JPH0333530A - Vibration isolator - Google Patents

Abstract

PURPOSE:To stabilize vibration isolating property by fitting an inside case on either a load carrying platform or a base to be loaded with machinery and an outside case on the other one, and connecting these cases each other through suspension members having small flexural rigidity. CONSTITUTION:A vibration isolator 3 is provided with an outside case 4 having a beam-like member 41 on the upper end part, and an inside case 5 having a beam-like member 51 on the lower end part, and these cases 4, 5 are connected to each other through a series of suspension members 6 respectively engaging with the member 41 of the case 4 and the member 51 of the case 5 and having small flexural rigidity. Further, the beginning end and the ending end of the suspension member 6 are connected to each other with a connecting metal piece 10. Namely, a heavy article placed on a base 1 is loaded on a load carrying platform 2 through the vibration isolator 3. In this case, the base 1 is suspended on the load carrying 2 through six vibration isolators 3. Hereby, the load generated by placing a heavy article 8 is nearly uniformly actuated on the suspension members 6. The natural frequency of this system is independent of the weight of the heavy article, but only dependent on the length lof the member 6, therefore adjustment is easy.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は低周波数振動に対する特性を改良した振動絶縁
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a vibration isolating device with improved characteristics against low frequency vibrations.

（従来の技術） 従来、建築物を地震等の振動を原因とする災害から保護
することや、精密機器を輸送時の路面振動から保護する
ことを目的として、特開昭６３−７２９３６号公報等で
知られる如く第５図、第６図に示すような振動絶縁装置
である。(Prior Art) Conventionally, for the purpose of protecting buildings from disasters caused by vibrations such as earthquakes, and protecting precision equipment from road vibration during transportation, Japanese Patent Application Laid-Open No. 63-72936, etc. This is a vibration isolating device as shown in FIGS. 5 and 6.

この装置は、ベース１と荷台または床面２との間に振動
絶縁装置３が配置されている。この装置は、外側ケース
４と内側ケース５、および両ケースの間を連結する曲げ
剛性の小さい吊り部材６Ａから戒り、外側ケース４はベ
ース１に、内側ケース５は荷台（床面）２に、それぞれ
ボルト７によって固定されている。そして、ベース１上
に精密機器が載置される。In this device, a vibration isolating device 3 is arranged between a base 1 and a loading platform or a floor surface 2. This device uses an outer case 4, an inner case 5, and a hanging member 6A with low bending rigidity that connects both cases. , are fixed by bolts 7, respectively. Then, precision instruments are placed on the base 1.

しかしながら、この従来の装置にあっては、吊材６Ａの
一本一本が独立して設けられているので、特定の吊材６
Ａに過度の待重が作用する恐れがある。However, in this conventional device, each hanging material 6A is provided independently, so a specific hanging material 6A is provided independently.
There is a risk that excessive waiting weight will be applied to A.

このため、吊材６Ａは十分な強度を得るために大きなも
のとする必要がある。これにより、吊材６Ａの曲げ剛性
が大きくなり、振動絶縁性能が悪くなる。Therefore, the hanging material 6A needs to be large in order to obtain sufficient strength. As a result, the bending rigidity of the hanging member 6A increases, and the vibration insulation performance deteriorates.

さらに、この装置を輸送用車両に用いた場合。Furthermore, when this device is used in a transportation vehicle.

スタート時や停止時に発生する低周波数で大変位の振動
を低減できないという問題があり、支持脚と基礎とが衝
突すると被支持物に衝撃力が作用することがある。There is a problem in that it is not possible to reduce low-frequency, large-displacement vibrations that occur when starting or stopping, and when the supporting legs and the foundation collide, an impact force may be applied to the supported object.

（発明が解決しようとする課題） このように、従来の振動絶縁装置においては、吊材が一
本一本独立して設けられていたので、吊材に均一荷重を
作用させることができなかった。(Problem to be solved by the invention) As described above, in the conventional vibration isolating device, each hanging member was provided independently, so it was not possible to apply a uniform load to the hanging members. .

また、この装置を輸送用車両に用いようとすると、スタ
ート時や停止時に発生する低周波数の振動を低減できな
いという問題があり、変位が大きくなり衝突した場合、
機器に衝撃力が作用する。Additionally, when this device is used in transportation vehicles, there is a problem in that it cannot reduce low-frequency vibrations that occur when starting or stopping, and in the event of a collision due to large displacement.
Impact forces act on the equipment.

本発明は上記の点を考慮して威されたもので、安定した
振動絶縁性能を有する振動絶縁装置を提供することを目
的とする。The present invention was developed in consideration of the above points, and an object of the present invention is to provide a vibration isolating device having stable vibration isolating performance.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） 上記目的を達成するために、本発明においては荷台と機
器を積載するベースとの間を交互に系合する曲げ剛性の
小さい一連の吊り部材で連結し、３ さらに荷台とベースとの間に摩擦を利用した減衰要素を
配置している。(Means for Solving the Problems) In order to achieve the above object, in the present invention, a loading platform and a base on which equipment is loaded are connected by a series of hanging members having low bending rigidity that are connected alternately. Furthermore, a damping element using friction is placed between the cargo platform and the base.

（作用） このように構成することにより、吊り部材に均等に荷重
を作用させることができるとともに、低周波数の振動が
作用した場合にも１機器に衝撃力を与えることが無い。(Function) With this configuration, it is possible to apply a load evenly to the hanging members, and even when low frequency vibrations are applied, no impact force is applied to one device.

（実施例） 以下本発明の一実施例を第１図から第３図を参照して説
明する。即ち、重量物と輸送車の荷台（またはフレーム
）２間には振動絶縁装置３と減衰要素３０が装着される
。(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. That is, a vibration isolator 3 and a damping element 30 are installed between the heavy object and the carrier (or frame) 2 of the transport vehicle.

この振動絶縁装置３は上端部にはり状部材４１を有する
外側ケース４と、下端部にはり状部材５１を有する内側
ケース５とを備えている。そして、外側ケース４と内側
ケース５間は、外側ケース４のはり状部材４１と内側ケ
ース５のはり状部材５１に交互に系合する一連の曲げ剛
性の小さい吊部材６で連結する。尚、＋ｉ％り部材６の
始端と終端は、連結金具１０で連結する。即ち、荷台２
上には振動絶縁− 装置３を介して機器８が載置される。This vibration isolating device 3 includes an outer case 4 having a beam-like member 41 at its upper end, and an inner case 5 having a beam-like member 51 at its lower end. The outer case 4 and the inner case 5 are connected by a series of hanging members 6 having low bending rigidity, which are alternately connected to the beam-like members 41 of the outer case 4 and the beam-like members 51 of the inner case 5. The starting end and the ending end of the +i% sliding member 6 are connected by a connecting fitting 10. That is, loading platform 2
A device 8 is placed on top via a vibration isolation device 3.

また、減衰要素３０は、ばねササ上３１．ばね３２、摩
擦部材３３．３４とカバー３５から構成されている。Further, the damping element 30 is arranged on the spring sill 31. It consists of a spring 32, friction members 33, 34 and a cover 35.

ここで、本実施例の構成による作用効果を説明する。本
実施例においては、ベース１を６個の振動絶縁装置３で
荷台２に吊り下げる構成としている。このため、機器８
を載置することにより発生する荷重は、吊り部材６にほ
ぼ均等に作用する。Here, the effects of the configuration of this embodiment will be explained. In this embodiment, the base 1 is suspended from the loading platform 2 by six vibration isolators 3. For this reason, equipment 8
The load generated by placing the hanging member 6 acts almost equally on the hanging member 6.

また、吊り部材の長さを氾、重力加速度をｇとするとこ
の様な系の固有振動数ｆは、次式で表される。Further, assuming that the length of the hanging member is the length of the hanging member and the gravitational acceleration is g, the natural frequency f of such a system is expressed by the following equation.

ｆ　＝　　（１／　２　π）　　・Ｊ　ｇ　／　Ｑ　　
　　　　（１）即ち、系の固有振動数は機器の重量には
依存せず吊り部材６の長さのみによって決まる。従って
、絶縁しようとする振動の周波数から系の固有振動数を
ずらすことが容易にできるという利点がある。f = (1/2 π) ・J g / Q
(1) That is, the natural frequency of the system does not depend on the weight of the equipment and is determined only by the length of the hanging member 6. Therefore, there is an advantage that the natural frequency of the system can be easily shifted from the frequency of the vibration to be isolated.

また、車両のスタート時や停止時に荷台に水平方向の低
周波数の振動が作用した場合、摩擦部材３３、３４がば
ね３２によって即えられているため、これらの静摩擦力
を越えるまではベース１は振動しない。通常、車両のス
ター１〜時や停止時に荷台に発生する低周波数の振動加
速度は０．１または０．２Ｇ程度であるため、この静摩
擦力によって振動を低減することができ、荷台の衝突に
よるＷｒＦ力発生を防ぐことができるという利点がある
。Furthermore, when low-frequency horizontal vibrations act on the loading platform when starting or stopping the vehicle, since the friction members 33 and 34 are held in place by the springs 32, the base 1 will not move until these static friction forces are overcome. Does not vibrate. Normally, the low frequency vibration acceleration that occurs on the loading platform when the vehicle starts or stops is about 0.1 or 0.2G, so this static friction force can reduce the vibration, and the WrF caused by collision of the loading platform. This has the advantage of preventing force generation.

尚、本発明は上記実施例に限定されるものではない。例
えば、第４図に示す如く、振動絶縁装置の中に配置して
も同様の効果が期待できる。Note that the present invention is not limited to the above embodiments. For example, as shown in FIG. 4, the same effect can be expected even if it is placed inside a vibration isolating device.

〔発明の効果〕 以」−説明したように本発明においては、外側ケースの
上端部と内側ケースの下端部を交互に系合する曲げ剛性
の小さい吊り部材で連結し、荷台とベースとの間に摩擦
を利用した減衰要素を配設したので、吊り部材に均等に
荷重が作用させることができ、かつ低周波数の振動が作
用した場合も安定した振動絶縁装置を提供することがで
きる。[Effects of the Invention] As explained above, in the present invention, the upper end of the outer case and the lower end of the inner case are connected by hanging members with low bending rigidity that are connected alternately, and the space between the loading platform and the base is Since a damping element utilizing friction is disposed in the suspension member, a load can be applied evenly to the suspension member, and a stable vibration isolating device can be provided even when low frequency vibrations are applied.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例を示す振動絶縁装置の構成図
、第２図は第１図に示す振動絶縁装置の部分構成図、第
３図は第１図に示す減衰要素の構成図、第４図は本発明
の異なる実施例を示す振動絶縁装置の構成図、第５図は
従来の振動絶縁装置を示す断面図、第６図は従来の振動
絶縁装置＆を示す構ｌ戊図である。。 ｌ・ベース、 ２　・荷台（またはフレーム）、Fig. 1 is a block diagram of a vibration isolating device showing an embodiment of the present invention, Fig. 2 is a partial block diagram of the vibration isolating device shown in Fig. 1, and Fig. 3 is a block diagram of a damping element shown in Fig. 1. , FIG. 4 is a configuration diagram of a vibration isolating device showing a different embodiment of the present invention, FIG. 5 is a sectional view showing a conventional vibration isolating device, and FIG. 6 is a configuration diagram showing a conventional vibration isolating device & It is. . L・Base, 2・Logging platform (or frame),

Claims (1)

【特許請求の範囲】 輸送用車両の荷台等に精密機器を設置する際に、荷台と
機器を積載するベースとの間に配設される振動絶縁装置
において、 荷台と積載を載積するベースのいずれか一方に内側ケー
スを、他方に外側ケースを取付け、これらケース間を曲
げ剛性の小さい吊り部材によって連結し、 さらに荷台とベースとの間に、摩擦を利用した減衰要素
を配設したことを特徴とする振動絶縁装置。[Claims] In a vibration isolating device that is installed between the loading platform and a base on which the equipment is loaded when precision equipment is installed on the loading platform of a transportation vehicle, The inner case is attached to one side and the outer case is attached to the other, and these cases are connected by a hanging member with low bending rigidity. Furthermore, a damping element using friction is installed between the loading platform and the base. Features a vibration isolation device.