JP3463700B2 - Magnetic coupling device - Google Patents
Magnetic coupling deviceInfo
- Publication number
- JP3463700B2 JP3463700B2 JP12309694A JP12309694A JP3463700B2 JP 3463700 B2 JP3463700 B2 JP 3463700B2 JP 12309694 A JP12309694 A JP 12309694A JP 12309694 A JP12309694 A JP 12309694A JP 3463700 B2 JP3463700 B2 JP 3463700B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- magnetic
- permanent magnets
- poles
- coupling device
- 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.)
- Expired - Fee Related
Links
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- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、駆動軸と被駆動軸を磁
気的に結合してトルクを伝達する磁気カップリング装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic coupling device for magnetically coupling a drive shaft and a driven shaft to transmit torque.
【０００２】[0002]
【従来の技術】従来、駆動軸と被駆動軸を磁気的に結合
してトルクを伝達する磁気カップリング装置は、軸端を
突き合わせて配置した駆動軸と被駆動軸の両方の軸端に
それぞれ円板状の永久磁石を固定し、両方の永久磁石を
互いに対向させ、両方の永久磁石の吸引力により駆動軸
と被駆動軸を磁気的に結合するものが開示されている
（例えば、特開昭６２−５８１０４号）。また、駆動軸
に固定した円板状の永久磁石の円周方向に交互にかつ等
間隔に異極になるように複数の磁極を形成させたものが
開示されている（例えば、実開昭５８−１０８７７７
号）。2. Description of the Related Art Conventionally, a magnetic coupling device that magnetically couples a drive shaft and a driven shaft to transmit torque has a shaft end abuttingly arranged on both ends of the drive shaft and the driven shaft. It is disclosed that a disk-shaped permanent magnet is fixed, both permanent magnets are opposed to each other, and the driving shaft and the driven shaft are magnetically coupled by the attraction force of both permanent magnets (for example, Japanese Patent Laid-Open Publication No. 2000-242242). 62-58104). Further, there is disclosed a disk-shaped permanent magnet fixed to a drive shaft in which a plurality of magnetic poles are formed so as to have different poles alternately and equidistantly in the circumferential direction (for example, actual development Sho 58. -108777
issue).
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来技術で
は、永久磁石の磁極が円周方向に等間隔に、磁極が形成
されているため、対向する磁極が単純に異極になってい
るので、駆動軸と被駆動軸が相対的に磁極ピッチの２倍
だけ円周方向にずれたところでも結合される。すなわ
ち、例えば磁極が４極の場合、円周方向に１８０度ずれ
た２か所で対向する磁極が異極となって、駆動軸と被駆
動軸が結合される。しかし、例えばモータ軸と駆動検出
器の出力軸との結合のように、駆動軸と被駆動軸の基準
位置のずれが許すことができない場合でも、基準位置が
円周方向に１８０度ずれたまま組み立てる恐れがあっ
た。また、円板状の永久磁石の互いに対向する面にでき
る磁極は、駆動軸の中心に対して対称の位置の磁極が同
極になるため、同心度がずれても修正する力が働かず、
両方の永久磁石を組立てる時、ずれたまま駆動軸と被駆
動軸の軸受の位置を決めて組み立てる恐れがあった。本
発明は、駆動軸と被駆動軸の位置が必ず１か所で、か
つ、ずれの生じないように組み立てられるカップリング
装置を提供することを目的とするものである。However, in the prior art, since the magnetic poles of the permanent magnet are formed at equal intervals in the circumferential direction, the opposing magnetic poles are simply different poles. The drive shaft and the driven shaft are coupled even when they are relatively displaced from each other by twice the magnetic pole pitch in the circumferential direction. That is, for example, when the magnetic pole has four poles, the magnetic poles facing each other at two positions shifted by 180 degrees in the circumferential direction become different poles, and the drive shaft and the driven shaft are coupled. However, even if the deviation of the reference position between the drive shaft and the driven shaft cannot be allowed, as in the case of coupling the motor shaft and the output shaft of the drive detector, for example, the reference position remains deviated by 180 degrees in the circumferential direction. There was a fear of assembling. Further, the magnetic poles formed on the surfaces of the disk-shaped permanent magnets facing each other have the same poles at positions symmetrical with respect to the center of the drive shaft, so even if the concentricity deviates, the correcting force does not work,
When assembling both permanent magnets, there was a risk that the bearings of the drive shaft and the driven shaft would be positioned while they were misaligned. SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling device in which the drive shaft and the driven shaft are always at one position and can be assembled so that no displacement occurs.
【０００４】[0004]
【課題を解決するための手段】上記問題を解決するた
め、本発明は、同一の軸心を持つ二つの軸と、前記二つ
の軸が対向する側の軸端にそれぞれ固定した永久磁石
と、前記永久磁石の対向面に、円周方向に分割した磁極
領域を形成し、前記二つの軸の基準位置で前記各磁極領
域で対向する磁極の極性が異極になるように円周方向に
配列した磁極パターンを備え、前記磁極の吸引力により
前記二つの軸を結合する磁気カップリング装置におい
て、前記磁極パターンは、前記磁極領域を等分にし、そ
の極性を２進の乱数でＮ極とＳ極を決めて配列したもの
である。また、前記磁極パターンは、径方向に同心状に
複数分割して設けてもよい。また、前記両方の永久磁石
の対向面は、それぞれ同じ曲率半径を持つ凸状球面と凹
状球面に形成してもよい。In order to solve the above problems, the present invention provides two shafts having the same shaft center, and permanent magnets fixed to shaft ends on the side where the two shafts face each other. Magnetic poles divided in the circumferential direction on the facing surface of the permanent magnet
A region, and each of the magnetic pole regions is defined at the reference position of the two axes.
In the circumferential direction so that the polarities of the opposing magnetic poles in the area are different
In a magnetic coupling device having an arrayed magnetic pole pattern and coupling the two shafts by the attraction force of the magnetic pole , the magnetic pole pattern divides the magnetic pole region into
The polarities of are determined by arranging the N pole and the S pole with binary random numbers . Further, the magnetic pole pattern may be provided by being concentrically divided into a plurality of pieces in the radial direction. The facing surfaces of the two permanent magnets may be formed as a convex spherical surface and a concave spherical surface having the same radius of curvature.
【０００５】[0005]
【作用】上記手段により、二つの軸に固定した両方の永
久磁石を円周方向に分割して磁極パターンを形成し、二
つの軸の基準位置のみで、磁極領域で対向する磁極の極
性が異極になるように、磁極パターンの各磁極領域の磁
極の円周方向の順序を配列してあるので、基準位置での
結合力が他の位置の結合力より大きくなる。したがっ
て、結合力の最大位置を見つけることにより、基準位置
を決めることができる。また、磁極パターンは、半径方
向に分割した同心状の複数段のパターンとしてあるの
で、中心が一致する相対位置で、しかも対向する磁極が
全て異極になる位置で結合力が最も強くなり、同心度の
ずれを防ぐことができる。また、両方の永久磁石の対向
する面をそれぞれ同じ曲率半径を持つ凸状球面と凹状球
面に形成してあるので、駆動軸と被駆動軸が径方向に多
少中心軸がずれても、互いに密着し、結合することがで
きる。By the above means, both permanent magnets fixed to two shafts are circumferentially divided to form a magnetic pole pattern, and the polarities of the opposing magnetic poles in the magnetic pole regions differ only at the reference positions of the two shafts. Since the magnetic poles in each magnetic pole region of the magnetic pole pattern are arranged in the circumferential direction in order to form a pole, the coupling force at the reference position is larger than the coupling force at other positions. Therefore, the reference position can be determined by finding the maximum position of the binding force. Further, since the magnetic pole pattern is a pattern of a plurality of concentric steps divided in the radial direction, the coupling force becomes the strongest at the relative positions where the centers are coincident with each other and where the opposing magnetic poles are all different poles. It is possible to prevent deviations. In addition, since the facing surfaces of both permanent magnets are formed as convex spherical surfaces and concave spherical surfaces having the same radius of curvature, respectively, even if the drive shaft and the driven shaft are slightly displaced from each other in the radial direction, they will be in close contact with each other. And can be combined.
【０００６】[0006]
【実施例】以下、本発明を図に示す実施例について説明
する。図１（ａ）は本発明の実施例の駆動軸、図１
（ｂ）は被駆動軸の正面図、図２はその側断面図であ
る。図において、同一の軸心を持つ駆動軸１および被駆
動軸１’の軸端には、熱伝導率が低く弾性を備えたフィ
ルム状の合成樹脂からなる円板状の磁石ベース部２、
２’に、ゴム製のマグネットシートからなる永久磁石
３、３’を貼り合わせたフランジ部４、４’を固定し、
両方の永久磁石３、３’が互いに吸引して結合するよう
にしてある。なお、永久磁石３、３’をフェライト磁石
などで構成し、その表面にゴムなどの弾性体からなるシ
ートを張りつけて、両方の永久磁石３、３’の間の衝撃
を防ぐようにしてもよい。永久磁石３、３’の磁極パタ
ーンは、図１に示すように、半径方向に２分割した同心
状の２段のパターンとし、それぞれ円周方向に８等分し
て分割された磁極領域の磁極の円周方向の順序を交互に
異極にせず、両方の永久磁石３、３’を対向させた時の
吸引力が最大になる円周方向の相対位置が基準位置の１
か所になるように配列してある。すなわち、駆動軸１、
１’の永久磁石３、３’の８等分した円周方向の磁極領
域をＡ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，Ｇ，Ｈとすると、永久磁
石３の磁極領域Ａ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，Ｇ，Ｈに対応
する１段目の磁極パターンの配列の順序をＳ，Ｓ，Ｎ，
Ｎ，Ｎ，Ｓ，Ｎ，Ｓとし、永久磁石３’の磁極パターン
の配列の順序を永久磁石３の逆の磁極パターンである
Ｎ，Ｎ，Ｓ，Ｓ，Ｓ，Ｎ，Ｓ，Ｎとしてある。この配列
の順序は、２進の乱数で、例えば、０，０，１，１，
１，０，１，０を取り上げ、１をＮ極、０をＳ極として
順序を決めてある。永久磁石３、３’の２段目の各磁極
領域の磁極は１段目と異極となるようにしてある。Embodiments of the present invention will be described below with reference to the drawings. 1 (a) is a drive shaft of an embodiment of the present invention, FIG.
(B) is a front view of the driven shaft, and FIG. 2 is a side sectional view thereof. In the figure, a disk-shaped magnet base portion 2 made of a film-shaped synthetic resin having a low thermal conductivity and elasticity is provided at the shaft ends of a driving shaft 1 and a driven shaft 1 ′ having the same shaft center.
To the 2 ', fix the flange portions 4 and 4'to which the permanent magnets 3 and 3'made of a rubber magnet sheet are attached,
Both permanent magnets 3 and 3'are attracted to each other and connected. The permanent magnets 3 and 3'may be formed of ferrite magnets or the like, and a sheet made of an elastic material such as rubber may be attached to the surface of the permanent magnets 3 and 3'to prevent impact between the permanent magnets 3 and 3 '. . As shown in FIG. 1, the magnetic pole pattern of the permanent magnets 3 and 3'is a concentric two-step pattern divided into two in the radial direction, and each of the magnetic poles is divided into eight equal parts in the circumferential direction. The relative position in the circumferential direction that maximizes the attraction force when the two permanent magnets 3 and 3'are opposed to each other is not set as the reference position.
It is arranged so that it becomes a place. That is, the drive shaft 1,
Letting A, B, C, D, E, F, G, and H be the magnetic pole regions in the circumferential direction of the permanent magnets 3 and 3 ′ of 1 ′ divided into eight, the magnetic pole regions A, B, and C of the permanent magnet 3 are shown. , D, E, F, G, H, the order of arrangement of the first-stage magnetic pole patterns is S, S, N,
N, N, S, N, S, and the order of arrangement of the magnetic pole patterns of the permanent magnet 3'is N, N, S, S, S, N, S, N which are the opposite magnetic pole patterns of the permanent magnet 3. . The order of this array is a binary random number, for example, 0, 0, 1, 1,
1, 0, 1, 0 is taken up, and the order is determined with 1 being the north pole and 0 being the south pole. The magnetic poles in the second magnetic pole regions of the permanent magnets 3 and 3'are made different from the first magnetic pole.
【０００７】駆動軸１と被駆動軸１’の円周方向の相対
位置を４５度ずらして組み合わせると、互いに対向する
永久磁石３と３’の磁極領域Ａ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，
Ｇ，Ｈの磁極は、図３に示すように、永久磁石３の１段
目がＳ，Ｓ，Ｎ，Ｎ，Ｎ，Ｓ，Ｎ，Ｓとなり、永久磁石
３’の１段目がＮ，Ｓ，Ｓ，Ｓ，Ｎ，Ｓ，Ｎ，Ｎとな
る。したがって、基準位置で全ての磁極領域で対向する
磁極の極性が異極になっていたのに対して、４５度ずれ
た位置で対向する磁極の極性は、４個の磁極領域で異極
性になり、残りの４個の磁極領域で同極性となる。１の
吸引力を１単位とすれば、基準位置では合成力が全て吸
引力となって８単位の吸引力を発生するが、４５度ずれ
た位置では、吸引力と反発力とが同数の磁極領域で発生
するため、結合力は０となる。次の表１は、駆動軸１と
被駆動軸１’の円周方向の相対位置を４５度づつずらし
た位置の磁極の極性と結合力を示したものであり、永久
磁石のずれ角度と結合力との関係を示したものである。When the relative positions of the driving shaft 1 and the driven shaft 1'in the circumferential direction are shifted by 45 degrees and combined, the magnetic pole areas A, B, C, D, E, F of the permanent magnets 3 and 3'which face each other are combined. ，
As for the magnetic poles G and H, as shown in FIG. 3, the first stage of the permanent magnet 3 is S, S, N, N, N, S, N, S, and the first stage of the permanent magnet 3'is N, S, S, S, N, S, N, N. Therefore, the polarities of the facing magnetic poles are different in all the magnetic pole regions at the reference position, whereas the polarities of the facing magnetic poles at the positions shifted by 45 degrees are different in the four magnetic pole regions. , The remaining four magnetic pole regions have the same polarity. If the attraction force of 1 is 1 unit, the combined force becomes the attraction force at the reference position to generate 8 units of attraction force, but at the position shifted by 45 degrees, the attraction force and the repulsion force have the same number of magnetic poles. Since it occurs in the region, the binding force becomes zero. The following Table 1 shows the polarities and coupling forces of the magnetic poles at the positions where the relative positions of the driving shaft 1 and the driven shaft 1'in the circumferential direction are shifted by 45 degrees. It shows the relationship with power.
【０００８】[0008]
【表１】 [Table 1]
【０００９】これによれば、基準位置の１か所で最大の
吸引力を得ることができるので、基準位置での結合力が
最も強くなり、基準位置を決めることができる。また、
磁極パターンを同心状に２段に形成してあるので、両方
に永久磁石３、３’の中心が一致する相対位置で、しか
も対向する磁極が全て異極になる位置で結合力が最も強
くなり、同心度のずれを防ぐことができる。なお、上記
の磁極パターンの配列の順序を決めた乱数は１例に過ぎ
ないが、両方の永久磁石を相対的に円周方向にずらした
時、結合力が最大になる位置が１か所になるような磁極
を決めることができる順序の乱数であればよい。また、
図５に示すように、永久磁石３と３’の対面する磁極が
それぞれ異極であれば、１段目と２段目の磁極パターン
は互いに円周方向にずれてもよい。また、上記実施例で
は磁極パターンの磁極領域を円周方向に８等分したが、
等分する数を１０、１２等分のように偶数で分割数を増
やすとともに、乱数の桁数を増やして吸引力が最大にな
る円周方向の位置が１か所になるように磁極を決めれ
ば、駆動軸と被駆動軸の位置決め精度を高くすることが
できる。また、上記実施例では磁極パターンの配列の順
序を、２進の乱数で決めて円周方向に等分に分割した
が、図６に示すように、磁極パターンの各磁極領域の面
積をそれぞれ変えて、円周方向にランダムに不等分に分
割し、両方の永久磁石３、３’の対向する磁極領域
（Ａ’，Ｂ’，Ｃ’，Ｄ’）は同一面積とし、かつ異極
になるようにしてもよい。また、図７（ａ）に示すよう
に、両方の永久磁石３、３’の対向する面をそれぞれ同
じ曲率半径を持つ凸状球面３１と凹状球面３２に形成
し、図７（ｂ）に示すように、駆動軸と被駆動軸が多少
中心軸がずれても、互いに密着するようにしてもよい。
さらに、上記実施例では径方向に２段に分割して磁極パ
ターンを形成していたが、２段に限るものではなく、２
段以上に分割したものでもよい。According to this, since the maximum suction force can be obtained at one of the reference positions, the coupling force at the reference position becomes the strongest and the reference position can be determined. Also,
Since the magnetic pole patterns are concentrically formed in two steps, the coupling force becomes the strongest at the relative position where the centers of the permanent magnets 3 and 3'are aligned with each other and at the position where all the facing magnetic poles have different polarities. , It is possible to prevent deviation of concentricity. Note that the random number that determines the order of the arrangement of the magnetic pole patterns is only an example, but when both permanent magnets are relatively displaced in the circumferential direction, the position where the coupling force becomes maximum is one. Any random number may be used in such an order that the magnetic poles can be determined. Also,
As shown in FIG. 5, if the facing magnetic poles of the permanent magnets 3 and 3'are different poles, the magnetic pole patterns of the first and second stages may deviate from each other in the circumferential direction. In the above embodiment, the magnetic pole area of the magnetic pole pattern is divided into eight equal parts in the circumferential direction.
Increase the number of divisions by an even number such that the number of equal divisions is evenly divided into 10 and 12, and increase the number of digits in the random number to determine the magnetic poles so that there is only one position in the circumferential direction that maximizes the attractive force. For example, the positioning accuracy of the drive shaft and the driven shaft can be increased. Further, in the above-mentioned embodiment, the arrangement order of the magnetic pole patterns is determined by a binary random number and divided into equal parts in the circumferential direction. However, as shown in FIG. 6, the area of each magnetic pole region of the magnetic pole pattern is changed. The permanent magnets 3 and 3'are divided into unequal parts in the circumferential direction at random, and the opposing magnetic pole areas (A ', B', C ', D') have the same area and different polarities. It may be. Further, as shown in FIG. 7A, the opposing surfaces of both permanent magnets 3 and 3'are formed into a convex spherical surface 31 and a concave spherical surface 32 having the same radius of curvature, respectively, and shown in FIG. 7B. As described above, the driving shaft and the driven shaft may be in close contact with each other even if their central axes are slightly deviated from each other.
Further, in the above-mentioned embodiment, the magnetic pole pattern is formed by being divided into two steps in the radial direction, but the number of steps is not limited to two, and it is not limited to two steps.
It may be divided into more than two steps.
【００１０】[0010]
【発明の効果】以上述べたように、本発明によれば、二
つの軸に固定した永久磁石のそれぞれ対向する面に、円
周方向に複数の磁極領域を有する磁極パターンを設け、
結合力が最大になる円周方向の位置が二つの軸の基準位
置１か所になるように磁極を決めてあるので、二つの軸
の相対位置が狂うことなく、容易に相対位置を決めて結
合することができる。また、径方向に分割した磁極パタ
ーンを設けてあるので、容易に同心度を維持することが
できる。さらに、両方の永久磁石の互いに対向する面を
凸状球面および凹状球面に形成してあるので、二つの軸
の間に多少のずれがあっても二つの永久磁石が密着する
ことができる効果がある。As described above, according to the present invention, the magnetic pole patterns having a plurality of magnetic pole regions in the circumferential direction are provided on the surfaces of the permanent magnets fixed to the two shafts, which face each other.
Since the magnetic poles are set so that the position in the circumferential direction that maximizes the coupling force is one reference position for the two shafts, the relative positions for the two shafts can be easily determined without changing the relative positions. Can be combined. Further, since the magnetic pole patterns divided in the radial direction are provided, the concentricity can be easily maintained. Furthermore, since the surfaces of both permanent magnets facing each other are formed into a convex spherical surface and a concave spherical surface, the effect that the two permanent magnets can adhere even if there is a slight misalignment between the two shafts is obtained. is there.
【図１】 本発明の実施例を示す正面図である。FIG. 1 is a front view showing an embodiment of the present invention.
【図２】 本発明の実施例を示す側断面図である。FIG. 2 is a side sectional view showing an embodiment of the present invention.
【図３】 本発明の実施例の両方の永久磁石が相対的に
４５度ずれた位置を示す正面図である。FIG. 3 is a front view showing a position in which both permanent magnets of the embodiment of the present invention are relatively displaced by 45 degrees.
【図４】 本発明の実施例の永久磁石のずれ角度と結合
力との関係を示す説明図である。FIG. 4 is an explanatory diagram showing a relationship between a displacement angle of a permanent magnet and a coupling force according to an embodiment of the present invention.
【図５】 本発明の他の実施例を示す正面図である。FIG. 5 is a front view showing another embodiment of the present invention.
【図６】 本発明の他の実施例を示す正面図である。FIG. 6 is a front view showing another embodiment of the present invention.
【図７】 本発明の他の実施例を示す側断面図である。FIG. 7 is a side sectional view showing another embodiment of the present invention.
１ 駆動軸、１’被駆動軸、２、２’磁石ベース部、
３、３’ 永久磁石、３１ 凸状球面、３２ 凹状球
面、４、４’ フランジ部、1 drive shaft, 1'driven shaft, 2, 2'magnet base,
3, 3'permanent magnet, 31 convex spherical surface, 32 concave spherical surface, 4, 4'flange portion,
Claims (3)
軸が対向する側の軸端にそれぞれ固定した永久磁石と、
前記永久磁石の対向面に、円周方向に分割した磁極領域
を形成し、前記二つの軸の基準位置で前記各磁極領域で
対向する磁極の極性が異極になるように円周方向に配列
した磁極パターンを備え、前記磁極の吸引力により前記
二つの軸を結合する磁気カップリング装置において、前記磁極パターンは、前記磁極領域を等分にし、その極
性を２進の乱数でＮ極とＳ極を決めて配列した ことを特
徴とする磁気カップリング装置。1. Two shafts having the same shaft center, and permanent magnets fixed to shaft ends on the side where the two shafts face each other, respectively.
Circumferentially divided magnetic pole regions on the facing surface of the permanent magnet
In each of the magnetic pole regions at the reference position of the two axes.
Arranged in the circumferential direction so that the opposite magnetic poles have different polarities
In the magnetic coupling device having the magnetic pole pattern described above , wherein the two shafts are coupled by the attraction force of the magnetic pole , the magnetic pole pattern divides the magnetic pole region into
A magnetic coupling device characterized by arranging the N and S poles with binary random numbers .
数分割して設けられたものである請求項１記載の磁気カThe magnetic power according to claim 1, wherein the magnetic power is provided by being divided into several parts.
ップリング装置。Pulling device.
れ同じ曲率半径を持つ凸状球面と凹状球面に形成したも
のである請求項１または２記載の磁気カップリング装
置。 3. The magnetic coupling device according to claim 1, wherein the facing surfaces of the two permanent magnets are formed as a convex spherical surface and a concave spherical surface having the same radius of curvature, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12309694A JP3463700B2 (en) | 1994-05-11 | 1994-05-11 | Magnetic coupling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12309694A JP3463700B2 (en) | 1994-05-11 | 1994-05-11 | Magnetic coupling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07308060A JPH07308060A (en) | 1995-11-21 |
| JP3463700B2 true JP3463700B2 (en) | 2003-11-05 |
Family
ID=14852110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12309694A Expired - Fee Related JP3463700B2 (en) | 1994-05-11 | 1994-05-11 | Magnetic coupling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3463700B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH07308060A (en) | 1995-11-21 |
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