JPH06174009A - Vibration control device of structure - Google Patents
Vibration control device of structureInfo
- Publication number
- JPH06174009A JPH06174009A JP32585992A JP32585992A JPH06174009A JP H06174009 A JPH06174009 A JP H06174009A JP 32585992 A JP32585992 A JP 32585992A JP 32585992 A JP32585992 A JP 32585992A JP H06174009 A JPH06174009 A JP H06174009A
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- links
- main
- pair
- main links
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Bridges Or Land Bridges (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば架設中や完成後
の橋梁あるいは建設中の建築物等の構造体の上下振動を
減衰させる制振装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for damping vertical vibration of a structure such as a bridge under construction or after completion or a building under construction.
【０００２】[0002]
【従来の技術】従来、上下振動を減衰させる制振装置と
して図５に示すものがある。これは、橋桁等の構造体１
に取付けられる基台２上に緩衝ばね３を介して重錘４を
配置すると共に、該重錘４と基台２との間にシリンダ装
置５を配設したものであって、該シリンダ装置５により
重錘４を上下動させ、これによって発生する力で構造体
１の振動を打ち消すようになっている。2. Description of the Related Art Conventionally, there is a vibration damping device shown in FIG. 5 for damping vertical vibration. This is a structure 1 such as a bridge girder
A weight 4 is disposed on a base 2 mounted on the base 2 via a buffer spring 3, and a cylinder device 5 is arranged between the weight 4 and the base 2. Thus, the weight 4 is moved up and down, and the force generated thereby cancels the vibration of the structure 1.
【０００３】また、シリンダ装置５が故障した場合に
は、該シリンダ装置５の切換弁（図示せず）を中立状態
にすることにより、構造体１の振動で緩衝ばね３を介し
て重錘４を上下動させ、それによって発生する力で構造
体１の振動を打ち消すようになっており、この制振装置
をアクティブ型からパッシブ型の動吸振器にすることが
できる。When the cylinder device 5 fails, a switching valve (not shown) of the cylinder device 5 is set to a neutral state so that the vibration of the structure 1 causes the weight 4 to pass through the buffer spring 3 through the buffer spring 3. The vibration of the structure 1 is canceled by the force generated by vertically moving the structure, and the vibration damping device can be changed from an active type to a passive type dynamic vibration reducer.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の制振装置で
は、重錘４と緩衝ばね３とからなる装置の系の固有振動
数を構造体１の振動数に合わせることにより、最小の駆
動エネルギーで構造体１の振動を減衰させることができ
るようになっているが、その装置の系の固有振動数を変
えることができないため、例えば、架設中の橋桁のよう
に、架設工事の進行に伴って、固有振動数が変化するも
のに対しては、架設工事の進行に伴って駆動エネルギー
が多大なものとなる。従って、シリンダ装置５として駆
動力の大きなものを用いる必要があり、当然、これによ
って、装置が大型化し、製作費も高くなる。In the conventional vibration damping device described above, the minimum driving energy is obtained by adjusting the natural frequency of the system of the device including the weight 4 and the buffer spring 3 to the frequency of the structure 1. Although it is possible to damp the vibration of the structure 1, it is not possible to change the natural frequency of the system of the device, so that, for example, in the case of a bridge girder during erection, as the erection work progresses. Then, for those whose natural frequency changes, the driving energy becomes large as the erection work progresses. Therefore, it is necessary to use the cylinder device 5 having a large driving force, which naturally increases the size of the device and increases the manufacturing cost.
【０００５】また、シリンダ装置５が故障することによ
り、この制振装置をパッシブ型として利用する場合に
も、装置の系の固有振動数を変えることができないた
め、その装置の系の固有振動数と構造体１の振動数との
マッチングが悪くなり、パッシブ型の動吸振器として機
能しなくなる。Further, due to the failure of the cylinder device 5, even when the vibration damping device is used as a passive type, the natural frequency of the system of the device cannot be changed. Therefore, the natural frequency of the system of the device is not changed. And the frequency of the structure 1 are poorly matched, and the passive dynamic absorber does not function.
【０００６】本発明は、上記従来の問題点に鑑み、構造
体の振動数が変化する場合でも、その振動を最小の駆動
エネルギーで確実に減衰させることができる制振装置を
提供することを目的としている。In view of the above-mentioned conventional problems, it is an object of the present invention to provide a vibration damping device capable of reliably damping the vibration with a minimum drive energy even when the frequency of the structure changes. I am trying.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、構造体に取付けられる基台の上方に、一
端部が互いに回動自在に連結された一対の主リンクと、
該各主リンクの中央部に一端部が回動自在に連結される
と共に、他端部が互いに回動自在に連結された状態で上
記基台に回動自在に支持された一対の補助リンクとから
なる平行四辺形状のリンク機構を設け、上記各主リンク
の他端部を所定時間ごとに同期して互いに逆方向に押し
引きする一対の駆動装置を基台上に配設し、上記各主リ
ンクに重錘をそれぞれ該各主リンクの長手方向移動可能
に取付け、上記両主リンク側と両補助リンク側との間に
緩衝ばねを張設したことを特徴とする。To achieve the above object, the present invention provides a pair of main links, one end of which is rotatably connected to each other, above a base mounted on a structure.
A pair of auxiliary links rotatably supported on the base with one end rotatably connected to the center of each main link and the other end rotatably connected to each other. A parallelogram-shaped link mechanism consisting of a parallelogram, and a pair of drive devices for pushing and pulling the other ends of the main links in opposite directions in synchronization with each other at predetermined intervals are arranged on the base. A weight is attached to each link so as to be movable in the longitudinal direction of each main link, and a buffer spring is stretched between the both main link sides and both auxiliary link sides.
【０００８】[0008]
【作用】上記構成において、構造体に基台を取付け、両
駆動装置を同期駆動することにより、両主リンクを上下
移動させる。これにより、該各主リンクに取付けた重錘
により構造体に上下方向の力が積極的に与えられると共
に、その両重錘の力の方向が構造体の振動の方向と逆方
向に作用し、その構造体の振動を減衰させることができ
る。In the above structure, the base is attached to the structure and both drive devices are synchronously driven to vertically move both main links. As a result, the weight attached to each of the main links positively applies a vertical force to the structure, and the direction of the force of both weights acts in the direction opposite to the vibration direction of the structure, The vibration of the structure can be damped.
【０００９】上記構造体の振動数が変化する場合には、
各重錘を各主リンクの長手方向に沿って適宜移動させる
ことにより、該各重錘と緩衝ばねとからなる装置の系の
固有振動数を構造体の振動数に合うように変更すること
ができ、これによって、最小の駆動エネルギーで構造体
の振動を確実に減衰させることができる。When the frequency of the structure changes,
By appropriately moving each weight along the longitudinal direction of each main link, it is possible to change the natural frequency of the system of the device including each weight and the buffer spring so as to match the frequency of the structure. As a result, the vibration of the structure can be reliably damped with the minimum driving energy.
【００１０】また、駆動装置が故障した場合にも、各重
錘を各主リンクの長手方向に沿って適宜移動させて、該
各重錘と緩衝ばねとからなる装置の系の固有振動数を構
造体の振動数に合うように変更することによって、この
制振装置をアクティブ型からパッシブ型の動吸振器とし
て機能させることができる。Further, even if the drive device fails, each weight is appropriately moved along the longitudinal direction of each main link, and the natural frequency of the system of the device composed of each weight and the buffer spring is changed. By changing the vibration damping device to match the frequency of the structure, the vibration damping device can be made to function as a dynamic vibration absorber of the active type to the passive type.
【００１１】[0011]
【実施例】以下、本発明の一実施例を説明する。図４は
架設中の斜張橋を示すものであって、これは、所定間隔
をおいて立設される橋塔７，７と、、該各橋塔７，７に
支持される橋桁８，８と、該各橋桁８，８と各橋塔７，
７との間に張設されるケーブル９とを主要な構成要素と
しており、この橋桁８，８を水平方向に延設し、最終的
に橋桁８，８どうしを連結することが行われているが、
この架設作業中に、橋桁８，８がその上を移動する作業
機械や風圧等によって起振されやすく、その振動状態を
放置しておくと、共振現象を起こす恐れがあり、非常に
危険であるため、橋桁８，８の先端側に本発明の制振装
置１０，１０を配設している。EXAMPLE An example of the present invention will be described below. FIG. 4 shows a cable-stayed bridge being erected, which includes bridge towers 7 and 7 standing at predetermined intervals, and bridge girders 8 supported by the respective bridge towers 7, 7. 8 and each bridge girder 8, 8 and each bridge tower 7,
The main component is a cable 9 stretched between the bridge girder 7 and the bridge girder 8, and the bridge girders 8 and 8 are extended horizontally to finally connect the bridge girders 8 and 8 to each other. But,
During this erection work, the bridge girders 8 and 8 are easily oscillated by work machines and wind pressures moving on the bridge girders, and if the vibration state is left as it is, a resonance phenomenon may occur, which is extremely dangerous. Therefore, the vibration damping devices 10 and 10 of the present invention are arranged on the tip side of the bridge girders 8 and 8.
【００１２】上記制振装置１０について説明すると、図
１及び図２に示すように、橋桁（構造体）８，８に取付
けられる基台１１の上方に、一端部が連結ピン１２を介
して互いに回動自在に連結された一対の主リンク１３
ａ，１３ｂと、該各主リンク１３ａ，１３ｂの中央部に
連結ピン１４を介して一端部が回動自在に連結されると
共に、他端部が連結ピン１５を介して回動自在に連結さ
れた状態で上記基台１１の固定軸受部１１ａに回動自在
に支持された一対の補助リンク１３ｃ，１３ｄとからな
る平行四辺形状のリンク機構１３を設け、上記各主リン
ク１３ａ，１３ｂの他端部を押し引きするための駆動シ
リンダ装置（駆動装置）１６，１６を基台１１に配設し
ている。なお、上記補助リンク１３ｃ，１３ｄの長さ
は、主リンク１３ａ，１３ｂの長さの半分にされてい
る。The damping device 10 will be described. As shown in FIGS. 1 and 2, one end portions of the damping devices 10 are connected to each other via a connecting pin 12 above a base 11 attached to the bridge girders (structures) 8. A pair of main links 13 rotatably connected
a and 13b and one end of each of the main links 13a and 13b are rotatably connected to each other via a connecting pin 14, and the other end is rotatably connected to each other via a connecting pin 15. In this state, a parallelogram link mechanism 13 including a pair of auxiliary links 13c and 13d rotatably supported by the fixed bearing portion 11a of the base 11 is provided, and the other ends of the main links 13a and 13b are provided. Drive cylinder devices (drive devices) 16 for pushing and pulling the parts are arranged on the base 11. The length of the auxiliary links 13c and 13d is half the length of the main links 13a and 13b.
【００１３】上記駆動シリンダ装置１６，１６には、４
ポート３位置の電磁切換弁１７と、油圧ポンプ１８と、
タンク１９とが付設されており、電磁切換弁１７を図１
に示す中立位置から所定時間ごとに左右に切り換えるこ
とより、該両駆動シリンダ装置１６，１６が同期して駆
動され、主リンク１３ａ，１３ｂが、その他端部を押し
引きされて、上下方向に移動される。The drive cylinder devices 16 and 16 have four
An electromagnetic switching valve 17 at the port 3 position, a hydraulic pump 18,
A tank 19 is additionally provided, and the electromagnetic switching valve 17 is shown in FIG.
By switching from the neutral position shown in to the left and right at predetermined intervals, both drive cylinder devices 16 and 16 are driven in synchronization, and the main links 13a and 13b are pushed and pulled at the other ends to move vertically. To be done.
【００１４】前記主リンク１３ａ，１３ｂの上面には、
図３にも示すように、Ｔ字状のガイド溝２０が形成さ
れ、該ガイド溝２０に移動可能に嵌合する可動台２１に
は、固有振動数変更用の重錘２２，２２が取付けられ、
上記可動台２１に形成したねじ孔に螺合するねじ２３の
先端をガイド溝２０の底面２０ａに圧着させることによ
り、可動台２１を主リンク１３ａ，１３ｂの所定位置に
固定できる。On the upper surfaces of the main links 13a and 13b,
As shown in FIG. 3, a T-shaped guide groove 20 is formed, and weights 22 and 22 for changing the natural frequency are attached to a movable base 21 that is movably fitted in the guide groove 20. ,
The movable base 21 can be fixed to the predetermined positions of the main links 13a and 13b by crimping the tip of the screw 23 screwed into the screw hole formed in the movable base 21 to the bottom surface 20a of the guide groove 20.
【００１５】また両主リンク１３ａ，１３ｂの一端部ど
うしを連結する連結ピン１２に昇降枠２４を取付け、該
昇降枠２４上に大重量の重錘２５を取付けている。更
に、上記昇降枠２４の下端部に設けたピン２６と前記固
定軸受部１１ａの上端部に設けたピン２７との間にリン
ク機構１３を円滑に上下動させるための緩衝ばね２８を
張設している。Further, an elevating frame 24 is attached to a connecting pin 12 connecting one ends of the two main links 13a and 13b, and a heavy weight 25 is attached to the elevating frame 24. Furthermore, a buffer spring 28 for smoothly moving the link mechanism 13 up and down is stretched between a pin 26 provided at the lower end of the elevating frame 24 and a pin 27 provided at the upper end of the fixed bearing portion 11a. ing.
【００１６】上記制振装置１０の作動原理を説明する
と、まず、橋桁８の振動数を設計段階での計算または現
場での加速度計や歪みゲージ等の実測により割り出し、
その割り出された設定値または測定値に基づいて電磁切
換弁１７を制御することにより、両駆動シリンダ装置１
６，１６を同期駆動して、リンク機構１３を上下動させ
る。これにより、各主リンク１３ａ，１３ｂに取付けた
重錘２２，２２，２５により橋桁８に上下方向の力が積
極的に与えられると共に、その重錘２２，２２，２５の
力の方向が橋桁８の振動の方向と逆方向に作用され、橋
桁８の振動を確実に減衰させることができる。The operation principle of the vibration damping device 10 will be described. First, the frequency of the bridge girder 8 is calculated by calculation at the design stage or by actually measuring the accelerometer, strain gauge, or the like at the site.
By controlling the electromagnetic switching valve 17 based on the determined set value or measured value, the double drive cylinder device 1
6 and 16 are synchronously driven to move the link mechanism 13 up and down. As a result, the weights 22, 22, 25 attached to the main links 13a, 13b positively apply a vertical force to the bridge girder 8, and the direction of the force of the weights 22, 22, 25 is increased. The vibration of the bridge girder 8 can be reliably damped by acting in the direction opposite to the direction of the vibration.
【００１７】上記橋桁８の振動数は、架設工事の進行に
伴って変化するが、その振動数の変化に対応して、重錘
２２，２２を各主リンク１３ａ，１３ｂの長手方向に沿
って適宜移動させ、該各重錘２２，２２，２５と緩衝ば
ね２８とからなる装置の系の固有振動数を橋桁８の振動
数に合うように変更するればよい。これによって、最小
の駆動エネルギーで橋桁８の振動を効果的に減衰させる
ことができる。The frequency of the bridge girder 8 changes with the progress of the erection work, and the weights 22, 22 are moved along the longitudinal direction of the main links 13a, 13b in accordance with the change of the frequency. The natural frequency of the system of the apparatus composed of the weights 22, 22, 25 and the buffer spring 28 may be changed appropriately so as to match the frequency of the bridge girder 8. Thereby, the vibration of the bridge girder 8 can be effectively damped with the minimum driving energy.
【００１８】また、両駆動シリンダ装置１６，１６が故
障した場合には、電磁切換弁１７を中立位置にする（図
１参照）と共に、重錘２２，２２を各主リンク１３ａ，
１３ｂの長手方向に沿って適宜移動させることにより、
該各重錘２２，２２，２５と緩衝ばね２８とからなる装
置の系の固有振動数を橋桁８の振動数に合うように変更
し、橋桁８の振動で重錘２２，２２，２５を上下動させ
ればよい。When both drive cylinder devices 16 and 16 fail, the electromagnetic switching valve 17 is set to the neutral position (see FIG. 1) and the weights 22 and 22 are connected to the main links 13a and 13a, respectively.
By appropriately moving along the longitudinal direction of 13b,
The natural frequency of the system of the device composed of the weights 22, 22, 25 and the buffer spring 28 is changed so as to match the frequency of the bridge girder 8, and the weights 22, 22, 25 are moved up and down by the vibration of the bridge girder 8. Just move it.
【００１９】この場合、緩衝ばね２８により、重錘２
２，２２，２５の上下動が持続されると共に、重錘２
２，２２，２５の上下動が橋桁８の振動に対し逆位相に
されるため、橋桁８の振動を確実に減衰させることがで
き、これによって、この制振装置をアクティブ型からパ
ッシブ型の動吸振器として機能させることができる。In this case, the weight of the weight 2 is reduced by the buffer spring 28.
The vertical movement of 2, 22, 25 is continued and the weight 2
Since the vertical movements of 2, 22, and 25 are made opposite in phase to the vibrations of the bridge girder 8, the vibrations of the bridge girder 8 can be reliably damped, which allows the vibration control device to move from the active type to the passive type. It can function as a vibration absorber.
【００２０】上記実施例では、主リンク１３ａ，１３ｂ
上に３個の重錘２２，２２，２５を取付けたが、中央の
重錘２５は省略してもよい。In the above embodiment, the main links 13a and 13b are used.
Although the three weights 22, 22 and 25 are attached to the upper portion, the center weight 25 may be omitted.
【００２１】[0021]
【発明の効果】本発明によれば、駆動装置によりリンク
機構を上下動させるだけで、両主リンクに取付けた各重
錘により構造体に上下方向の力を与えて、その構造体の
振動を減衰させることができ、特に、上記各重錘を各主
リンクの長手方向に沿って適宜移動させて、該各重錘と
緩衝ばねとからなる装置の系の固有振動数を構造体の振
動数に合うように変更することができるため、構造体の
振動を最小の駆動エネルギーで確実に減衰させることが
できる。According to the present invention, by simply moving the link mechanism up and down by the drive device, the weights attached to both main links apply a vertical force to the structure to cause vibration of the structure. It is possible to damp, and in particular, by appropriately moving each of the weights along the longitudinal direction of each main link, the natural frequency of the system of the device composed of each weight and the buffer spring is changed to the vibration frequency of the structure. The vibration of the structure can be reliably damped with the minimum drive energy.
【００２２】また、上記駆動装置が故障した場合には、
各重錘を各主リンクの長手方向に沿って適宜移動させ
て、該各重錘と緩衝ばねとからなる装置の系の固有振動
数を構造体の振動数に合うように変更することにより、
構造体の振動を効果的に減衰させることができる。When the drive device fails,
By appropriately moving each weight along the longitudinal direction of each main link, and changing the natural frequency of the system of the device composed of each weight and the buffer spring to match the frequency of the structure,
The vibration of the structure can be effectively damped.
【００２３】更に、構造が簡単で、故障しにくく、保守
点検も容易に行うことができる。Further, the structure is simple, it does not easily break down, and maintenance and inspection can be easily performed.
【図１】本発明の一実施例である制振装置の一部切り欠
き正面図である。FIG. 1 is a partially cutaway front view of a vibration damping device according to an embodiment of the present invention.
【図２】同平面図である。FIG. 2 is a plan view of the same.
【図３】同要部の横断面図である。FIG. 3 is a cross-sectional view of the main part.
【図４】同制振装置の取付け状態の一例を示す概略説明
図である。FIG. 4 is a schematic explanatory view showing an example of a mounted state of the vibration damping device.
【図５】従来の制振装置の概略正面図である。FIG. 5 is a schematic front view of a conventional vibration damping device.
８ 橋桁（構造体） １０ 制振装置 １１ 基台 １３ リンク機構 １３ａ，１３ｂ 主リンク １３ｃ，１３ｄ 補助リンク １６ 駆動シリンダ装置（駆動装置） ２２ 重錘 ２８ 緩衝ばね 8 bridge girder (structure) 10 damping device 11 base 13 link mechanism 13a, 13b main link 13c, 13d auxiliary link 16 drive cylinder device (drive device) 22 weight 28 buffer spring
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 洋 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Tanaka 5-3-8 Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.
Claims (1)
部が互いに回動自在に連結された一対の主リンクと、該
各主リンクの中央部に一端部が回動自在に連結されると
共に、他端部が互いに回動自在に連結された状態で上記
基台に回動自在に支持された一対の補助リンクとからな
る平行四辺形状のリンク機構を設け、上記各主リンクの
他端部を所定時間ごとに同期して互いに逆方向に押し引
きする一対の駆動装置を基台上に配設し、上記各主リン
クに重錘をそれぞれ該各主リンクの長手方向移動可能に
取付け、上記両主リンク側と両補助リンク側との間に緩
衝ばねを張設したことを特徴とする構造体の制振装置。1. A pair of main links, one end of which is rotatably connected to each other above a base mounted on a structure, and one end of which is rotatably connected to a central portion of each main link. In addition, a parallelogram-shaped link mechanism including a pair of auxiliary links rotatably supported on the base with the other ends rotatably connected to each other is provided. A pair of drive devices that push and pull the end portions in opposite directions in synchronization with each other at a predetermined time are arranged on the base, and a weight is attached to each main link so that each main link can move in the longitudinal direction. A damping device for a structure, wherein a buffer spring is stretched between the main link side and the auxiliary link side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32585992A JPH06174009A (en) | 1992-12-07 | 1992-12-07 | Vibration control device of structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32585992A JPH06174009A (en) | 1992-12-07 | 1992-12-07 | Vibration control device of structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06174009A true JPH06174009A (en) | 1994-06-21 |
Family
ID=18181420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32585992A Pending JPH06174009A (en) | 1992-12-07 | 1992-12-07 | Vibration control device of structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06174009A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003056105A1 (en) * | 2001-12-26 | 2003-07-10 | Nihon University, School Juridical Person | Base isolation device for structure |
| KR100472291B1 (en) * | 2002-10-28 | 2005-03-08 | 한국전력공사 | Friction spring vibration isolation system |
| KR100501358B1 (en) * | 2002-09-17 | 2005-07-18 | 현대자동차주식회사 | Mount device in vehicle |
| JP2006161893A (en) * | 2004-12-03 | 2006-06-22 | Nissan Motor Co Ltd | Shock absorber for vehicle |
-
1992
- 1992-12-07 JP JP32585992A patent/JPH06174009A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003056105A1 (en) * | 2001-12-26 | 2003-07-10 | Nihon University, School Juridical Person | Base isolation device for structure |
| CN1324197C (en) * | 2001-12-26 | 2007-07-04 | 学校法人日本大学 | Damping device for structure |
| US7441376B2 (en) | 2001-12-26 | 2008-10-28 | Nihon University, School Juridical Person | Base isolation device for structure |
| KR100501358B1 (en) * | 2002-09-17 | 2005-07-18 | 현대자동차주식회사 | Mount device in vehicle |
| KR100472291B1 (en) * | 2002-10-28 | 2005-03-08 | 한국전력공사 | Friction spring vibration isolation system |
| JP2006161893A (en) * | 2004-12-03 | 2006-06-22 | Nissan Motor Co Ltd | Shock absorber for vehicle |
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