effect can be obtained when the compressor (first member 1) is operated.

また、第1ゴム部材6と第2ゴム部材7との接合部分は、第1ゴム部材6の下面6Dおよび凸部6Eと、第2ゴム部材7の上面7Dおよび凹部7Eとが嵌合した凹凸嵌合部8となっている。これにより、第1ゴム部材6と第2ゴム部材7とは、中心軸(ボルト9Aの軸)の法線方向と、中心軸方向の2方向の接触面を有する構成となっている。従って、中心軸の法線方向(水平方向)と、中心軸方向(垂直方向)の両方向で、図3に示すような第1ゴム部材6と第2ゴム部材7とが直列に繋がる構成とみなすことができる。このため、垂直方向に限らず、水平方向の振動についても高い防振効果を得ることができる。   Further, the joint portion between the first rubber member 6 and the second rubber member 7 is an unevenness in which the lower surface 6D and the convex portion 6E of the first rubber member 6 are fitted with the upper surface 7D and the concave portion 7E of the second rubber member 7. It is a fitting part 8. Thereby, the 1st rubber member 6 and the 2nd rubber member 7 have composition which has a normal line direction of a central axis (axis of bolt 9A), and a contact surface of two directions of a central axis direction. Accordingly, the first rubber member 6 and the second rubber member 7 as shown in FIG. 3 are considered to be connected in series in both the normal direction (horizontal direction) of the central axis and the direction of the central axis (vertical direction). be able to. For this reason, a high vibration isolation effect can be obtained not only in the vertical direction but also in the horizontal direction.

かくして、第1の実施の形態によれば、弾性定数がそれぞれ異なる第1ゴム部材6と第2ゴム部材7とを嵌合することにより、共振点を下げることができ、また高周波数側で振動伝達率を低下させて高い振動絶縁効果を得ることができる。   Thus, according to the first embodiment, by fitting the first rubber member 6 and the second rubber member 7 having different elastic constants, it is possible to lower the resonance point and to vibrate on the high frequency side. A high vibration insulation effect can be obtained by reducing the transmissibility.

また、防振装置5は、第1ゴム部材6と第2ゴム部材7との接合部分を、凹凸状に構成することにより、第1ゴム部材6と第2ゴム部材7とは、垂直方向と水平方向との両方向でそれぞれ当接している。従って、防振装置5は、第1部材1と第2部材3との間で、垂直方向(軸方向)のみならず水平方向(軸の法線方向)にも垂直方向と同様の防振絶縁効果を得ることができる。   Further, the vibration isolator 5 is configured such that the joint portion between the first rubber member 6 and the second rubber member 7 is uneven, so that the first rubber member 6 and the second rubber member 7 are in the vertical direction. They are in contact with each other in both the horizontal direction and the horizontal direction. Accordingly, the anti-vibration device 5 is provided with the same anti-vibration insulation between the first member 1 and the second member 3 not only in the vertical direction (axial direction) but also in the horizontal direction (normal direction of the axis). An effect can be obtained.

さらに、防振装置5は、異なる特性を有するゴム材を直列に接合するという単純な構造であり部品点数も少ないので、コストを低減することができると共に、組立が容易である。また、車体とコンプレッサとの間の狭隘なスペースにも簡単に設置することができる。   Furthermore, since the vibration isolator 5 has a simple structure in which rubber materials having different characteristics are joined in series and has a small number of parts, the cost can be reduced and the assembly is easy. It can also be easily installed in a narrow space between the vehicle body and the compressor.

次に、図5ないし図7は、本発明の第2の実施の形態を示している。本実施の形態の特徴は、第1ゴム部材と第2ゴム部材との間に円管を設ける構成としたことにある。なお、本実施の形態では、上述した第1の実施の形態と同一の構成要素に同一の符号を付し、その説明を省略するものとする。   Next, FIGS. 5 to 7 show a second embodiment of the present invention. A feature of the present embodiment is that a circular tube is provided between the first rubber member and the second rubber member. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

第2の実施の形態による防振装置11は、第1ゴム部材6と、第2ゴム部材7と、支持部材9と、後述する円管12とにより構成されている。   The vibration isolator 11 according to the second embodiment includes a first rubber member 6, a second rubber member 7, a support member 9, and a circular tube 12 described later.

第1ゴム部材6と第2ゴム部材7との間に設けられた円管12は、例えば金属材料からなる円盤状の薄板材の中央部を下向きに突出させて皿状に形成したものであり、その外径寸法は、第1ゴム部材6および第2ゴム部材7の外径寸法と同様に形成されている。具体的には、図5に示すように、円管12は、円環状の平板部12Aと、該平板部12Aから下向きに突出する突出部12Bとにより構成されている。   The circular tube 12 provided between the first rubber member 6 and the second rubber member 7 is formed in a dish shape by projecting the center of a disk-shaped thin plate made of, for example, a metal material downward. The outer diameter dimension is formed in the same manner as the outer diameter dimension of the first rubber member 6 and the second rubber member 7. Specifically, as shown in FIG. 5, the circular tube 12 includes an annular flat plate portion 12A and a protruding portion 12B protruding downward from the flat plate portion 12A.

そして、平板部12Aの上面12A1は、第1ゴム部材6の下面6Dと当接し、突出部12Bの内面12B1は、第1ゴム部材6の凸部6Eと当接する。一方、平板部12Aの下面12A2は、第2ゴム部材7の上面7Dと当接し、突出部12Bの外面12B2は、第2ゴム部材7の凹部7Eと当接する構成となっている。また、突出部12Bの中央部には、第1ゴム部材6の貫通孔6Fと第2ゴム部材7の貫通孔7Fと同軸上に貫通孔12Cが穿設されている。   The upper surface 12A1 of the flat plate portion 12A is in contact with the lower surface 6D of the first rubber member 6, and the inner surface 12B1 of the protruding portion 12B is in contact with the convex portion 6E of the first rubber member 6. On the other hand, the lower surface 12A2 of the flat plate portion 12A is in contact with the upper surface 7D of the second rubber member 7, and the outer surface 12B2 of the protruding portion 12B is in contact with the concave portion 7E of the second rubber member 7. In addition, a through hole 12C is formed coaxially with the through hole 6F of the first rubber member 6 and the through hole 7F of the second rubber member 7 at the center of the protruding portion 12B.

ここで、上述した第1の実施の形態では、防振装置5を第1ゴム部材6と第2ゴム部材7とを直接、接着または溶着させる構成とした。しかし、一般的にゴム同士の接着および溶着は困難である。そこで、本実施の形態においては、金属材料からなる円管12を、第1ゴム部材6と第2ゴム部材7との間、即ち凹凸嵌合部8に嵌合することにより、簡単に第1ゴム部材6と円管12との接着および第2ゴム部材7と円管12との接着を行うことができる。即ち、円管12は、第1ゴム部材6と第2ゴム部材7とを接合するための接合部材を構成している。これにより、防振装置11は、第1ゴム部材6と第2ゴム部材7とが円管12を介して一体とする構成となっている。   Here, in the first embodiment described above, the vibration isolator 5 is configured to directly bond or weld the first rubber member 6 and the second rubber member 7. However, generally, adhesion and welding of rubbers are difficult. Therefore, in the present embodiment, the first circular tube 12 made of a metal material is easily fitted between the first rubber member 6 and the second rubber member 7, that is, by the concave-convex fitting portion 8. Adhesion between the rubber member 6 and the circular pipe 12 and adhesion between the second rubber member 7 and the circular pipe 12 can be performed. That is, the circular pipe 12 constitutes a joining member for joining the first rubber member 6 and the second rubber member 7. Thereby, the vibration isolator 11 has a configuration in which the first rubber member 6 and the second rubber member 7 are integrated via the circular pipe 12.

このように、防振装置11は、防振対象である第1部材1の下側にそれぞれ弾性定数の異なる第1ゴム部材6と第2ゴム部材7とが円管12を介して直列に繋がる構成としている(図5参照)。   As described above, in the vibration isolator 11, the first rubber member 6 and the second rubber member 7 having different elastic constants are connected in series via the circular pipe 12 below the first member 1 that is the object of vibration isolation. It is configured (see FIG. 5).

そして、ボルト9Aを第2ゴム部材7の貫通孔7F、円管12の貫通孔12C、第1ゴム部材6の貫通孔6Fに挿通して、ワッシャ9C,9Dと共にナット9Bで固定する。   Then, the bolt 9A is inserted through the through hole 7F of the second rubber member 7, the through hole 12C of the circular tube 12, and the through hole 6F of the first rubber member 6, and fixed with the nut 9B together with the washers 9C and 9D.

この状態で、防振装置11は、第1部材1と第2部材3との間に設置される。このとき、支持部材9のボルト9Aは、振動の伝達経路である第1ゴム部材6に取付けられた取付ブラケット2と第2ゴム部材7に取付けられた取付ブラケット4との間に挿通しているので、第1ゴム部材6と第2ゴム部材7との伸びを拘束することができる。   In this state, the vibration isolator 11 is installed between the first member 1 and the second member 3. At this time, the bolt 9 </ b> A of the support member 9 is inserted between the mounting bracket 2 attached to the first rubber member 6 which is a vibration transmission path and the mounting bracket 4 attached to the second rubber member 7. Therefore, the elongation of the first rubber member 6 and the second rubber member 7 can be restrained.

かくして、このように構成される第2の実施の形態においても、前述した第1の実施の形態と同様の作用効果を得ることができる。   Thus, also in the second embodiment configured in this way, the same operational effects as those of the first embodiment described above can be obtained.

特に、本実施の形態の場合には、金属材料からなる円管12によりゴム材料の嵌合機能を高めることができるので、簡単に第1ゴム部材6と第2ゴム部材7とを一体とすることができる。   In particular, in the case of the present embodiment, since the fitting function of the rubber material can be enhanced by the circular pipe 12 made of a metal material, the first rubber member 6 and the second rubber member 7 are simply integrated. be able to.

図7は、比較例による防振装置と、第1の実施の形態による防振装置5と、第2の実施の形態による防振装置11とについて、振動の周波数に対する振動伝達率の解析結果を示している。図7において、横軸は、コンプレッサ(第1部材1)が作動したときの振動に伴う周波数を示し、縦軸は、その振動が取付部材(第2部材3)に伝達する割合を示す振動伝達率を示している。なお、比較例による防振装置は、第1ゴム部材6と第2ゴム部材7とを同じゴム材を用いて一体化して形成したものである。また、比較例による防振装置の特性線の頂点A、防振装置5の特性線の頂点D、防振装置11の特性線の頂点Eは、それぞれの部材の共振点を示している。   FIG. 7 shows the analysis results of vibration transmissibility with respect to the vibration frequency for the vibration isolator according to the comparative example, the vibration isolator 5 according to the first embodiment, and the vibration isolator 11 according to the second embodiment. Show. In FIG. 7, the horizontal axis indicates the frequency associated with the vibration when the compressor (first member 1) is operated, and the vertical axis indicates the vibration transmission rate indicating the rate at which the vibration is transmitted to the mounting member (second member 3). Shows the rate. The anti-vibration device according to the comparative example is formed by integrating the first rubber member 6 and the second rubber member 7 using the same rubber material. Further, the vertex A of the characteristic line of the vibration isolator according to the comparative example, the vertex D of the characteristic line of the vibration isolator 5 and the vertex E of the characteristic line of the vibration isolator 11 indicate the resonance points of the respective members.

それぞれ異なる弾性率を有する第1ゴム部材6と第2ゴム部材7とを金属製の円管12を介して嵌合(接合)した防振装置11は、比較例による防振装置の共振点Aと比べて、共振周波数が使用周波数帯域から外れて低くなっており、また高周波数側での振動伝達率が下がっていることが分かる。これにより、防振装置11は、コンプレッサ(第1部材1)の作動時に、安定した防振効果を得ることができる。   The vibration isolator 11 in which the first rubber member 6 and the second rubber member 7 having different elastic moduli are fitted (joined) via the metal circular pipe 12 is a resonance point A of the vibration isolator according to the comparative example. It can be seen that the resonance frequency is lower than the use frequency band and is lower, and the vibration transmissibility on the high frequency side is lower. Thereby, the vibration isolator 11 can obtain a stable vibration isolating effect when the compressor (first member 1) is operated.

また、円管12は、マスダンパとしての作用も得ることができる。このため、第2の実施の形態による防振装置11では、第1の実施の形態による防振装置5に比べて高周波数側での振動伝達率をさらに低下させることができる。   Further, the circular tube 12 can also act as a mass damper. For this reason, in the vibration isolator 11 according to the second embodiment, the vibration transmissibility on the high frequency side can be further reduced as compared with the vibration isolator 5 according to the first embodiment.

なお、本実施の形態では、金属材料からなる円管12を、第1ゴム部材6および第2ゴム部材7の凹凸嵌合部8間に嵌合させる構成を例に挙げて説明した。しかし、これに限らず、例えば図8に示す変形例のように円管21をプラスチック等の樹脂材料からなる部材として構成してもよい。   In the present embodiment, the configuration in which the circular tube 12 made of a metal material is fitted between the concave and convex fitting portions 8 of the first rubber member 6 and the second rubber member 7 has been described as an example. However, the present invention is not limited to this, and the circular tube 21 may be configured as a member made of a resin material such as plastic as in the modification shown in FIG.

また、上述した第1の実施の形態で、第1ゴム部材6の貫通孔6Fおよび第2ゴム部材7の貫通孔7Fとボルト9Aの軸部との接触を防ぐために、ボルト9Aの軸部と貫通孔6Fおよび貫通孔7Fとの間に円筒状のカラー(図示せず)を設けてもよい。このカラーの長さ寸法は、第1ゴム部材6および第2ゴム部材7とボルト9Aの軸部が接触しない程度に短くしてもよく、また第1ゴム部材6の貫通孔6F側と、第2ゴム部材7の貫通孔7F側とに分割してそれぞれ設けてもよい。このことは、第2の実施の形態および変形例についても同様である。   In the first embodiment described above, in order to prevent contact between the through hole 6F of the first rubber member 6 and the through hole 7F of the second rubber member 7 and the shaft portion of the bolt 9A, A cylindrical collar (not shown) may be provided between the through hole 6F and the through hole 7F. The length of the collar may be shortened so that the first rubber member 6 and the second rubber member 7 do not come into contact with the shaft portion of the bolt 9A. Two rubber members 7 may be provided separately on the through hole 7F side. The same applies to the second embodiment and the modification.

また、上述した第1の実施の形態では、ボルト9Aを第2ゴム部材7の貫通孔7F側から挿入して、第1ゴム部材6の上面6Aでナット9Bにより固定する構成を例に挙げて説明した。しかし、これに限らず、ボルト9Aを第1ゴム部材6の貫通孔6F側から挿入して、第2ゴム部材7の下面7Aでナット9Bにより固定する構成としてもよい。このことは、第2の実施の形態および変形例についても同様である。   In the first embodiment described above, a configuration in which the bolt 9A is inserted from the through hole 7F side of the second rubber member 7 and is fixed by the nut 9B on the upper surface 6A of the first rubber member 6 is taken as an example. explained. However, the configuration is not limited thereto, and the bolt 9A may be inserted from the through-hole 6F side of the first rubber member 6 and fixed by the nut 9B on the lower surface 7A of the second rubber member 7. The same applies to the second embodiment and the modification.

また、上述した第1の実施の形態では、第1ゴム部材6を第2ゴム部材7よりも硬いゴム材とした場合を例に挙げて説明した。しかし、これに限らず、第1ゴム部材6を第2ゴム部材7よりも軟らかいゴム材としてもよい。このことは、第2の実施の形態および変形例についても同様である。   Further, in the first embodiment described above, the case where the first rubber member 6 is a harder rubber material than the second rubber member 7 has been described as an example. However, the present invention is not limited to this, and the first rubber member 6 may be a softer rubber material than the second rubber member 7. The same applies to the second embodiment and the modification.

また、上述した第1の実施の形態では、第1ゴム部材6と第2ゴム部材7との接合部分である凹凸嵌合部8を、第1ゴム部材6の凸部6Eと第2ゴム部材7の凹部7Eとにより構成した場合を例に挙げて説明した。しかし、これに限らず、第1ゴム部材に凹部を形成し、第2ゴム部材に凸部を形成して凹凸嵌合部を構成してもよい。このことは、第2の実施の形態および変形例についても同様である。   Moreover, in 1st Embodiment mentioned above, the uneven | corrugated fitting part 8 which is a junction part of the 1st rubber member 6 and the 2nd rubber member 7 is used for the convex part 6E of the 1st rubber member 6, and the 2nd rubber member. The case where it is constituted by the seven concave portions 7E has been described as an example. However, the present invention is not limited thereto, and the concave / convex fitting portion may be configured by forming a concave portion in the first rubber member and forming a convex portion in the second rubber member. The same applies to the second embodiment and the modification.

さらに、凹凸嵌合部8は、第1ゴム部材6の下面6Dの中央部に形成された凸部6Eと、第2ゴム部材7の上面7Dの中央部に形成された凹部7Eとにより構成した場合を例に挙げて説明した。しかし、これに限らず、例えば第1ゴム部材の下面に複数の凸部を形成し、この凸部に対応する位置で第2ゴム部材の上面に複数の凹部を形成する構成としてもよい。即ち、第1ゴム部材と第2ゴム部材とは、上,下方向と水平方向との両方向で当接して嵌合していればよい。このことは、第2の実施の形態および変形例についても同様である。   Furthermore, the concave / convex fitting portion 8 is constituted by a convex portion 6E formed at the center portion of the lower surface 6D of the first rubber member 6 and a concave portion 7E formed at the central portion of the upper surface 7D of the second rubber member 7. The case has been described as an example. However, the present invention is not limited to this. For example, a plurality of convex portions may be formed on the lower surface of the first rubber member, and a plurality of concave portions may be formed on the upper surface of the second rubber member at positions corresponding to the convex portions. That is, the first rubber member and the second rubber member need only be in contact with each other in both the upper and lower directions and the horizontal direction. The same applies to the second embodiment and the modification.

また、上述した第1の実施の形態では、第1ゴム部材6の溝部6Cで取付ブラケット2を接合させ、第2ゴム部材7の溝部7Cで取付ブラケット4を接合させる場合を例に挙げて説明した。しかし、これに限らず、上,下方向と水平方向との2方向の振動が伝達可能であれば、このような接合手段に限らず、任意の接合手段を採用可能である。   In the first embodiment described above, the case where the mounting bracket 2 is joined by the groove 6C of the first rubber member 6 and the mounting bracket 4 is joined by the groove 7C of the second rubber member 7 will be described as an example. did. However, the present invention is not limited to this, and any joining means can be employed without being limited to such joining means as long as vibrations in the two directions of the upper, lower, and horizontal directions can be transmitted.

また、図4中の第1ゴム部材6と、第2ゴム部材7の振動伝達率の周波数特性は、一例を示したものであり、本発明はこれに限らない。即ち、第1ゴム部材と第2ゴム部材を用いることにより、共振周波数が使用周波数帯域よりも低下し、かつ共振周波数よりも高周波数側の振動伝達率が低下するのであれば、第1ゴム部材と第2ゴム部材は、互いに異なる各種の弾性率のゴム材を用いることができる。   Moreover, the frequency characteristics of the vibration transmissibility of the first rubber member 6 and the second rubber member 7 in FIG. 4 show an example, and the present invention is not limited to this. That is, if the first rubber member and the second rubber member are used and the resonance frequency is lower than the use frequency band and the vibration transmissibility on the higher frequency side than the resonance frequency is reduced, the first rubber member is used. As the second rubber member, rubber materials having various elastic moduli different from each other can be used.

また、上述した第1の実施の形態では、防振装置5を車両のエアサスペンション装置用のコンプレッサ(第1部材1)に取付ける場合を例に挙げて説明した。しかし、これに限らず、例えば防振装置5を洗濯機の脱水作動時における防振対策等、機械の運転により生じる振動が基礎等に伝達するのを抑制する場合にも広く適用することができる。このことは、第2の実施の形態および変形例についても同様である。   In the first embodiment described above, the case where the vibration isolator 5 is attached to the compressor (first member 1) for the air suspension device of the vehicle has been described as an example. However, the present invention is not limited to this. For example, the vibration isolator 5 can be widely applied to the case where vibration generated by the operation of the machine is prevented from being transmitted to the foundation or the like, such as a vibration isolating measure at the time of the washing machine dehydrating operation. . The same applies to the second embodiment and the modification.

1 第1部材
3 第2部材
5,11 防振装置
6 第1ゴム部材
7 第2ゴム部材
8 凹凸嵌合部
9 支持部材
12,21 円管
DESCRIPTION OF SYMBOLS 1 1st member 3 2nd member 5,11 Anti-vibration device 6 1st rubber member 7 2nd rubber member 8 Concave-concave fitting part 9 Support member 12,21 Circular pipe

Claims (1)

制振すべき第1部材と第2部材との間に配される防振装置であって、
前記第1部材に一側が取り付けられる筒状の第1ゴム部材と、
前記第2部材に一側が取り付けられ、前記第1ゴム部材とは弾性定数が異なる特性を有する筒状の第2ゴム部材とを備え、
前記第1ゴム部材および前記第2ゴム部材のそれぞれ他側は凹凸嵌合部を有し、
前記第1ゴム部材、前記第2ゴム部材の軸中心側には支持部材が挿通され
前記第1ゴム部材および前記第2ゴム部材の凹凸嵌合部間に、金属材料または樹脂材料からなる部材が嵌合されていることを特徴とする防振装置。
A vibration isolator disposed between the first member and the second member to be damped,
A cylindrical first rubber member having one side attached to the first member;
One side is attached to the second member, and includes a cylindrical second rubber member having a characteristic that the elastic constant is different from that of the first rubber member,
The other side of each of the first rubber member and the second rubber member has an uneven fitting portion,
A support member is inserted through the axial center side of the first rubber member and the second rubber member ,
A vibration isolator comprising a metal material or a resin material fitted between the concave and convex fitting portions of the first rubber member and the second rubber member .
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