JPH05302643A - Floor panel for housing - Google Patents
Floor panel for housingInfo
- Publication number
- JPH05302643A JPH05302643A JP9528192A JP9528192A JPH05302643A JP H05302643 A JPH05302643 A JP H05302643A JP 9528192 A JP9528192 A JP 9528192A JP 9528192 A JP9528192 A JP 9528192A JP H05302643 A JPH05302643 A JP H05302643A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- frame
- floor panel
- vibration
- dynamic vibration
- 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
- Floor Finish (AREA)
- Vibration Prevention Devices (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は人の飛び跳ねや走行など
の衝撃的加振力が加わった際に生じる床パネル面の振動
による床パネルからの放射騒音,振動不快感,家具のガ
タツキ等を防止することを目的とした住宅用床パネルに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention eliminates radiation noise from a floor panel, vibration discomfort, rattling of furniture, etc. due to vibration of the floor panel surface generated when a shocking vibration force such as jumping or running of a person is applied. It relates to a floor panel for a house intended to prevent it.
【0002】[0002]
【従来の技術】従来,床パネルの振動を防止するため
に,床パネルを構成する枠または桟などを木材や制振鋼
板などの内部摩擦の大きな材料で構成していた。2. Description of the Related Art Conventionally, in order to prevent vibration of a floor panel, a frame or a crosspiece constituting the floor panel has been made of a material having a large internal friction such as wood or a damping steel plate.
【0003】[0003]
【発明が解決しようとする課題】ところが上記従来技術
においては,以下に示す不具合があった。 木材を用いた場合,耐久性が悪い上,節等の存在で
品質のバラツキが大きく,品質管理が困難である。ま
た,床パネルの耐荷重基準を満足するために,枠や桟の
剛性を確保する必要から木製枠や木製桟の断面寸法は自
ずと大きくなり,設計及び施工上の制約が多くなる。 通常人間が振動不快感を最も大きく感じるのは31.
5Hz,63Hzの周波数帯域であるが,上記従来の制振鋼
板製機を用いた床パネル振動実験結果(表1)による
と,31.5Hz,63Hzの周波数帯域での振動低減量が
小さく,振動不快感の防止効果が乏しい。However, the above-mentioned prior art has the following problems. When wood is used, the durability is poor, and the quality of the wood varies greatly due to the presence of knots, making quality control difficult. Further, in order to satisfy the load bearing standard of the floor panel, it is necessary to ensure the rigidity of the frame and the crosspiece, so that the cross-sectional dimensions of the wooden frame and the crosspiece naturally increase, and there are many restrictions in design and construction. It is 31.
Although it is in the frequency band of 5Hz and 63Hz, the vibration reduction amount in the frequency band of 31.5Hz and 63Hz is small according to the floor panel vibration test results (Table 1) using the conventional vibration damping steel plate making machine. The effect of preventing discomfort is poor.
【表1】 したがって,本発明は耐久性,品質安定性,設計施工性
に優れ,かつ人の飛び跳ねや走行など衝撃的加振力が加
わった際に生じる床パネル面の振動による床パネルの放
射騒音,振動不快感,家具のガタツキ等を防止する住宅
用床パネルを提供することを目的としてなされたもので
ある。[Table 1] Therefore, the present invention is excellent in durability, quality stability, design workability, and radiated noise and vibration non-existence of the floor panel due to vibration of the floor panel surface generated when a shocking excitation force such as jumping or running of a person is applied. The purpose of the invention is to provide a floor panel for a house that prevents a pleasant feeling and rattling of furniture.
【0004】[0004]
【課題を解決するための手段】上記目的を達成するめに
本発明は,矩形の鋼製枠に鋼製桟を架設して形成した枠
体に面材が取り付けられ,複数の板バネを,粘弾性体又
は粘性体により層状に接合すると共に端部に錘を取り付
けた動吸振器を鋼製枠又は/及び鋼製桟に固定した住宅
用床パネルとして構成されている。In order to achieve the above object, according to the present invention, a face material is attached to a frame body formed by erection of steel bars on a rectangular steel frame, and a plurality of leaf springs are attached. It is configured as a floor panel for a house in which a dynamic vibration absorber joined to each other in layers by an elastic body or a viscous body and having a weight attached to an end thereof is fixed to a steel frame or / and a steel crosspiece.
【0005】[0005]
【作用】人の飛び跳ねや走行など衝撃的加振力が床パネ
ル面材に加わった際,上記枠体と面材とが一体となって
自由振動を開始するが,鋼製枠又は/及び鋼製桟の振動
によって動吸振器の板バネ等が共振振動し,同共振振動
による板バネの変化に伴う上記粘弾性体の剪断変形によ
り,鋼製枠,鋼製桟の振動エネルギーが熱エネルギーに
変換されて,大気中に放出され,鋼製枠又は/及び鋼製
桟,ひいては,床パネルの振動が抑制される。尚,動吸
振器の固有振動数fは次式により設定される。[Function] When a shocking vibration force such as a person jumping or running is applied to the floor panel face material, the frame body and the face material integrally start free vibration. The leaf spring of the dynamic vibration absorber resonates due to the vibration of the bar, and the shear deformation of the viscoelastic body accompanying the change of the leaf spring due to the resonance vibration causes the vibration energy of the steel frame and the bar to become thermal energy. It is converted and released into the atmosphere, and vibrations of the steel frame and / or steel bars and thus the floor panel are suppressed. The natural frequency f of the dynamic vibration absorber is set by the following equation.
【数1】 K:板バネのバネ定数 m:錘の質量 この固有振動数f床パネル振動で最も振動不快感の高い
31.5Hz,63Hzの周波数帯域に調整することによ
り,従来技術では達成できなかった振動低減効果を十分
に発揮させることができ,床パネル振動による床パネル
放射騒音,振動不快感,家具のガタツキ等を防止するこ
とができる。また,動吸振器の板バネおよび錘の幅が,
鋼製枠,鋼製桟のフランジの出幅より大きくならないよ
うにすることにより,鋼製枠および鋼製桟に予め動吸振
器を取り付けておいても,上記動吸振器が矩形の枠体を
形成する際の障害物とならないので,従来の床パネル製
造工程に特別な改良を加える必要がなくなり,製造コス
トを最小限にとどめることができる。さらに,上記枠体
に面材を取り付けた後,面材に断熱材などを貼り付ける
場合でも,上記動吸振器が障害物となることはない。こ
の発明に係る住宅用床パネルは,枠及び桟が鋼製である
ために,従来の木製パネルに比べて耐久性,品質安定性
に優れ,かつ剛性が大きいため断面寸法を小さくするこ
とができることから軽量化,設計施工性の向上,製造コ
ストの削減が期待される。又,この発明に係る住宅用床
パネルは,構成,寸法,建物本体への取付法を標準化す
ることにより固有振動数が同一となり,予めこれに適合
した動吸振器を鋼製枠又は/及び鋼製桟に取付けること
ができる。[Equation 1] K: Spring constant of leaf spring m: Mass of weight f This natural frequency f The vibration reduction that could not be achieved by the conventional technology by adjusting to the frequency band of 31.5Hz and 63Hz, which is the most vibration uncomfortable with floor panel vibration. The effect can be fully exhibited, and floor panel radiation noise due to floor panel vibration, vibration discomfort, and rattling of furniture can be prevented. Also, the width of the leaf spring and the weight of the dynamic vibration absorber is
Even if the dynamic vibration absorber is attached to the steel frame and the steel crosspiece in advance, the rectangular frame body will not be attached to the steel frame and the steel crosspiece by making the width not larger than the projecting width of the flange of the steel frame and the steel crosspiece. Since it does not become an obstacle when forming, there is no need to add special improvements to the conventional floor panel manufacturing process, and the manufacturing cost can be minimized. Furthermore, even if a heat insulating material or the like is attached to the face material after attaching the face material to the frame body, the dynamic vibration absorber does not become an obstacle. The floor panel for a house according to the present invention is excellent in durability and quality stability as compared with the conventional wooden panel because the frame and the crosspiece are made of steel, and the rigidity is large, so that the cross-sectional dimension can be reduced. Therefore, weight reduction, improvement of design workability, and reduction of manufacturing cost are expected. Further, in the floor panel for a house according to the present invention, the natural frequency becomes the same by standardizing the configuration, dimensions, and mounting method to the building body, and a dynamic vibration absorber adapted to this in advance is made into a steel frame or / and a steel frame. Can be attached to a bar.
【0006】[0006]
【実施例】以下,添付図面を参照して,本発明を具体化
した実施例につき説明し,本発明の理解に供する。尚,
以下の実施例は本発明を具体化した一例であって,本発
明の技術的範囲を限定する性格のものではない。ここに
図1は本発明の一実施例に係る住宅用床パネルの斜視
図,図2は同床パネルへの動吸振器の取付状態を示す斜
視図,図3は上記動吸振器の一例を示す断面図,図4は
上記床パネルの振動形態の一例を示す模式図である。こ
の実施例にかかる住宅用床パネルPでは,図1に示す如
く断面が溝型の鋼材で枠1および桟2が形成され,上記
鋼製枠1に複数の上記鋼製桟2を架設して形成した枠体
に木製の面材4が取り付けられており,図2に示す動吸
振器9が桟2のフランジ内に取り付けられている。この
動吸振器9は図3に示す如く支持部5から左右両方向へ
互いに平行に2枚の板バネ6を突設し,上記平行の板バ
ネ6を,粘弾性体または粘性体7を介して接合し,さら
に上記層状に接合された板バネ6の自由端側にそれぞれ
錘8を取り付け,上記板バネ6,粘弾性樹脂7,および
錘8を上記支持部5を中心として左右対称に配置して構
成され,図4の◎印で示される上記桟2の位置のフラン
ジの内側に取り付けボルト10を介して設置されてい
る。図4の◎印は振幅最大の位置であり,この位置に動
吸振器を取り付けると最も良く共振するので動吸振器の
振動吸収効果が最大になる。図5は,上記実施例の住宅
用床パネルの振動レベル測定値と,上記動吸振器を組込
まない場合の住宅用パネルの振動レベルの測定値を示
し,最大10デシベルの振動低減効果が実測された。上
記動吸振器は鋼製桟以外に鋼製枠にも取り付けることが
できる。鋼製桟や鋼製枠の断面形状は上記溝形のみでな
くH字状であってもよい。また板バネは2枚に限らず複
数であればよい。板バネ間に挟む粘弾性体としては酢酸
ビニル系樹脂,高減衰シリコンラバー,ポリオレフィン
系樹脂等を用い,又これは粘性体に置き換えることがで
きる。Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. still,
The following examples are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention. FIG. 1 is a perspective view of a floor panel for a house according to an embodiment of the present invention, FIG. 2 is a perspective view showing a mounting state of a dynamic vibration reducer on the floor panel, and FIG. 3 is an example of the dynamic vibration reducer. FIG. 4 is a schematic view showing an example of the vibration mode of the floor panel. In the floor panel P for a house according to this embodiment, as shown in FIG. 1, a frame 1 and a crosspiece 2 are formed of a steel material having a groove-shaped cross section, and a plurality of the above-mentioned steel crosspieces 2 are installed on the steel frame 1. A wooden face member 4 is attached to the formed frame body, and a dynamic vibration reducer 9 shown in FIG. 2 is attached inside the flange of the crosspiece 2. As shown in FIG. 3, the dynamic vibration reducer 9 has two leaf springs 6 projecting parallel to each other from the supporting portion 5 in the left and right directions, and the parallel leaf springs 6 are interposed via a viscoelastic body or a viscous body 7. Weights 8 are attached to the free ends of the leaf springs 6 which are joined together, and the leaf springs 6, the viscoelastic resin 7, and the weights 8 are arranged symmetrically about the support portion 5 as a center. 4 and is installed inside the flange at the position of the crosspiece 2 shown by a double circle mark in FIG. 4 via a mounting bolt 10. The ⊚ mark in Fig. 4 is the position where the amplitude is maximum, and when the dynamic vibration absorber is attached at this position, the resonance is best, so the vibration absorption effect of the dynamic vibration absorber is maximized. FIG. 5 shows the measured values of the vibration level of the floor panel for a house of the above-described embodiment and the measured values of the vibration level of the panel for a house when the dynamic vibration absorber is not incorporated, and the vibration reduction effect of up to 10 decibels was actually measured. It was The above-described dynamic vibration absorber can be attached to a steel frame as well as a steel bar. The cross-sectional shape of the steel crosspiece and the steel frame may be not only the above groove shape but also an H shape. Further, the number of leaf springs is not limited to two and may be plural. As the viscoelastic body sandwiched between the leaf springs, vinyl acetate resin, high-damping silicone rubber, polyolefin resin, etc. are used, and this can be replaced with a viscous body.
【0007】[0007]
【発明の効果】子供等の人の飛び跳ねや走行など衝撃的
加振力が面材に加わった際,面材と鋼製枠,鋼製桟とは
一体となって振動する。したがって,図4の◎印の鋼製
桟や鋼製枠のフランジの内側に取り付けられた上記動吸
振器の支持部も一体となって振動する。ところが,板バ
ネ,粘弾性体又は粘性体と錘からなる振動系の固有振動
数が上記面材,枠および桟からなる床パネルの固有振動
数と等しく設定されている場合,床パネルの振動エネル
ギが動吸振器へ移動する。さらに複数の板バネが相対的
に変位して粘弾性体又は粘性体にせん断変形が生じるの
で,動吸振器に移動してきた振動エネルギが粘弾性体又
は粘性体において熱エネルギに変換され大気に放出され
る。その結果として,上記床パネルは耐久性,品質安定
性,施工性に優れ,かつ人の飛び跳ねや走行など衝撃的
加振動力が加わった際に生じる床パネル面の振動による
振動音,振動不快感,家具のガタツキ等を防止すること
ができる。[Effects of the Invention] When a shocking vibration force such as jumping or running of a person such as a child is applied to the face material, the face material, the steel frame and the steel crosspiece vibrate together. Therefore, the supporting portion of the dynamic vibration reducer attached inside the steel crosspiece and the flange of the steel frame indicated by ⊚ in FIG. 4 also vibrates integrally. However, if the natural frequency of the vibration system consisting of leaf springs, viscoelastic bodies or viscous bodies and weights is set to be equal to the natural frequency of the floor panel consisting of the above face material, frame and crosspiece, the vibration energy of the floor panel Moves to the dynamic vibration absorber. Further, since multiple leaf springs are relatively displaced and shear deformation occurs in the viscoelastic body or viscous body, the vibration energy that has moved to the dynamic vibration absorber is converted into heat energy in the viscoelastic body or viscous body and released to the atmosphere. To be done. As a result, the floor panel has excellent durability, quality stability, and workability, and vibration noise and vibration discomfort caused by vibration of the floor panel surface generated when a shocking vibration force is applied such as jumping or running of a person. , It is possible to prevent rattling of furniture.
【図1】 本発明の一実施例に係る住宅用床パネルの斜
視図。FIG. 1 is a perspective view of a floor panel for a house according to an embodiment of the present invention.
【図2】 同床パネルへの動吸振器の取付状態を示す斜
視図。FIG. 2 is a perspective view showing a state where the dynamic vibration reducer is attached to the floor panel.
【図3】 上記動吸振器の一例を示す断面図。FIG. 3 is a cross-sectional view showing an example of the dynamic vibration reducer.
【図4】 上記床パネルの振動形態の一例を示す模式
図。FIG. 4 is a schematic diagram showing an example of a vibration mode of the floor panel.
【図5】 実施例構造の効果を示すグラフ。FIG. 5 is a graph showing the effect of the structure of the example.
P…床パネル 1…鋼製枠 2…鋼製桟 4…面材 5…支持部 6…板バネ 7…(粘弾性樹脂)粘弾性体 8…錘 9…動吸振器 P ... Floor panel 1 ... Steel frame 2 ... Steel crosspiece 4 ... Face material 5 ... Support part 6 ... Leaf spring 7 ... (Viscoelastic resin) Viscoelastic body 8 ... Weight 9 ... Dynamic vibration absorber
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宇津野 秀夫 神戸市西区高塚台1丁目5番5号 株式会 社神戸製鋼所神戸総合技術研究所内 (72)発明者 小林 章 加古川市金沢町1番地 株式会社神戸製鋼 所加古川製鉄所内 (72)発明者 藤原 治生 神戸市中央区脇浜町1丁目3番18号 株式 会社神戸製鋼所神戸本社内 (72)発明者 越智 修平 豊中市新千里西町1丁目1番12号 ナショ ナル住宅産業株式会社内 (72)発明者 村井 達郎 豊中市新千里西町1丁目1番12号 ナショ ナル住宅産業株式会社内 (72)発明者 河田 稔 豊中市新千里西町1丁目1番12号 ナショ ナル住宅産業株式会社内 (72)発明者 中村 宮雄 豊中市新千里西町1丁目1番12号 ナショ ナル住宅産業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Utsuno 1-5-5 Takatsukadai, Nishi-ku, Kobe City Stock Company Kobe Steel Research Institute, Kobe Research Institute (72) Inventor Akira Kobayashi 1 Kanazawa-cho, Kakogawa-shi Shares Company Kobe Steel Works, Kakogawa Steel Works (72) Inventor Haruo Fujiwara 1-318 Wakihama-cho, Chuo-ku, Kobe Stock Company Kobe Steel Works Kobe Head Office (72) Inventor Shuhei Ochi 1-1 Senshin Nishimachi, Toyonaka City No. 12 National Housing Industry Co., Ltd. (72) Inventor Tatsuro Murai 1-1-12 Shinsenri Nishimachi, Toyonaka City No. 12 National Housing Industry Co., Ltd. (72) Minoru Kawada 1 1-1 Shinsenri Nishimachi, Toyonaka City No. 12 National Housing Industry Co., Ltd. (72) Inventor Miyao Nakamura 1-1-12 Shinsenri Nishimachi, Toyonaka City National Housing Products Business
Claims (7)
た枠体に面材が取り付けられ,複数の板バネを,粘弾性
体又は粘性体により層状に接合すると共に端部に錘を取
り付けた動吸振器を鋼製枠又は/及び鋼製桟に固定した
住宅用床パネル。1. A face member is attached to a frame body formed by arranging steel bars on a rectangular steel frame, and a plurality of leaf springs are joined in layers by a viscoelastic body or a viscous body, and at the ends thereof. A floor panel for a house in which a dynamic vibration absorber with a weight is fixed to a steel frame and / or steel crosspiece.
H字型状の鋼材で形成され,動吸振器が鋼製枠,鋼製桟
の内側に配置された請求項1記載の住宅用床パネル。2. The steel frame and the steel crosspiece are formed of a steel material having a groove or H-shaped cross section, and the dynamic vibration absorber is arranged inside the steel frame and the steel crosspiece. Residential floor panels.
桟のフランジの出幅より大きくない請求項1記載の住宅
用床パネル。3. The floor panel for a house according to claim 1, wherein the width of the leaf spring of the dynamic vibration absorber is not larger than the protruding width of the flange of the steel frame and the steel bar.
固定された請求項1記載の住宅用床パネル。4. The floor panel for a house according to claim 1, wherein the dynamic vibration absorber is fixed to a flange of a steel frame and a steel bar.
近傍に動吸振器を固定した請求項1記載の住宅用床パネ
ル。5. The floor panel for a house according to claim 1, wherein a dynamic vibration absorber is fixed in the vicinity of a position where the maximum amplitude is exhibited due to its characteristic vibration characteristic.
振動数が,ほぼ等しい請求項1記載の住宅用床パネル。6. The floor panel for a house according to claim 1, wherein the natural frequency of the dynamic vibration absorber and the natural frequency of the floor panel are substantially equal to each other.
は63Hz近傍の周波数帯域である請求項1記載の住宅用
床パネル。7. The floor panel for a house according to claim 1, wherein the natural frequency of the dynamic vibration absorber is in a frequency band near 31.5 Hz or 63 Hz.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9528192A JPH05302643A (en) | 1992-04-15 | 1992-04-15 | Floor panel for housing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9528192A JPH05302643A (en) | 1992-04-15 | 1992-04-15 | Floor panel for housing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05302643A true JPH05302643A (en) | 1993-11-16 |
Family
ID=14133394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9528192A Pending JPH05302643A (en) | 1992-04-15 | 1992-04-15 | Floor panel for housing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05302643A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005351366A (en) * | 2004-06-10 | 2005-12-22 | Komai Tekko Kk | Plate spring type dynamic vibration damper |
JP2006028845A (en) * | 2004-07-14 | 2006-02-02 | Tokai Rubber Ind Ltd | Floor structure |
JP2006037399A (en) * | 2004-07-23 | 2006-02-09 | Tokai Rubber Ind Ltd | Floor structure |
JP2006070494A (en) * | 2004-08-31 | 2006-03-16 | Tokai Rubber Ind Ltd | Floor structure |
JP2008157427A (en) * | 2006-12-26 | 2008-07-10 | Toyota Motor Corp | Vibration suppressing structure |
JP2009035864A (en) * | 2007-07-31 | 2009-02-19 | Tokai Rubber Ind Ltd | Vibration control device of building structure |
JP2010174987A (en) * | 2009-01-29 | 2010-08-12 | Mitsubishi Heavy Ind Ltd | Vibration control device and great wheel |
JP2013170698A (en) * | 2012-02-23 | 2013-09-02 | Asahi Kasei Homes Co | Vibration damping device and building |
WO2021230069A1 (en) * | 2020-05-12 | 2021-11-18 | Nok株式会社 | Vibration damper, vibration damping apparatus, mounting method of vibration damper, and vibration damping method |
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JPS62233537A (en) * | 1986-04-03 | 1987-10-13 | Kazuto Sedo | Vibration suppressing method for structure |
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JPS6242654B2 (en) * | 1974-07-22 | 1987-09-09 | Standard Oil Co Ohio | |
JPS55107143A (en) * | 1979-02-10 | 1980-08-16 | Ohbayashigumi Ltd | Vibration proof device |
JPS62233537A (en) * | 1986-04-03 | 1987-10-13 | Kazuto Sedo | Vibration suppressing method for structure |
JPH03100244A (en) * | 1989-09-13 | 1991-04-25 | Toda Constr Co Ltd | Vibrationproof device for floor vibration |
Cited By (11)
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---|---|---|---|---|
JP2005351366A (en) * | 2004-06-10 | 2005-12-22 | Komai Tekko Kk | Plate spring type dynamic vibration damper |
JP2006028845A (en) * | 2004-07-14 | 2006-02-02 | Tokai Rubber Ind Ltd | Floor structure |
JP2006037399A (en) * | 2004-07-23 | 2006-02-09 | Tokai Rubber Ind Ltd | Floor structure |
JP2006070494A (en) * | 2004-08-31 | 2006-03-16 | Tokai Rubber Ind Ltd | Floor structure |
JP2008157427A (en) * | 2006-12-26 | 2008-07-10 | Toyota Motor Corp | Vibration suppressing structure |
JP2009035864A (en) * | 2007-07-31 | 2009-02-19 | Tokai Rubber Ind Ltd | Vibration control device of building structure |
JP2010174987A (en) * | 2009-01-29 | 2010-08-12 | Mitsubishi Heavy Ind Ltd | Vibration control device and great wheel |
JP2013170698A (en) * | 2012-02-23 | 2013-09-02 | Asahi Kasei Homes Co | Vibration damping device and building |
WO2021230069A1 (en) * | 2020-05-12 | 2021-11-18 | Nok株式会社 | Vibration damper, vibration damping apparatus, mounting method of vibration damper, and vibration damping method |
JPWO2021230069A1 (en) * | 2020-05-12 | 2021-11-18 | ||
CN114761702A (en) * | 2020-05-12 | 2022-07-15 | Nok株式会社 | Vibration damper, vibration damping device, method for mounting vibration damper, and method for damping vibration |
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