JP3391131B2 - Measuring method and measuring device for static imbalance of sphere - Google Patents
Measuring method and measuring device for static imbalance of sphereInfo
- Publication number
- JP3391131B2 JP3391131B2 JP00046295A JP46295A JP3391131B2 JP 3391131 B2 JP3391131 B2 JP 3391131B2 JP 00046295 A JP00046295 A JP 00046295A JP 46295 A JP46295 A JP 46295A JP 3391131 B2 JP3391131 B2 JP 3391131B2
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- Prior art keywords
- sphere
- static imbalance
- measuring
- gas bearing
- imbalance
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Description
【０００１】[0001]
【産業上の利用分野】この発明に係る球の静的不釣り合
いの測定方法と測定装置は、例えば玉軸受を構成する玉
の様に、球の静的不釣り合いを測定する為に利用する。BACKGROUND OF THE INVENTION The measuring method and apparatus for measuring the static imbalance of a ball according to the present invention is used for measuring the static imbalance of a ball, such as a ball constituting a ball bearing.
【０００２】[0002]
【従来の技術】玉軸受用の玉等、球の静的不釣り合いを
正確に測定する事は、高速回転部分を支承する玉軸受に
十分な性能を発揮させる為に必要である。この様な目的
で球の静的不釣り合いを測定する測定装置として従来か
ら、特公昭４９−２７３０９号公報に記載された構造が
記載されている。図２〜３は、この公報に記載された測
定装置を示している。2. Description of the Related Art Accurate measurement of the static imbalance of balls, such as balls for ball bearings, is necessary for the ball bearings supporting the high-speed rotating portion to exhibit sufficient performance. As a measuring device for measuring the static imbalance of a sphere for such a purpose, the structure disclosed in Japanese Patent Publication No. 49-27309 has been disclosed. 2 to 3 show the measuring device described in this publication.
【０００３】この測定装置は、気体軸受１とノズル２と
を有する。このうちの気体軸受１は、上方が開口した球
状凹面３を有し、この球状凹面３の内側に静的不釣り合
いを測定すべき球４を回転自在に支承する。又、上記ノ
ズル２は、上記気体軸受１に支承された球４に圧力気体
を吹き付けて、この球４を自転させる。This measuring device has a gas bearing 1 and a nozzle 2. The gas bearing 1 has a spherical concave surface 3 whose upper side is open, and a spherical ball 4 whose static imbalance is to be measured is rotatably supported inside the spherical concave surface 3. Further, the nozzle 2 blows a pressure gas onto the ball 4 supported by the gas bearing 1 to rotate the ball 4 on its own axis.
【０００４】この様な測定装置を用いて球４の静的不釣
り合いを測定するには、上記気体軸受１により球４を浮
上支持した状態で、上記ノズル２から瞬間的に圧縮空気
を噴出させ、球４を揺動させる。そして、上記気体軸受
１の支持力を保持したまま、上記ノズル２からの圧縮空
気噴出を停止させる。この結果、上記球４は静的不釣り
合いに基づいて揺動運動を発生するので、この揺動運動
の周期を求める。この揺動運動の周期は、上記静的不釣
り合いにより定まるので上記揺動運動の周期を求めれ
ば、球４の静的不釣り合いを算定できる。In order to measure the static imbalance of the sphere 4 using such a measuring device, compressed air is momentarily ejected from the nozzle 2 while the sphere 4 is supported by the gas bearing 1 in a floating manner. , Swing the ball 4. Then, the ejection of compressed air from the nozzle 2 is stopped while the supporting force of the gas bearing 1 is maintained. As a result, the sphere 4 generates a swinging motion based on static imbalance, so the period of this swinging motion is obtained. Since the cycle of the swinging motion is determined by the static imbalance, the static imbalance of the sphere 4 can be calculated by obtaining the cycle of the swinging motion.
【０００５】[0005]
【発明が解決しようとする課題】上述の様にして球４の
静的不釣り合いを求める場合には、球４の外周面と球状
凹面３の内周面との間の隙間部分での空気の流れが均一
でなければならない。ところが、球４が揺動運動をする
状態で上記空気の流れを完全に均一にする事は難しく、
この結果、上記球４の揺動運動に、静的不釣り合い以外
の要素が入り込む場合がある。この結果、上述した従来
装置による静的不釣り合いの測定は、必ずしも正確に行
なわれない場合がある。本発明の球の静的不釣り合いの
測定方法と測定装置は、この様な事情に鑑みて発明した
ものである。When the static imbalance of the sphere 4 is obtained as described above, the air in the gap between the outer peripheral surface of the sphere 4 and the inner peripheral surface of the spherical concave surface 3 is removed. The flow should be uniform. However, it is difficult to make the air flow completely uniform while the sphere 4 is swinging,
As a result, elements other than the static imbalance may enter the swinging movement of the ball 4. As a result, the static imbalance measurement by the conventional device described above may not always be performed accurately. The static imbalance measuring method and measuring apparatus of the present invention were invented in view of such circumstances.
【０００６】[0006]
【課題を解決するための手段】本発明の球の静的不釣り
合いの測定方法と測定装置のうち、請求項１に記載した
球の静的不釣り合いの測定方法は、球に互いに直交する
第一、第二、第三の３本の自転軸を設定し、これら３本
の自転軸毎に上記球を自転させつつ、自転速度及び静的
不釣り合いにより発生する遠心力を測定して、上記３本
の自転軸毎に上記自転速度及び遠心力に関する測定結果
を求める。そして、これら３種類の測定結果に基づいて
上記球の静的不釣り合いを算定する。In the method and apparatus for measuring static imbalance of a sphere according to the present invention, the method for measuring static imbalance of a sphere according to claim 1 is characterized in that The first, second, and third three rotation axes are set, and while rotating the sphere for each of these three rotation axes, the rotation speed and the centrifugal force generated by the static imbalance are measured, and The measurement results regarding the rotation speed and the centrifugal force are obtained for each of the three rotation axes. Then, the static imbalance of the sphere is calculated based on the measurement results of these three types.
【０００７】又、請求項２に記載した球の静的不釣り合
いの測定装置は、上方が開口した球状凹面を有し、この
球状凹面の内側に球を回転自在に支承する気体軸受と、
この気体軸受に加わるスラスト荷重を測定する荷重測定
センサと、上記気体軸受に支承された球に圧力気体を吹
き付けてこの球を自転させるノズルと、上記荷重測定セ
ンサの出力信号に基づいて上記球の自転速度及び遠心力
を求めるのに必要な測定値を得る為の電気回路とを備え
る。Further, the static imbalance measuring device for a sphere according to claim 2 has a spherical concave surface having an upper opening, and a gas bearing for rotatably supporting the sphere inside the spherical concave surface,
A load measuring sensor for measuring a thrust load applied to the gas bearing, a nozzle for blowing pressurized gas onto a sphere supported by the gas bearing to rotate the sphere, and a sphere of the sphere based on an output signal of the load measuring sensor. And an electric circuit for obtaining measurement values necessary for obtaining the rotation speed and the centrifugal force.
【０００８】[0008]
【作用】本発明の球の静的不釣り合いの測定方法と測定
装置の場合には、球を定常回転させたままの状態で、静
的不釣り合いに基づいて発生する遠心力を、気体軸受に
加わるスラスト荷重として測定する。従って、球を揺動
運動させる場合に比べて、測定時に球状凹面の内周面と
球の外周面との間の隙間部分での空気の流れの影響を軽
減できる。この為、上記遠心力（スラスト荷重）を、静
的不釣り合い以外の要素に影響される事なく正確に測定
できて、静的不釣り合いを正確に求める事ができる。In the method and apparatus for measuring the static imbalance of the sphere of the present invention, the centrifugal force generated based on the static imbalance is applied to the gas bearing in the state where the sphere is constantly rotated. Measure as the applied thrust load. Therefore, the influence of the air flow in the gap portion between the inner peripheral surface of the spherical concave surface and the outer peripheral surface of the sphere at the time of measurement can be reduced as compared with the case of swinging the sphere. Therefore, the centrifugal force (thrust load) can be accurately measured without being affected by factors other than the static imbalance, and the static imbalance can be accurately obtained.
【０００９】[0009]
【実施例】図１は、本発明の静的不釣り合いの測定装置
の実施例を示している。基台５の上面には気体軸受６
が、圧電素子等の荷重変換器７を介して支持されてい
る。この荷重変換器７は円環状に形成して、その内側に
後述する圧縮空気を流通自在としている。又、上記基台
５は十分な重量を有する。これは、上記荷重変換器７へ
の入力が気体軸受６の側からのみ行なわれ、基台５の側
からノイズが入り込まない様にする為である。尚、上記
荷重変換器７の検出信号は、アンプ１８で増幅し、メー
タ１９で表示する。FIG. 1 shows an embodiment of the static imbalance measuring device of the present invention. A gas bearing 6 is provided on the upper surface of the base 5.
Are supported via a load converter 7 such as a piezoelectric element. The load converter 7 is formed in an annular shape, and compressed air, which will be described later, can freely flow inside the load converter 7. The base 5 has a sufficient weight. This is because the input to the load converter 7 is performed only from the gas bearing 6 side so that noise does not enter from the base 5 side. The detection signal of the load converter 7 is amplified by the amplifier 18 and displayed by the meter 19.
【００１０】上記気体軸受６は、底板８と周板９とから
成る有底円筒状のケース１０の内側に多孔質材１１を嵌
装して成る。この多孔質材１１の上面には、上方が開口
した球状凹面１２を設けている。この球状凹面１２の内
径は、静的不釣り合いを測定すべき球４の外径よりも僅
かに大きくしている。又、上記底板８及び上記基台５の
内側には給気孔１３ａ、１３ｂを設け、これら両給気孔
１３ａ、１３ｂと上記荷重変換器７の内側とを通じて、
上記ケース１０の内側を、コンプレッサ等の圧縮空気源
１４に通じさせている。この圧縮空気源１４から上記給
気孔１３ａ、１３ｂ及び荷重変換器７の内側を通じて上
記ケース１０内に送り込まれた圧縮空気は、上記球状凹
面１２の内面から吹き出して上記球４を浮上させ、この
球４を回転自在に支持する。The gas bearing 6 is formed by fitting a porous material 11 inside a bottomed cylindrical case 10 composed of a bottom plate 8 and a peripheral plate 9. On the upper surface of the porous material 11, there is provided a spherical concave surface 12 having an opening at the top. The inner diameter of the spherical concave surface 12 is slightly larger than the outer diameter of the sphere 4 whose static imbalance is to be measured. Further, air supply holes 13a and 13b are provided inside the bottom plate 8 and the base 5, and through both air supply holes 13a and 13b and the inside of the load converter 7,
The inside of the case 10 is communicated with a compressed air source 14 such as a compressor. The compressed air sent from the compressed air source 14 into the case 10 through the air supply holes 13a and 13b and the inside of the load converter 7 blows out from the inner surface of the spherical concave surface 12 to levitate the sphere 4 , 4 is rotatably supported.
【００１１】又、上記気体軸受６の上方には、圧縮空気
を噴出する為のノズル１５を設けている。このノズル１
５の開口は、上記気体軸受６の直径方向内方に向いてい
る。このノズル１５に圧縮空気を供給する為の給気管１
６の途中には弁１７を設け、この弁１７の開放に伴って
上記ノズル１５から上記球４の頂部に圧縮空気を、この
球４に吹き付ける様にしている。この様にして上記気体
軸受６の球状凹面１２に支承された球４に圧縮空気を吹
き付けると、この球４は、上記圧縮空気の噴出方向に対
し（平面的に見た場合に）直角方向に位置する自転軸を
中心に自転する。A nozzle 15 for ejecting compressed air is provided above the gas bearing 6. This nozzle 1
The opening 5 faces inward in the diametrical direction of the gas bearing 6. Air supply pipe 1 for supplying compressed air to this nozzle 15.
A valve 17 is provided in the middle of 6, and when the valve 17 is opened, compressed air is blown from the nozzle 15 to the top of the ball 4 to the ball 4. When compressed air is blown onto the sphere 4 supported by the spherical concave surface 12 of the gas bearing 6 in this manner, the sphere 4 is perpendicular to the jet direction of the compressed air (when viewed in plan). It rotates about the rotation axis.
【００１２】上述の様に構成される測定装置により、球
４の静的不釣り合いを測定する場合、次の様にして行な
う。先ず、球４の中心で互いに直交するｘ，ｙ，ｚ軸
（第一、第二、第三の３本の自転軸）を想定し、球４の
表面でｘ軸上位置にｘ軸マーク２０を、同じくｙ軸上に
ｙ軸マーク２１を、同じくｚ軸上にｚ軸マーク２２を、
それぞれ付する。これら各マーク２０〜２２は、ペン等
により、球４の質量（不釣り合い量）を変えない様な手
段により付する。When the static imbalance of the sphere 4 is measured by the measuring device constructed as described above, it is carried out as follows. First, assuming the x, y, and z axes (three rotation axes of the first, second, and third) orthogonal to each other at the center of the sphere 4, the x-axis mark 20 is located on the x-axis position on the surface of the sphere 4. The y-axis mark 21 on the y-axis, the z-axis mark 22 on the z-axis,
Attach each. These marks 20 to 22 are attached by a means such as a pen that does not change the mass (unbalanced amount) of the sphere 4.
【００１３】この様にして上記各マーク２０〜２２を付
したならば、上記ｘ，ｙ，ｚ軸毎に上記球４を自転させ
つつ、自転速度及び静的不釣り合いにより発生する遠心
力を測定する。即ち、先ず上記ｘ軸マーク２０を、上記
ノズル１５の設置位置及び開口方向から知れる自転軸上
に位置させて上記ノズル１５から圧縮空気を噴出し、上
記球４を回転させる。When the marks 20 to 22 are attached in this manner, the rotation speed and the centrifugal force generated by static imbalance are measured while rotating the sphere 4 for each of the x, y and z axes. To do. That is, first, the x-axis mark 20 is positioned on the rotation axis known from the installation position of the nozzle 15 and the opening direction, and compressed air is ejected from the nozzle 15 to rotate the sphere 4.
【００１４】上述の様に球４をｘ軸を中心に自転させる
と、この球４の静的不釣り合いに基づいてこの球４が、
鉛直方向に振動する。そしてこの振動が前記気体軸受６
に、スラスト荷重として加わる。球４の外周面と球状凹
面１２の内周面との間には極く薄い空気の層が存在する
が、この空気は粘性流体の如く機能して、上記球４の振
動をほぼそのまま上記気体軸受６に伝達する。従って、
この気体軸受６を支承している荷重変換器７の出力によ
り、静的不釣り合いに基づいて上記球４に発生する、ｘ
軸回りの遠心力Ｆx を求める事ができる。これと同時
に、前記メータ１９の表示に表われる振動数から、上記
球４の回転速度及び自転角速度ωを求める。ｙ軸及びｚ
軸に関しても、同様の測定作業を行なって、ｙ軸回りの
遠心力Ｆyと、Ｚ軸回りの遠心力Ｆz とを求める。自転
角速度ωは、ｘ，ｙ，ｚ軸に関して総て等しくなる様
に、上記ノズル１５から噴出する圧縮空気の量を調整す
る。但し、ωが異なった場合でも、計算により、ωが同
じとした場合の、各軸回りの遠心力Ｆx 、Ｆy 、Ｆz を
求める。そして、この様にして求めた各軸回りの遠心力
Ｆx 、Ｆy 、Ｆz により、次の（１）式より、静的不釣
り合い（偏重心距離＝幾何中心と重心との距離）ｅを求
める。尚、（１）式中のＭは球４の質量である。
ｅ＝√（Ｆx 2＋Ｆy 2＋Ｆz 2）／（√２・ω2 ・Ｍ） −−− （１）When the sphere 4 is rotated about the x-axis as described above, the sphere 4 is caused to move based on the static imbalance of the sphere 4.
It vibrates vertically. This vibration causes the gas bearing 6
Is added as a thrust load. An extremely thin layer of air exists between the outer peripheral surface of the sphere 4 and the inner peripheral surface of the spherical concave surface 12, and this air functions like a viscous fluid, and the vibration of the sphere 4 is almost unchanged. It is transmitted to the bearing 6. Therefore,
Due to the output of the load converter 7 supporting the gas bearing 6, the sphere 4 is generated on the basis of static imbalance, x
The centrifugal force F x about the axis can be obtained. At the same time, the rotation speed and the rotation angular speed ω of the sphere 4 are obtained from the frequency displayed on the display of the meter 19. y-axis and z
Also with respect to the axis, by performing the same measurement operation, obtaining a centrifugal force F y in y-axis, and a centrifugal force F z around the Z-axis. The amount of compressed air ejected from the nozzle 15 is adjusted so that the rotation angular velocity ω is all equal on the x, y, and z axes. However, even if ω is different, the centrifugal forces F x , F y , and F z around each axis are calculated by the calculation when ω is the same. Then, according to the centrifugal forces F x , F y , and F z around each axis thus obtained, the static imbalance (distance of the center of gravity = distance between the geometric center and the center of gravity) e is obtained from the following equation (1). Ask for. Incidentally, M in the formula (1) is the mass of the sphere 4. e = √ (F x 2 + F y 2 + F z 2 ) / (√2 · ω 2 · M) −−− (1)
【００１５】前述の様な測定装置を使用して上述の様に
行なう本発明の球の静的不釣り合いの測定方法では、球
４を回転させた後圧縮空気を止め、惰性で回転している
状態で、静的不釣り合いに基づいて発生する遠心力を、
気体軸受６に加わるスラスト荷重として測定する。従っ
て、前述した従来方法の様に、球４を揺動運動させる場
合に比べて、測定時に気体軸受６の球状凹面１２の内周
面と球４の外周面との間の隙間部分での空気の流れの影
響を軽減できる。この為、上記遠心力（スラスト荷重）
を、静的不釣り合い以外の要素に影響される事なく正確
に測定できて、球の静的不釣り合いを正確に求める事が
できる。尚、実際には、球４の静的不釣り合いを求める
のに先立って、静的不釣り合いが既知である球４に関す
る３種類の測定結果を求め、この測定結果と、既知の静
的不釣り合いとから、測定装置の検定をしておく。そし
て、検定結果に応じて、必要であれば、上記（１）式に
比例常数を掛ける。尚、本発明の測定装置とパーソナル
コンピュータ等の演算器とを接続して、この演算器によ
り上記（１）式の計算を行なわせ、静的不釣り合いｅの
算出を自動的に行なわせる事もできる。In the method for measuring the static imbalance of the sphere of the present invention which is carried out as described above by using the measuring device as described above, the compressed air is stopped after the sphere 4 is rotated, and the sphere 4 is rotated by inertia. In the state, centrifugal force generated based on static imbalance is
The thrust load applied to the gas bearing 6 is measured. Therefore, as compared with the case where the ball 4 is oscillated as in the above-described conventional method, the air in the gap portion between the inner peripheral surface of the spherical concave surface 12 of the gas bearing 6 and the outer peripheral surface of the ball 4 is measured at the time of measurement. The influence of the flow of can be reduced. Therefore, the centrifugal force (thrust load)
Can be accurately measured without being affected by factors other than the static imbalance, and the static imbalance of the sphere can be accurately obtained. Actually, prior to obtaining the static imbalance of the sphere 4, three types of measurement results regarding the sphere 4 whose static imbalance is known are obtained, and the measurement result and the known static imbalance are obtained. Therefore, the measurement device is certified. Then, depending on the test result, if necessary, the equation (1) is multiplied by the proportional constant. It is also possible to connect the measuring device of the present invention to an arithmetic unit such as a personal computer, and use the arithmetic unit to calculate the equation (1) to automatically calculate the static imbalance e. it can.
【００１６】[0016]
【発明の効果】本発明の球の静的不釣り合いの測定方法
と測定装置は、以上に述べた通り構成され作用するの
で、球の静的不釣り合いを正確に求める事ができ、球を
組み込んだ玉軸受等の性能向上に寄与できる。The static imbalance measuring method and measuring device of the present invention are constructed and operate as described above, so that the static imbalance of a ball can be accurately determined and the ball is incorporated. It can contribute to the performance improvement of ball bearings.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の実施例を示す縦断側面図。FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.
【図２】従来装置を示す縦断面図。FIG. 2 is a vertical cross-sectional view showing a conventional device.
【図３】図２の側方から見た図。FIG. 3 is a view seen from the side of FIG.
１ 気体軸受 ２ ノズル ３ 球状凹面 ４ 球 ５ 基台 ６ 気体軸受 ７ 荷重変換器 ８ 底板 ９ 周板 １０ ケース １１ 多孔質材 １２ 球状凹面 １３ａ、１３ｂ 給気孔 １４ 圧縮空気源 １５ ノズル １６ 給気管 １７ 弁 １８ アンプ １９ メータ ２０ ｘ軸マーク ２１ ｙ軸マーク ２２ ｚ軸マーク 1 Gas bearing 2 nozzles 3 spherical concave surface Four balls 5 bases 6 Gas bearing 7 load converter 8 bottom plate 9 peripheral plates 10 cases 11 Porous material 12 Spherical concave surface 13a, 13b Air supply hole 14 Compressed air source 15 nozzles 16 Air supply pipe 17 valves 18 amp 19 meters 20 x-axis mark 21 y-axis mark 22 z-axis mark
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−297740（ＪＰ，Ａ) 実開 昭48−51388（ＪＰ，Ｕ) 実開 昭62−155346（ＪＰ，Ｕ) 実開 昭48−51387（ＪＰ，Ｕ) 特公 昭49−39714（ＪＰ，Ｂ１) 米国特許4688427（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01M 1/16 G01M 1/12 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-297740 (JP, A) real-open Sho-48-51388 (JP, U) real-open Sho-62-155346 (JP, U) real-open Sho-48- 51387 (JP, U) JP-B-49-39714 (JP, B1) US Pat. No. 4688427 (US, A) (58) Fields investigated (Int.Cl. 7 , DB name) G01M 1/16 G01M 1/12
Claims (3)
３本の自転軸を設定し、これら３本の自転軸毎に上記球
を自転させつつ、自転速度及び静的不釣り合いにより発
生する遠心力を測定して、上記３本の自転軸毎に上記自
転速度及び遠心力に関する測定結果を求め、これら３種
類の測定結果に基づいて上記球の静的不釣り合いを算定
する球の静的不釣り合いの測定方法。1. A first rotation axis, a second rotation axis, and a third rotation axis, which are orthogonal to each other, are set on a sphere, and the rotation speed and static imbalance are caused while rotating the sphere for each of these three rotation axes. The sphere for measuring the static force imbalance of the sphere based on the measurement results of the above-mentioned rotation speed and centrifugal force for each of the above-mentioned three rotation axes by measuring the centrifugal force generated by Method of measuring static imbalance of.
状凹面の内側に球を回転自在に支承する気体軸受と、こ
の気体軸受に加わるスラスト荷重を測定する荷重測定セ
ンサと、上記気体軸受に支承された球に圧力気体を吹き
付けてこの球を自転させるノズルと、上記荷重測定セン
サの出力信号に基づいて上記球の自転速度及び遠心力を
求めるのに必要な測定値を得る為の電気回路とを備えた
球の静的不釣り合いの測定装置。2. A gas bearing having a spherical concave surface with an opening at the top, which rotatably supports a sphere inside the spherical concave surface, a load measuring sensor for measuring a thrust load applied to the gas bearing, and the gas bearing. A nozzle that blows pressurized gas to the sphere supported on the sphere to rotate the sphere, and an electric device for obtaining the measurement values necessary to obtain the rotation speed and centrifugal force of the sphere based on the output signal of the load measurement sensor. Measuring device for static imbalance of a sphere with a circuit.
器により静的不釣り合いを算出する、請求項２に記載し
た球の静的不釣り合いの測定装置。3. The static imbalance measuring device for a sphere according to claim 2, wherein an electric circuit and an arithmetic unit are connected, and the static imbalance is calculated by the arithmetic unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00046295A JP3391131B2 (en) | 1995-01-06 | 1995-01-06 | Measuring method and measuring device for static imbalance of sphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00046295A JP3391131B2 (en) | 1995-01-06 | 1995-01-06 | Measuring method and measuring device for static imbalance of sphere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08189873A JPH08189873A (en) | 1996-07-23 |
| JP3391131B2 true JP3391131B2 (en) | 2003-03-31 |
Family
ID=11474469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00046295A Expired - Lifetime JP3391131B2 (en) | 1995-01-06 | 1995-01-06 | Measuring method and measuring device for static imbalance of sphere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3391131B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928158B (en) * | 2012-10-24 | 2015-09-23 | 北京航天控制仪器研究所 | A kind of static balancing tester based on air-bearing |
-
1995
- 1995-01-06 JP JP00046295A patent/JP3391131B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08189873A (en) | 1996-07-23 |
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