JP6897523B2

JP6897523B2 - Eddy current damper

Info

Publication number: JP6897523B2
Application number: JP2017228254A
Authority: JP
Inventors: 薫平佐野; 裕野上; 今西　憲治; 憲治今西; 亮介増井; 野口　泰隆; 泰隆野口
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 2017-11-28
Filing date: 2017-11-28
Publication date: 2021-06-30
Anticipated expiration: 2037-11-28
Also published as: JP2019100364A

Description

本発明は、渦電流式ダンパに関する。 The present invention relates to an eddy current damper.

地震等による振動から建築物を保護するために、建築物に制震装置が取り付けられる。制震装置は建築物に与えられた運動エネルギを熱エネルギ等の他のエネルギに変換する。これにより、建築物の大きな揺れが抑制される。制震装置はたとえば、ダンパである。ダンパの種類はたとえば、オイル式、せん断抵抗式がある。一般に、建築物にはオイル式やせん断抵抗式ダンパが使用されることが多い。オイル式ダンパは、シリンダ内の非圧縮性流体を利用して振動を減衰させる。せん断抵抗式ダンパは、粘性流体のせん断抵抗を利用して振動を減衰させる。 Seismic control devices are installed in buildings to protect them from vibrations caused by earthquakes. The vibration control device converts the kinetic energy given to the building into other energy such as thermal energy. As a result, large shaking of the building is suppressed. The vibration control device is, for example, a damper. The types of dampers include, for example, an oil type and a shear resistance type. In general, oil type and shear resistance type dampers are often used for buildings. Oil dampers utilize the incompressible fluid in the cylinder to dampen vibrations. Shear resistance dampers utilize the shear resistance of viscous fluids to dampen vibrations.

しかしながら、特にせん断抵抗式ダンパで用いられる粘性流体の粘度は、粘性流体の温度に依存する。すなわち、せん断抵抗式ダンパの減衰力は、温度に依存する。したがって、せん断抵抗式ダンパを建築物に使用する際には、使用環境を考慮して適切な粘性流体を選択する必要がある。また、オイル式やせん断抵抗式などの流体を用いているダンパは、温度上昇等によって流体の圧力が上昇し、シリンダのシール材などの機械的な要素が破損する恐れがある。減衰力が温度に依存しないダンパとして、渦電流式ダンパがある。 However, the viscosity of the viscous fluid, especially used in shear resistance dampers, depends on the temperature of the viscous fluid. That is, the damping force of the shear resistance type damper depends on the temperature. Therefore, when using a shear resistance damper in a building, it is necessary to select an appropriate viscous fluid in consideration of the usage environment. Further, in a damper using a fluid such as an oil type or a shear resistance type, the pressure of the fluid rises due to a temperature rise or the like, and there is a risk that mechanical elements such as a cylinder sealing material may be damaged. There is an eddy current type damper as a damper whose damping force does not depend on the temperature.

渦電流式ダンパはたとえば、特公平５−８６４９６号公報（特許文献１）に開示される。 The eddy current type damper is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-86496 (Patent Document 1).

特許文献１の渦電流式ダンパは、主筒に取り付けられた複数の永久磁石と、ねじ軸に接続されたヒステリシス材と、ねじ軸と噛み合うボールナットと、ボールナットに接続された副筒と、を備える。複数の永久磁石は、磁極の配置が交互に異なる。ヒステリシス材は、複数の永久磁石と対向し、相対回転可能である。この渦電流式ダンパに運動エネルギが与えられると、副筒及びボールナットが軸方向に移動し、ボールねじの作用によってヒステリシス材が回転する。これにより、ヒステリシス損により運動エネルギが消費される。また、ヒステリシス材に渦電流が発生するため、渦電流損により運動エネルギが消費される、と特許文献１には記載されている。 The eddy current type damper of Patent Document 1 includes a plurality of permanent magnets attached to a main cylinder, a hysteresis material connected to a screw shaft, a ball nut that meshes with the screw shaft, and a sub cylinder connected to the ball nut. To be equipped. The arrangement of the magnetic poles of the plurality of permanent magnets is alternately different. The hysteresis material faces a plurality of permanent magnets and can rotate relative to each other. When kinetic energy is applied to this eddy current type damper, the auxiliary cylinder and the ball nut move in the axial direction, and the hysteresis material rotates due to the action of the ball screw. As a result, kinetic energy is consumed due to the hysteresis loss. Further, it is described in Patent Document 1 that kinetic energy is consumed due to eddy current loss because eddy current is generated in the hysteresis material.

特公平５−８６４９６号公報Tokuhei No. 5-86496

渦電流式ダンパでは渦電流が発生する部材（導電部材）に集中的に熱が発生する。そのため、短期間に余震が何度も発生したり、１回の地震が長時間続いたりすると、導電部材が高温になる。渦電流を発生させるために導電部材は永久磁石の近傍に設けられる。導電部材が高温になると、輻射熱により永久磁石も高温になる。永久磁石が高温になると、永久磁石が減磁し、発生する渦電流が弱まる。これにより、渦電流式ダンパの減衰力が低下する。そのため、渦電流式ダンパは冷却機構を含むのが望まれる。 In the eddy current type damper, heat is intensively generated in the member (conductive member) in which the eddy current is generated. Therefore, if aftershocks occur many times in a short period of time, or if one earthquake continues for a long time, the temperature of the conductive member becomes high. A conductive member is provided in the vicinity of the permanent magnet to generate an eddy current. When the conductive member becomes hot, the permanent magnet also becomes hot due to radiant heat. When the temperature of the permanent magnet becomes high, the permanent magnet is demagnetized and the generated eddy current is weakened. As a result, the damping force of the eddy current type damper is reduced. Therefore, it is desirable that the eddy current damper includes a cooling mechanism.

しかしながら、特許文献１には、渦電流式ダンパの冷却機構については何ら開示されていない。 However, Patent Document 1 does not disclose any cooling mechanism of the eddy current type damper.

本発明の目的は、導電部材及び永久磁石の過度な温度上昇を抑制できる渦電流式ダンパを提供することである。 An object of the present invention is to provide an eddy current type damper capable of suppressing an excessive temperature rise of a conductive member and a permanent magnet.

本実施形態の渦電流式ダンパは、ねじ軸と、ボールナットと、磁石保持部材と、通風路と、第１永久磁石と、第２永久磁石と、導電部材と、を備える。ボールナットは、ねじ軸とかみ合う。円筒形状の磁石保持部材は、ボールナットに固定される。通風路は、磁石保持部材に設けられ、磁石保持部材の軸方向に対し傾斜する。第１永久磁石は、磁石保持部材の円周方向において通風路に隣接し、磁石保持部材に固定される。第２永久磁石は、磁石保持部材の円周方向において通風路を挟んで第１永久磁石に隣接し、磁石保持部材に固定され、第１永久磁石と磁極の配置が反転している。円筒形状の導電部材は、導電性を有し、第１永久磁石及び第２永久磁石と隙間を空けて対向する。 The eddy current type damper of the present embodiment includes a screw shaft, a ball nut, a magnet holding member, a ventilation path, a first permanent magnet, a second permanent magnet, and a conductive member. The ball nut meshes with the screw shaft. The cylindrical magnet holding member is fixed to the ball nut. The ventilation path is provided in the magnet holding member and is inclined with respect to the axial direction of the magnet holding member. The first permanent magnet is adjacent to the ventilation path in the circumferential direction of the magnet holding member and is fixed to the magnet holding member. The second permanent magnet is adjacent to the first permanent magnet across the ventilation path in the circumferential direction of the magnet holding member, is fixed to the magnet holding member, and the arrangement of the first permanent magnet and the magnetic pole is reversed. The cylindrical conductive member has conductivity and faces the first permanent magnet and the second permanent magnet with a gap.

本実施形態の渦電流式ダンパによれば、導電部材及び永久磁石の過度な温度上昇を抑制できる。 According to the eddy current type damper of the present embodiment, it is possible to suppress an excessive temperature rise of the conductive member and the permanent magnet.

図１は、渦電流式ダンパの軸方向の断面図である。FIG. 1 is a cross-sectional view of the eddy current type damper in the axial direction. 図２は、図１の一部拡大図である。FIG. 2 is a partially enlarged view of FIG. 図３は、通風路を示す斜視図である。FIG. 3 is a perspective view showing a ventilation path. 図４は、渦電流式ダンパの軸方向に垂直な断面図である。FIG. 4 is a cross-sectional view perpendicular to the axial direction of the eddy current type damper. 図５は、図４の一部拡大図である。FIG. 5 is a partially enlarged view of FIG. 図６は、渦電流式ダンパの磁気回路を示す模式図である。FIG. 6 is a schematic view showing a magnetic circuit of an eddy current type damper. 図７は、第２実施形態の第１永久磁石〜第４永久磁石を示す斜視図である。FIG. 7 is a perspective view showing the first permanent magnets to the fourth permanent magnets of the second embodiment. 図８は、第３実施形態の第１永久磁石〜第６永久磁石を示す斜視図である。FIG. 8 is a perspective view showing the first permanent magnets to the sixth permanent magnets of the third embodiment. 図９は、第４実施形態の渦電流式ダンパの軸方向の断面図である。FIG. 9 is a cross-sectional view of the eddy current type damper of the fourth embodiment in the axial direction. 図１０は、図９の一部拡大図である。FIG. 10 is a partially enlarged view of FIG. 図１１は、フィンを含む渦電流式ダンパの断面図である。FIG. 11 is a cross-sectional view of an eddy current type damper including fins. 図１２は、フィンの他の実施形態を示す断面図である。FIG. 12 is a cross-sectional view showing another embodiment of the fin. 図１３は、フィンの他の実施形態を示す断面図である。FIG. 13 is a cross-sectional view showing another embodiment of the fin.

（１）本実施形態の渦電流式ダンパは、ねじ軸と、ボールナットと、磁石保持部材と、通風路と、第１永久磁石と、第２永久磁石と、導電部材と、を備える。ボールナットは、ねじ軸とかみ合う。円筒形状の磁石保持部材は、ボールナットに固定される。通風路は、磁石保持部材に設けられ、磁石保持部材の軸方向に対し傾斜する。第１永久磁石は、磁石保持部材の円周方向において通風路に隣接し、磁石保持部材に固定される。第２永久磁石は、磁石保持部材の円周方向において通風路を挟んで第１永久磁石に隣接し、磁石保持部材に固定され、第１永久磁石と磁極の配置が反転している。円筒形状の導電部材は、導電性を有し、第１永久磁石及び第２永久磁石と隙間を空けて対向する。 (1) The eddy current type damper of the present embodiment includes a screw shaft, a ball nut, a magnet holding member, a ventilation path, a first permanent magnet, a second permanent magnet, and a conductive member. The ball nut meshes with the screw shaft. The cylindrical magnet holding member is fixed to the ball nut. The ventilation path is provided in the magnet holding member and is inclined with respect to the axial direction of the magnet holding member. The first permanent magnet is adjacent to the ventilation path in the circumferential direction of the magnet holding member and is fixed to the magnet holding member. The second permanent magnet is adjacent to the first permanent magnet across the ventilation path in the circumferential direction of the magnet holding member, is fixed to the magnet holding member, and the arrangement of the first permanent magnet and the magnetic pole is reversed. The cylindrical conductive member has conductivity and faces the first permanent magnet and the second permanent magnet with a gap.

ねじ軸及びボールナットは、ボールねじを構成する。渦電流式ダンパに振動が加えられ、ねじ軸が並進運動すると、ねじ軸とかみ合うボールナットが回転運動する。磁石保持部材はボールナットに固定される。したがって、ボールナットが回転すると磁石保持部材も回転する。磁石保持部材には第１永久磁石及び第２永久磁石が固定される。磁石保持部材の円周方向において、第１永久磁石と第２永久磁石との間には隙間が設けられる。この隙間が通風路である。磁石保持部材の回転に伴い、第１永久磁石及び第２永久磁石も回転する。第１永久磁石及び第２永久磁石が回転すると、第１永久磁石と第２永久磁石との間の通風路に空気が流れる。この空気の流れにより、第１永久磁石、第２永久磁石及び導電部材の近傍の熱が拡散される。したがって、第１永久磁石、第２永久磁石及び導電部材の過度な温度上昇が抑制される。 The screw shaft and ball nut constitute a ball screw. When vibration is applied to the eddy current damper and the screw shaft moves in translation, the ball nut that meshes with the screw shaft rotates. The magnet holding member is fixed to the ball nut. Therefore, when the ball nut rotates, the magnet holding member also rotates. A first permanent magnet and a second permanent magnet are fixed to the magnet holding member. A gap is provided between the first permanent magnet and the second permanent magnet in the circumferential direction of the magnet holding member. This gap is the ventilation path. As the magnet holding member rotates, the first permanent magnet and the second permanent magnet also rotate. When the first permanent magnet and the second permanent magnet rotate, air flows in the ventilation path between the first permanent magnet and the second permanent magnet. This air flow diffuses heat in the vicinity of the first permanent magnet, the second permanent magnet, and the conductive member. Therefore, an excessive temperature rise of the first permanent magnet, the second permanent magnet, and the conductive member is suppressed.

（２）上記（１）の渦電流式ダンパにおいて、第１永久磁石は、通風路に沿って磁石保持部材の軸方向に対し傾斜した第１側面を含み、第２永久磁石は、通風路に沿って磁石保持部材の軸方向に対し傾斜した第２側面を含むのが好ましい。 (2) In the eddy current type damper of (1) above, the first permanent magnet includes a first side surface inclined with respect to the axial direction of the magnet holding member along the ventilation path, and the second permanent magnet is in the ventilation path. It is preferable to include a second side surface inclined along the axial direction of the magnet holding member.

渦電流式ダンパに振動が加えられると、ねじ軸が磁石保持部材の内側に進入したり、退出したりする。すなわち、渦電流式ダンパに振動が加えられると、磁石保持部材が正転、逆転を繰り返す。この場合、磁石保持部材が正転したとき、第１永久磁石の通風路と隣接する方の側面が、通風路内に空気の流れを生じさせる。磁石保持部材が逆転したとき、第２永久磁石の通風路と隣接する方の側面が、通風路内に空気の流れを生じさせる。したがって、磁石保持部材の正転時も逆転時も冷却効果が発揮され、第１永久磁石、第２永久磁石及び導電部材の過度な温度上昇が十分に抑制される。 When vibration is applied to the eddy current damper, the screw shaft moves in and out of the magnet holding member. That is, when vibration is applied to the eddy current type damper, the magnet holding member repeats forward rotation and reverse rotation. In this case, when the magnet holding member rotates in the normal direction, the side surface of the first permanent magnet adjacent to the ventilation path causes an air flow in the ventilation path. When the magnet holding member is reversed, the side surface of the second permanent magnet adjacent to the ventilation path causes an air flow in the ventilation path. Therefore, the cooling effect is exhibited both in the forward rotation and the reverse rotation of the magnet holding member, and the excessive temperature rise of the first permanent magnet, the second permanent magnet, and the conductive member is sufficiently suppressed.

（３）上記（１）の渦電流式ダンパはさらに、第３永久磁石と、第４永久磁石とを備えるのが好ましい。第３永久磁石は、通風路に沿って第１永久磁石に隣接し、磁石保持部材に固定される。第４永久磁石は、通風路に沿って第２永久磁石に隣接し、磁石保持部材の円周方向において通風路を挟んで第３永久磁石に隣接し、磁石保持部材に固定され、第３永久磁石と磁極の配置が反転している。 (3) It is preferable that the eddy current type damper of the above (1) further includes a third permanent magnet and a fourth permanent magnet. The third permanent magnet is adjacent to the first permanent magnet along the ventilation path and is fixed to the magnet holding member. The fourth permanent magnet is adjacent to the second permanent magnet along the ventilation path, is adjacent to the third permanent magnet across the ventilation path in the circumferential direction of the magnet holding member, is fixed to the magnet holding member, and is fixed to the third permanent magnet. The arrangement of magnets and magnetic poles is reversed.

（４）上記（３）の渦電流式ダンパはさらに、第５永久磁石と、第６永久磁石とを備えるのが好ましい。この場合、通風路は、磁石保持部材の軸方向に対し傾斜した入側通風路と、入側通風路の延びる方向に対し傾斜した出側通風路と、を含む。第１永久磁石は、磁石保持部材の円周方向において入側通風路を挟んで第２永久磁石と隣接する。第３永久磁石は、磁石保持部材の円周方向において入側通風路と出側通風路との境界で通風路を挟んで第４永久磁石と隣接する。第５永久磁石は、出側通風路に沿って第３永久磁石に隣接し、磁石保持部材に固定される。第６永久磁石は、出側通風路に沿って第４永久磁石に隣接し、磁石保持部材の円周方向において出側通風路を挟んで第５永久磁石に隣接し、磁石保持部材に固定され、第５永久磁石と磁極の配置が反転している。 (4) It is preferable that the eddy current type damper of the above (3) further includes a fifth permanent magnet and a sixth permanent magnet. In this case, the ventilation passage includes an inlet side ventilation passage inclined with respect to the axial direction of the magnet holding member and an outlet side ventilation passage inclined with respect to the extending direction of the inlet side ventilation passage. The first permanent magnet is adjacent to the second permanent magnet with the inlet side ventilation path interposed therebetween in the circumferential direction of the magnet holding member. The third permanent magnet is adjacent to the fourth permanent magnet across the ventilation path at the boundary between the inlet side ventilation path and the exit side ventilation path in the circumferential direction of the magnet holding member. The fifth permanent magnet is adjacent to the third permanent magnet along the outlet side ventilation path and is fixed to the magnet holding member. The sixth permanent magnet is adjacent to the fourth permanent magnet along the exit side ventilation path, is adjacent to the fifth permanent magnet across the exit side ventilation path in the circumferential direction of the magnet holding member, and is fixed to the magnet holding member. , The arrangement of the 5th permanent magnet and the magnetic pole is reversed.

上記（３）及び（４）の構成によれば、通風路に沿って複数の永久磁石が配列される。したがって、１つの永久磁石のサイズが小さくても、渦電流式ダンパの減衰力は十分に発揮される。これにより、各永久磁石のサイズが小さくて済み、渦電流式ダンパの生産効率が向上する。 According to the configurations (3) and (4) above, a plurality of permanent magnets are arranged along the ventilation path. Therefore, even if the size of one permanent magnet is small, the damping force of the eddy current type damper is sufficiently exhibited. As a result, the size of each permanent magnet can be reduced, and the production efficiency of the eddy current type damper is improved.

（５）上記（１）〜（４）の渦電流式ダンパはさらに、磁石保持部材に固定されたフィンを備えるのが好ましい。 (5) It is preferable that the eddy current type dampers (1) to (4) above further include fins fixed to the magnet holding member.

このような構成によれば、磁石保持部材が回転すれば、フィンも回転する。したがって、渦電流式ダンパ内の空気がより拡散され、各永久磁石及び導電部材の過度な温度上昇がさらに抑制される。 According to such a configuration, when the magnet holding member rotates, the fins also rotate. Therefore, the air in the eddy current damper is more diffused, and the excessive temperature rise of each permanent magnet and the conductive member is further suppressed.

（６）上記（１）〜（５）の渦電流式ダンパはさらに、導電部材に固定されたフィンを備えるのが好ましい。 (6) The eddy current type dampers (1) to (5) above preferably further include fins fixed to a conductive member.

このような構成によれば、フィンは渦電流式ダンパ内の熱を吸収又は放熱する。これにより、各永久磁石及び導電部材の過度な温度上昇がさらに抑制される。 According to such a configuration, the fin absorbs or dissipates heat in the eddy current damper. As a result, an excessive temperature rise of each permanent magnet and the conductive member is further suppressed.

以下、図面を参照して、本実施形態の渦電流式ダンパについて説明する。 Hereinafter, the eddy current type damper of the present embodiment will be described with reference to the drawings.

［第１実施形態］
図１は、渦電流式ダンパの軸方向の断面図である。図２は、図１の一部拡大図である。図１及び図２を参照して、渦電流式ダンパ１は、ねじ軸２と、ボールナット３と、磁石保持部材４と、通風路５と、第１永久磁石６と、第２永久磁石７と、導電部材８と、を含む。 [First Embodiment]
FIG. 1 is a cross-sectional view of the eddy current type damper in the axial direction. FIG. 2 is a partially enlarged view of FIG. With reference to FIGS. 1 and 2, the eddy current damper 1 includes a screw shaft 2, a ball nut 3, a magnet holding member 4, a ventilation path 5, a first permanent magnet 6, and a second permanent magnet 7. And the conductive member 8.

［ねじ軸］
ねじ軸２の外周面には、ねじ部が形成されている。ねじ軸２は、中心軸を含む。ねじ軸２は、中心軸方向に延びる。ねじ軸２は、ボールナット３を貫通し、ボールを介してボールナット３とかみ合う。 [Screw shaft]
A screw portion is formed on the outer peripheral surface of the screw shaft 2. The screw shaft 2 includes a central shaft. The screw shaft 2 extends in the direction of the central axis. The screw shaft 2 penetrates the ball nut 3 and meshes with the ball nut 3 via the ball.

［ボールナット］
ボールナット３は、ねじ軸２とかみ合う。ボールナット３の内周面には、ねじ軸２とかみ合うねじ部が形成されている。ボールナット３は、磁石保持部材４及び導電部材８の内部に配置される。ボールナット３の種類は、特に限定されない。ボールナット３は、周知のボールナットを用いてよい。 [Ball nut]
The ball nut 3 meshes with the screw shaft 2. A screw portion that meshes with the screw shaft 2 is formed on the inner peripheral surface of the ball nut 3. The ball nut 3 is arranged inside the magnet holding member 4 and the conductive member 8. The type of ball nut 3 is not particularly limited. As the ball nut 3, a well-known ball nut may be used.

すなわち、ねじ軸２及びボールナット３は、ボールねじを構成する。ボールねじは、ねじ軸２の軸方向の並進運動をボールナット３の回転運動に変換する。ねじ軸２には取付具１５が接続される。ねじ軸２と一体の取付具１５は、建物支持面又は建物内に固定される。渦電流式ダンパ１が、たとえば建物内と建物支持面との間の免震層に設置される事例の場合、ねじ軸２と一体の取付具１５が建物内に固定され、導電部材８と一体の取付具１４は建物支持面に固定される。渦電流式ダンパ１が、たとえば建物内の任意の層間に設置される事例の場合は、ねじ軸２と一体の取付具１５が任意の層間の上部梁側に固定され、導電部材８と一体の取付具１４は任意の層間の下部梁側に固定される。そのため、ねじ軸２はその中心軸周りに回転しない。 That is, the screw shaft 2 and the ball nut 3 form a ball screw. The ball screw converts the translational motion of the screw shaft 2 in the axial direction into the rotational motion of the ball nut 3. A fixture 15 is connected to the screw shaft 2. The fixture 15 integrated with the screw shaft 2 is fixed to the building support surface or the inside of the building. In the case where the eddy current type damper 1 is installed in the seismic isolation layer between the inside of the building and the building support surface, for example, the fixture 15 integrated with the screw shaft 2 is fixed inside the building and integrated with the conductive member 8. Fixture 14 is fixed to the building support surface. In the case where the eddy current type damper 1 is installed between arbitrary layers in the building, for example, the fixture 15 integrated with the screw shaft 2 is fixed to the upper beam side between the arbitrary layers and is integrated with the conductive member 8. The fixture 14 is fixed to the lower beam side between any layers. Therefore, the screw shaft 2 does not rotate around its central axis.

ねじ軸２と一体の取付具１５及び導電部材８と一体の取付具１４の固定は、上述の説明の逆であってもよい。すなわち、ねじ軸２と一体の取付具１５が建物支持面に固定され、導電部材８と一体の取付具１４が建物内に固定されてもよい。 The fixing of the fixture 15 integrated with the screw shaft 2 and the fixture 14 integrated with the conductive member 8 may be the reverse of the above description. That is, the fixture 15 integrated with the screw shaft 2 may be fixed to the building support surface, and the fixture 14 integrated with the conductive member 8 may be fixed in the building.

ねじ軸２は、磁石保持部材４及び導電部材８の内部に軸方向に沿って進出又は退出可能である。したがって、振動等により、渦電流式ダンパ１に運動エネルギが与えられると、ねじ軸２が軸方向に移動する。ねじ軸２が軸方向に移動すれば、ボールねじの機能によってボールナット３がねじ軸の中心軸周りに回転する。ボールナット３の回転に伴い、ボールナット３に固定された磁石保持部材４が回転する。これにより、磁石保持部材４と一体の第１永久磁石６及び第２永久磁石７が導電部材８に対して相対回転するため、導電部材８には渦電流が発生する。その結果、渦電流式ダンパ１に減衰力が生じ、振動を減衰させる。渦電流の発生メカニズムについては後に詳述する。 The screw shaft 2 can move forward or backward along the axial direction inside the magnet holding member 4 and the conductive member 8. Therefore, when kinetic energy is applied to the eddy current type damper 1 due to vibration or the like, the screw shaft 2 moves in the axial direction. When the screw shaft 2 moves in the axial direction, the ball nut 3 rotates around the central axis of the screw shaft by the function of the ball screw. As the ball nut 3 rotates, the magnet holding member 4 fixed to the ball nut 3 rotates. As a result, the first permanent magnet 6 and the second permanent magnet 7 integrated with the magnet holding member 4 rotate relative to the conductive member 8, so that an eddy current is generated in the conductive member 8. As a result, a damping force is generated in the eddy current type damper 1, and the vibration is damped. The mechanism of generating eddy currents will be described in detail later.

［磁石保持部材］
磁石保持部材４は、ねじ軸２を中心軸とする円筒形状である。磁石保持部材４は、ボールナット３及びねじ軸２を収容可能である。磁石保持部材４の材質は、特に限定されない。しかしながら、磁石保持部材４の材質は、透磁率の高い鋼等が好ましい。磁石保持部材４の材質はたとえば、炭素鋼、鋳鉄等の強磁性体である。この場合、磁石保持部材４は、ヨークとしての役割を果たす。すなわち、第１永久磁石６及び第２永久磁石７からの磁束が外部に漏れにくくなり、渦電流式ダンパ１の減衰力が高まる。 [Magnet holding member]
The magnet holding member 4 has a cylindrical shape with the screw shaft 2 as the central axis. The magnet holding member 4 can accommodate the ball nut 3 and the screw shaft 2. The material of the magnet holding member 4 is not particularly limited. However, the material of the magnet holding member 4 is preferably steel or the like having a high magnetic permeability. The material of the magnet holding member 4 is, for example, a ferromagnetic material such as carbon steel or cast iron. In this case, the magnet holding member 4 serves as a yoke. That is, the magnetic fluxes from the first permanent magnet 6 and the second permanent magnet 7 are less likely to leak to the outside, and the damping force of the eddy current type damper 1 is increased.

磁石保持部材４は、ボールナット３に固定される。したがって、ボールナット３が回転すれば、磁石保持部材４も回転する。また、後述するように、磁石保持部材４は導電部材８に対して回転可能である。 The magnet holding member 4 is fixed to the ball nut 3. Therefore, if the ball nut 3 rotates, the magnet holding member 4 also rotates. Further, as will be described later, the magnet holding member 4 is rotatable with respect to the conductive member 8.

［通風路］
図３は、通風路を示す斜視図である。図３を参照して、通風路５は、磁石保持部材４の外周面に設けられる。通風路５は、磁石保持部材４の外周面、第１永久磁石６の第１側面９及び第２永久磁石７の第２側面１０によって形成される領域である。通風路５は、磁石保持部材４の軸方向Ｃにおいて、第１永久磁石６の一方の端から他方の端まで延びる。ただし、通風路５は、磁石保持部材４の軸方向Ｃに対し傾斜する。このような構成により、導電部材、第１永久磁石６及び第２永久磁石７に発生した熱を拡散させることができる。以下、この点について詳述する。 [Ventilation path]
FIG. 3 is a perspective view showing a ventilation path. With reference to FIG. 3, the ventilation passage 5 is provided on the outer peripheral surface of the magnet holding member 4. The ventilation passage 5 is a region formed by the outer peripheral surface of the magnet holding member 4, the first side surface 9 of the first permanent magnet 6, and the second side surface 10 of the second permanent magnet 7. The ventilation passage 5 extends from one end of the first permanent magnet 6 to the other end in the axial direction C of the magnet holding member 4. However, the ventilation passage 5 is inclined with respect to the axial direction C of the magnet holding member 4. With such a configuration, the heat generated in the conductive member, the first permanent magnet 6 and the second permanent magnet 7 can be diffused. This point will be described in detail below.

磁石保持部材４が図３中の白抜き矢印の方向に回転する場合について説明する。通風路５を形成する第１永久磁石の第１側面９は通風路５に沿うため、第１側面９は磁石保持部材４の軸方向Ｃに対し傾斜している。そのため、第１側面９の一方の端は、磁石保持部材４の回転方向において他方の端に対して先行する。磁石保持部材４が回転すると、第１側面９の先行する端から他方の端に向けて空気が流れる（図３中の黒塗り矢印参照）。この空気の流れにより、導電部材、第１永久磁石６及び第２永久磁石７に発生した熱が渦電流式ダンパ内に拡散される。渦電流式ダンパは多くの部品により構成されるため、拡散された熱が第１永久磁石、第２永久磁石及び導電部材以外の部品に伝達される。これにより、導電部材、第１永久磁石６及び第２永久磁石７の過度の温度上昇が抑制される。 A case where the magnet holding member 4 rotates in the direction of the white arrow in FIG. 3 will be described. Since the first side surface 9 of the first permanent magnet forming the ventilation path 5 is along the ventilation path 5, the first side surface 9 is inclined with respect to the axial direction C of the magnet holding member 4. Therefore, one end of the first side surface 9 precedes the other end in the rotation direction of the magnet holding member 4. When the magnet holding member 4 rotates, air flows from the preceding end of the first side surface 9 toward the other end (see the black arrow in FIG. 3). Due to this air flow, the heat generated in the conductive member, the first permanent magnet 6 and the second permanent magnet 7 is diffused in the eddy current type damper. Since the eddy current damper is composed of many parts, the diffused heat is transferred to parts other than the first permanent magnet, the second permanent magnet and the conductive member. As a result, an excessive temperature rise of the conductive member, the first permanent magnet 6 and the second permanent magnet 7 is suppressed.

磁石保持部材４が、図３中の白抜き矢印と反対方向に回転する場合も同様である。ねじ軸２が磁石保持部材４の内部に進入する場合と、退出する場合とで磁石保持部材の回転方向は異なる。磁石保持部材４が図３中の白抜き矢印と反対方向に回転する場合、第２側面１０の一方の端が磁石保持部材の回転方向において他方の端に対し先行する。すなわち、第２永久磁石７の第２側面１０が空気の流れを生じさせる。この場合、通風路５間の空気の流れは、図３中の黒塗り矢印と反対方向となる。 The same applies when the magnet holding member 4 rotates in the direction opposite to the white arrow in FIG. The rotation direction of the magnet holding member differs depending on whether the screw shaft 2 enters the inside of the magnet holding member 4 or exits the magnet holding member 4. When the magnet holding member 4 rotates in the direction opposite to the white arrow in FIG. 3, one end of the second side surface 10 precedes the other end in the rotation direction of the magnet holding member. That is, the second side surface 10 of the second permanent magnet 7 causes an air flow. In this case, the air flow between the ventilation passages 5 is in the opposite direction to the black arrow in FIG.

要するに、第１実施形態の渦電流式ダンパによれば、磁石保持部材が正転する場合も反転する場合も通風路に空気が流れるため、導電部材８、第１永久磁石６及び第２永久磁石７の過度の温度上昇が抑制される。 In short, according to the eddy current type damper of the first embodiment, since air flows in the ventilation path regardless of whether the magnet holding member rotates forward or reverse, the conductive member 8, the first permanent magnet 6, and the second permanent magnet The excessive temperature rise of 7 is suppressed.

［第１永久磁石及び第２永久磁石］
図３を参照して、第１永久磁石６は、磁石保持部材４の円周方向において通風路５に隣接する。上述したように、第１永久磁石６は通風路５を形成するからである。第１永久磁石６は、磁石保持部材４の外周面に固定される。 [1st permanent magnet and 2nd permanent magnet]
With reference to FIG. 3, the first permanent magnet 6 is adjacent to the ventilation passage 5 in the circumferential direction of the magnet holding member 4. This is because, as described above, the first permanent magnet 6 forms the ventilation passage 5. The first permanent magnet 6 is fixed to the outer peripheral surface of the magnet holding member 4.

第２永久磁石７も、第１永久磁石６と同様である。第２永久磁石７は、磁石保持部材４の円周方向において通風路５に隣接する。第２永久磁石７も通風路５を形成するからである。また、第２永久磁石７は、磁石保持部材４の円周方向において通風路５を挟んで第１永久磁石６に隣接する。換言すれば、第１永久磁石６は、磁石保持部材４の円周方向において隙間を空けて第２永久磁石７と隣接する。この隙間が通風路５に相当する。 The second permanent magnet 7 is the same as the first permanent magnet 6. The second permanent magnet 7 is adjacent to the ventilation passage 5 in the circumferential direction of the magnet holding member 4. This is because the second permanent magnet 7 also forms the ventilation passage 5. Further, the second permanent magnet 7 is adjacent to the first permanent magnet 6 with the ventilation passage 5 interposed therebetween in the circumferential direction of the magnet holding member 4. In other words, the first permanent magnet 6 is adjacent to the second permanent magnet 7 with a gap in the circumferential direction of the magnet holding member 4. This gap corresponds to the ventilation passage 5.

第１永久磁石６の磁極面の平面形状は、平行四辺形である。磁石保持部材４の円周方向の第１永久磁石６の辺の長さは、磁石保持部材４の軸方向Ｃの第１永久磁石６の辺の長さよりも長い。第１永久磁石６のサイズは特に限定されない。しかしながら、導電部材に発生させる渦電流の大きさが大きければ、渦電流式ダンパの減衰力は高まる。したがって、減衰力の観点からは、第１永久磁石６のサイズは大きい方が好ましい。たとえば、第１永久磁石６の磁石保持部材４の軸方向Ｃの長さは、磁石保持部材４の軸方向Ｃの長さの８０％以上であるのが好ましい。 The planar shape of the magnetic pole surface of the first permanent magnet 6 is a parallelogram. The length of the side of the first permanent magnet 6 in the circumferential direction of the magnet holding member 4 is longer than the length of the side of the first permanent magnet 6 in the axial direction C of the magnet holding member 4. The size of the first permanent magnet 6 is not particularly limited. However, if the magnitude of the eddy current generated in the conductive member is large, the damping force of the eddy current type damper increases. Therefore, from the viewpoint of damping force, it is preferable that the size of the first permanent magnet 6 is large. For example, the length of the magnet holding member 4 of the first permanent magnet 6 in the axial direction C is preferably 80% or more of the length of the magnet holding member 4 in the axial direction C.

しかしながら、第１永久磁石６の形状は特に限定されるものではない。第１永久磁石６の磁極面の平面形状は、長方形であってもよい。第２永久磁石７のサイズ及び特質は第１永久磁石６のサイズ及び特質と同じである。そのため、第２永久磁石の形状等についての説明は省略する。 However, the shape of the first permanent magnet 6 is not particularly limited. The planar shape of the magnetic pole surface of the first permanent magnet 6 may be rectangular. The size and characteristics of the second permanent magnet 7 are the same as the size and characteristics of the first permanent magnet 6. Therefore, the description of the shape of the second permanent magnet and the like will be omitted.

図４は、渦電流式ダンパの軸方向に垂直な断面図である。図４を参照して、磁石保持部材４に複数の第１永久磁石６及び複数の第２永久磁石７が固定される場合を示す。この場合、隙間を空けて隣接する２つの第１永久磁石６の間に１つの第２永久磁石７が配置される。すなわち、第１永久磁石６及び第２永久磁石７は、磁石保持部材４の円周方向に交互に配列される。 FIG. 4 is a cross-sectional view perpendicular to the axial direction of the eddy current type damper. With reference to FIG. 4, a case where a plurality of first permanent magnets 6 and a plurality of second permanent magnets 7 are fixed to the magnet holding member 4 is shown. In this case, one second permanent magnet 7 is arranged between two adjacent first permanent magnets 6 with a gap. That is, the first permanent magnets 6 and the second permanent magnets 7 are alternately arranged in the circumferential direction of the magnet holding member 4.

図５は、図４の一部拡大図である。図５を参照して、第１永久磁石６及び第２永久磁石７の磁極は、磁石保持部材４の径方向に配置される。第２永久磁石７の磁極の配置は第１永久磁石６の磁極の配置と反転している。具体的には、磁石保持部材４の径方向において、第１永久磁石６のＮ極は外側に配置され、Ｓ極は内側に配置される。そのため、第１永久磁石６のＳ極が磁石保持部材４と接する。一方、磁石保持部材４の径方向において、第２永久磁石７のＮ極は内側に配置され、そのＳ極は外側に配置される。そのため、第２永久磁石７のＮ極が磁石保持部材４と接する。 FIG. 5 is a partially enlarged view of FIG. With reference to FIG. 5, the magnetic poles of the first permanent magnet 6 and the second permanent magnet 7 are arranged in the radial direction of the magnet holding member 4. The arrangement of the magnetic poles of the second permanent magnet 7 is reversed from the arrangement of the magnetic poles of the first permanent magnet 6. Specifically, in the radial direction of the magnet holding member 4, the north pole of the first permanent magnet 6 is arranged on the outside, and the south pole is arranged on the inside. Therefore, the S pole of the first permanent magnet 6 comes into contact with the magnet holding member 4. On the other hand, in the radial direction of the magnet holding member 4, the north pole of the second permanent magnet 7 is arranged inside, and the south pole thereof is arranged outside. Therefore, the north pole of the second permanent magnet 7 comes into contact with the magnet holding member 4.

第１永久磁石６及び第２永久磁石７はたとえば、接着剤により磁石保持部材４に固定される。なお、接着剤に限らず、第１永久磁石６及び第２永久磁石７はネジ等で固定されてもよいことはもちろんである。 The first permanent magnet 6 and the second permanent magnet 7 are fixed to the magnet holding member 4 by, for example, an adhesive. It goes without saying that the first permanent magnet 6 and the second permanent magnet 7 may be fixed with screws or the like, not limited to the adhesive.

［導電部材］
図１を参照して、導電部材８は、ねじ軸２を中心軸とする円筒形状である。導電部材８は、磁石保持部材４、第１永久磁石６、第２永久磁石７、ボールナット３及びねじ軸２を収容可能である。つまり、磁石保持部材４が導電部材８の内側に同心状に配置される。 [Conductive member]
With reference to FIG. 1, the conductive member 8 has a cylindrical shape with the screw shaft 2 as the central axis. The conductive member 8 can accommodate a magnet holding member 4, a first permanent magnet 6, a second permanent magnet 7, a ball nut 3, and a screw shaft 2. That is, the magnet holding member 4 is arranged concentrically inside the conductive member 8.

図５を参照して、導電部材８の内周面は、第１永久磁石６及び第２永久磁石７と隙間を空けて対向する。後述するように、導電部材８の表面（内周面）に渦電流を発生させるため、導電部材８は磁石保持部材４と相対的に回転する。干渉を回避するため、導電部材８と第１永久磁石６及び第２永久磁石７との間には、隙間が設けられる。導電部材８と一体の取付具は、建物支持面又は建物内に固定される。そのため、導電部材８はねじ軸２周りに回転しない。 With reference to FIG. 5, the inner peripheral surface of the conductive member 8 faces the first permanent magnet 6 and the second permanent magnet 7 with a gap. As will be described later, in order to generate an eddy current on the surface (inner peripheral surface) of the conductive member 8, the conductive member 8 rotates relative to the magnet holding member 4. In order to avoid interference, a gap is provided between the conductive member 8 and the first permanent magnet 6 and the second permanent magnet 7. The fixture integrated with the conductive member 8 is fixed to the building support surface or the inside of the building. Therefore, the conductive member 8 does not rotate around the screw shaft 2.

導電部材は、導電性を有する。導電部材の材質はたとえば、炭素鋼、鋳鉄等の強磁性体である。その他に、導電部材の材質は、フェライト系ステンレス鋼等の弱磁性体であってもよいし、アルミニウム合金、オーステナイト系ステンレス鋼、銅合金等の非磁性体であってもよい。 The conductive member has conductivity. The material of the conductive member is, for example, a ferromagnetic material such as carbon steel or cast iron. In addition, the material of the conductive member may be a weak magnetic material such as ferritic stainless steel, or a non-magnetic material such as an aluminum alloy, austenitic stainless steel, or copper alloy.

図１を参照して、導電部材８は磁石保持部材４を回転可能に支持する。磁石保持部材４の径方向において、磁石保持部材４と導電部材８との間には、ラジアル軸受１６が設けられる。また、磁石保持部材４の軸方向において、磁石保持部材４と導電部材８との間には、スラスト軸受１７が設けられる。なお、ラジアル軸受やスラスト軸受の種類は、特に限定されることなく、ボール式、ローラー式、滑り式などでもよいことはもちろんである。 With reference to FIG. 1, the conductive member 8 rotatably supports the magnet holding member 4. A radial bearing 16 is provided between the magnet holding member 4 and the conductive member 8 in the radial direction of the magnet holding member 4. Further, in the axial direction of the magnet holding member 4, a thrust bearing 17 is provided between the magnet holding member 4 and the conductive member 8. The types of radial bearings and thrust bearings are not particularly limited, and of course, ball type, roller type, sliding type and the like may be used.

続いて、渦電流の発生原理及び渦電流による減衰力の発生原理について説明する。 Next, the principle of generating eddy current and the principle of generating damping force by eddy current will be described.

［渦電流による減衰力］
図６は、渦電流式ダンパの磁気回路を示す模式図である。図６を参照して、第１永久磁石６の磁極の配置は、隣接する第２永久磁石７の磁極の配置と反転している。したがって、第１永久磁石６のＮ極から出た磁束は、隣接する第２永久磁石７のＳ極に到達する。第２永久磁石７のＮ極から出た磁束は、隣接する第１永久磁石６のＳ極に到達する。これにより、第１永久磁石６、第２永久磁石７、導電部材８及び磁石保持部材４の中で、磁気回路が形成される。第１永久磁石６及び第２永久磁石７と、導電部材８との間の隙間は十分に小さいため、導電部材８は磁界の中にある。 [Attenuation force due to eddy current]
FIG. 6 is a schematic view showing a magnetic circuit of an eddy current type damper. With reference to FIG. 6, the arrangement of the magnetic poles of the first permanent magnet 6 is reversed from the arrangement of the magnetic poles of the adjacent second permanent magnets 7. Therefore, the magnetic flux emitted from the north pole of the first permanent magnet 6 reaches the south pole of the adjacent second permanent magnet 7. The magnetic flux emitted from the north pole of the second permanent magnet 7 reaches the south pole of the adjacent first permanent magnet 6. As a result, a magnetic circuit is formed in the first permanent magnet 6, the second permanent magnet 7, the conductive member 8, and the magnet holding member 4. Since the gap between the first permanent magnets 6 and the second permanent magnets 7 and the conductive member 8 is sufficiently small, the conductive member 8 is in a magnetic field.

磁石保持部材４が回転すると（図６中の矢印参照）、第１永久磁石６及び第２永久磁石７は導電部材８に対して移動する。そのため、導電部材８の表面（図６では第１永久磁石６及び第２永久磁石７が対向する導電部材８の内周面）を通過する磁束が変化する。これにより導電部材８の表面に渦電流が発生する。渦電流が発生すると、新たな磁束（反磁界）が発生する。この新たな磁束は、磁石保持部材４と導電部材８との相対回転を妨げる。すなわち、磁石保持部材４の回転が妨げられる。磁石保持部材４の回転が妨げられれば、磁石保持部材４に固定されたボールナット３の回転も妨げられる。ボールナット３の回転が妨げられれば、ねじ軸２の軸方向の移動も妨げられる。これが渦電流式ダンパ１の減衰力である。振動等による運動エネルギにより発生する渦電流は、導電部材の温度を上昇させる。すなわち、渦電流式ダンパに与えられた運動エネルギが熱エネルギに変換され、減衰力が得られる。 When the magnet holding member 4 rotates (see the arrow in FIG. 6), the first permanent magnet 6 and the second permanent magnet 7 move with respect to the conductive member 8. Therefore, the magnetic flux passing through the surface of the conductive member 8 (in FIG. 6, the inner peripheral surface of the conductive member 8 on which the first permanent magnet 6 and the second permanent magnet 7 face each other) changes. As a result, an eddy current is generated on the surface of the conductive member 8. When an eddy current is generated, a new magnetic flux (demagnetic field) is generated. This new magnetic flux hinders the relative rotation of the magnet holding member 4 and the conductive member 8. That is, the rotation of the magnet holding member 4 is hindered. If the rotation of the magnet holding member 4 is hindered, the rotation of the ball nut 3 fixed to the magnet holding member 4 is also hindered. If the rotation of the ball nut 3 is hindered, the axial movement of the screw shaft 2 is also hindered. This is the damping force of the eddy current damper 1. Eddy currents generated by kinetic energy due to vibration or the like raise the temperature of the conductive member. That is, the kinetic energy given to the eddy current type damper is converted into thermal energy, and a damping force is obtained.

［第２実施形態］
第２実施形態の渦電流式ダンパは、第１実施形態と比べて、第１永久磁石及び第２永久磁石の形状が異なる。また、第２実施形態の渦電流式ダンパは、第１実施形態の渦電流式ダンパの構成に加えてさらに、第３永久磁石及び第４永久磁石を含む。なお、第２実施形態の渦電流式ダンパにおいて、第１実施形態の渦電流式ダンパと同じ構成は説明を省略する。 [Second Embodiment]
The eddy current type damper of the second embodiment has different shapes of the first permanent magnet and the second permanent magnet as compared with the first embodiment. Further, the eddy current type damper of the second embodiment further includes a third permanent magnet and a fourth permanent magnet in addition to the configuration of the eddy current type damper of the first embodiment. In the eddy current type damper of the second embodiment, the same configuration as the eddy current type damper of the first embodiment will not be described.

図７は、第２実施形態の第１永久磁石〜第４永久磁石を示す斜視図である。図７を参照して、渦電流式ダンパは、第１永久磁石６と、第２永久磁石７と、第３永久磁石１８と、第４永久磁石１９とを含む。第１永久磁石６の磁極面の平面形状は正方形である。第１永久磁石６の磁極面の１辺の長さは、磁石保持部材４の軸方向Ｃの長さの１／３よりも短い。要するに、第２実施形態の第１永久磁石６は、第１実施形態の第１永久磁石よりも小さい。サイズの小さい第１永久磁石６を用いることによって、第１永久磁石の製造が容易になる。また、第１永久磁石６として汎用の永久磁石を用いることもできる。そのため、第２実施形態の渦電流式ダンパは、生産効率が高い。第１永久磁石、第２永久磁石、第３永久磁石及び第４永久磁石は、同じ形状、特性の永久磁石である。 FIG. 7 is a perspective view showing the first permanent magnets to the fourth permanent magnets of the second embodiment. With reference to FIG. 7, the eddy current damper includes a first permanent magnet 6, a second permanent magnet 7, a third permanent magnet 18, and a fourth permanent magnet 19. The planar shape of the magnetic pole surface of the first permanent magnet 6 is square. The length of one side of the magnetic pole surface of the first permanent magnet 6 is shorter than one-third of the length of the magnet holding member 4 in the axial direction C. In short, the first permanent magnet 6 of the second embodiment is smaller than the first permanent magnet of the first embodiment. By using the first permanent magnet 6 having a small size, the production of the first permanent magnet becomes easy. Further, a general-purpose permanent magnet can be used as the first permanent magnet 6. Therefore, the eddy current type damper of the second embodiment has high production efficiency. The first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet are permanent magnets having the same shape and characteristics.

第１永久磁石６及び第２永久磁石７の配置は、第１実施形態と同様である。すなわち、第１永久磁石６は、通風路５を挟んで磁石保持部材４の円周方向に第２永久磁石７と隣接する。第１永久磁石６の磁極の配置は、第２永久磁石７の磁極の配置と反転している。 The arrangement of the first permanent magnet 6 and the second permanent magnet 7 is the same as that of the first embodiment. That is, the first permanent magnet 6 is adjacent to the second permanent magnet 7 in the circumferential direction of the magnet holding member 4 with the ventilation passage 5 interposed therebetween. The arrangement of the magnetic poles of the first permanent magnet 6 is reversed from the arrangement of the magnetic poles of the second permanent magnet 7.

第３永久磁石１８は、磁石保持部材４の外周面に固定される。第３永久磁石１８は、通風路５に沿って第１永久磁石６に隣接する。通風路５は、磁石保持部材４の軸方向に対し傾斜する。第２実施形態において、通風路５は、磁石保持部材４の外周面、第１永久磁石６、第２永久磁石７、第３永久磁石１８及び第４永久磁石１９によって形成される。通風路５は磁石保持部材４の軸方向Ｃに対し傾斜しているため、第３永久磁石１８は、磁石保持部材４の円周方向において第１永久磁石６からずれた位置に配置される。 The third permanent magnet 18 is fixed to the outer peripheral surface of the magnet holding member 4. The third permanent magnet 18 is adjacent to the first permanent magnet 6 along the ventilation path 5. The ventilation passage 5 is inclined with respect to the axial direction of the magnet holding member 4. In the second embodiment, the ventilation passage 5 is formed by the outer peripheral surface of the magnet holding member 4, the first permanent magnet 6, the second permanent magnet 7, the third permanent magnet 18, and the fourth permanent magnet 19. Since the ventilation path 5 is inclined with respect to the axial direction C of the magnet holding member 4, the third permanent magnet 18 is arranged at a position deviated from the first permanent magnet 6 in the circumferential direction of the magnet holding member 4.

第４永久磁石１９は、磁石保持部材４の外周面に固定される。第４永久磁石１９は、通風路５に沿って第２永久磁石７に隣接する。第４永久磁石１９は、磁石保持部材４の円周方向において第２永久磁石７からずれた位置に配置される。第４永久磁石１９は、磁石保持部材４の円周方向において通風路５を挟んで第３永久磁石１８に隣接する。このような構成により、通風路５は磁石保持部材４の軸方向に対し傾斜するため、第１実施形態と同様に、導電部材８、第１永久磁石６、第２永久磁石７、第３永久磁石１８及び第４永久磁石１９の過度の温度上昇が抑制される。 The fourth permanent magnet 19 is fixed to the outer peripheral surface of the magnet holding member 4. The fourth permanent magnet 19 is adjacent to the second permanent magnet 7 along the ventilation passage 5. The fourth permanent magnet 19 is arranged at a position deviated from the second permanent magnet 7 in the circumferential direction of the magnet holding member 4. The fourth permanent magnet 19 is adjacent to the third permanent magnet 18 with the ventilation passage 5 interposed therebetween in the circumferential direction of the magnet holding member 4. With such a configuration, the ventilation passage 5 is inclined with respect to the axial direction of the magnet holding member 4, so that the conductive member 8, the first permanent magnet 6, the second permanent magnet 7, and the third permanent magnet are the same as in the first embodiment. Excessive temperature rise of the magnet 18 and the fourth permanent magnet 19 is suppressed.

また、第４永久磁石１９の磁極の配置は、第３永久磁石１８の磁極の配置と反転している。そのため、第３永久磁石１８、第４永久磁石１９、導電部材８及び磁石保持部材４の中においても、磁気回路が形成される。したがって、永久磁石のサイズが小さくても、渦電流式ダンパの減衰力は、第１実施形態と比べても劣らない。 Further, the arrangement of the magnetic poles of the fourth permanent magnet 19 is reversed from the arrangement of the magnetic poles of the third permanent magnet 18. Therefore, a magnetic circuit is also formed in the third permanent magnet 18, the fourth permanent magnet 19, the conductive member 8, and the magnet holding member 4. Therefore, even if the size of the permanent magnet is small, the damping force of the eddy current type damper is not inferior to that of the first embodiment.

上述の説明では、磁石保持部材４の円周方向において、通風路５の片側に第１永久磁石６及び第３永久磁石１８が配置される場合を説明した。しかしながら、第２実施形態の渦電流式ダンパはこれに限定されない。図７に示すように、通風路５に沿って第３永久磁石１８に隣接するさらなる永久磁石が設けられてもよい。第２永久磁石７及び第４永久磁石１９が配置された通風路５のもう一方の側においても同様である。ただし、渦電流を発生させるため、磁石保持部材４の円周方向において通風路５を挟んで隣接する２つの永久磁石の磁極の配置は互いに反転している。 In the above description, the case where the first permanent magnet 6 and the third permanent magnet 18 are arranged on one side of the ventilation path 5 in the circumferential direction of the magnet holding member 4 has been described. However, the eddy current type damper of the second embodiment is not limited to this. As shown in FIG. 7, an additional permanent magnet may be provided along the ventilation path 5 adjacent to the third permanent magnet 18. The same applies to the other side of the ventilation passage 5 in which the second permanent magnet 7 and the fourth permanent magnet 19 are arranged. However, in order to generate an eddy current, the arrangements of the magnetic poles of the two permanent magnets adjacent to each other with the ventilation passage 5 in the circumferential direction of the magnet holding member 4 are reversed from each other.

また、第１永久磁石６と第３永久磁石１８との間に隙間が設けられていてもよい。この場合、第１永久磁石６及び第３永久磁石１８が空気と接する面積が増えるため、第１永久磁石６及び第３永久磁石１８の過度な温度上昇がさらに抑制される。第２永久磁石７及び第４永久磁石１９においても同様である。 Further, a gap may be provided between the first permanent magnet 6 and the third permanent magnet 18. In this case, since the area where the first permanent magnet 6 and the third permanent magnet 18 are in contact with air increases, the excessive temperature rise of the first permanent magnet 6 and the third permanent magnet 18 is further suppressed. The same applies to the second permanent magnet 7 and the fourth permanent magnet 19.

なお、図７では、第３永久磁石１８の磁極の配置が第１永久磁石６の磁極の配置と同じである場合を示した。しかしながら、第３永久磁石１８の磁極の配置は、第１永久磁石６と異なってもよい。要するに、磁石保持部材４の円周方向において、通風路５を挟んで隣接する２つの永久磁石の磁極の配置が異なっていればよい。 Note that FIG. 7 shows a case where the arrangement of the magnetic poles of the third permanent magnet 18 is the same as the arrangement of the magnetic poles of the first permanent magnet 6. However, the arrangement of the magnetic poles of the third permanent magnet 18 may be different from that of the first permanent magnet 6. In short, the arrangement of the magnetic poles of the two permanent magnets adjacent to each other with the ventilation passage 5 in the circumferential direction of the magnet holding member 4 may be different.

［第３実施形態］
第３実施形態の渦電流式ダンパは、第２実施形態と比べて、通風路の形状が異なる。また、第３実施形態の渦電流式ダンパは、第２実施形態の渦電流式ダンパの構成に加えてさらに、第５永久磁石及び第６永久磁石を含む。なお、第３実施形態の渦電流式ダンパにおいて、上述の第１実施形態及び第２実施形態の渦電流式ダンパと同じ構成は説明を省略する。 [Third Embodiment]
The eddy current type damper of the third embodiment has a different shape of the ventilation path as compared with the second embodiment. Further, the eddy current type damper of the third embodiment further includes a fifth permanent magnet and a sixth permanent magnet in addition to the configuration of the eddy current type damper of the second embodiment. In the eddy current type damper of the third embodiment, the same configuration as the eddy current type damper of the first embodiment and the second embodiment described above will not be described.

図８は、第３実施形態の第１永久磁石〜第６永久磁石を示す斜視図である。図８を参照して、渦電流式ダンパは、第１永久磁石６と、第２永久磁石７と、第３永久磁石１８と、第４永久磁石１９と、第５永久磁石２０と、第６永久磁石２１とを含む。第３実施形態の各永久磁石のサイズは、第２実施形態と同様に小さい。したがって、渦電流式ダンパの生産効率が高い。第１永久磁石〜第６永久磁石は、同じ形状、特性の永久磁石である。 FIG. 8 is a perspective view showing the first permanent magnets to the sixth permanent magnets of the third embodiment. With reference to FIG. 8, the eddy current type damper includes a first permanent magnet 6, a second permanent magnet 7, a third permanent magnet 18, a fourth permanent magnet 19, a fifth permanent magnet 20, and a sixth permanent magnet. Includes a permanent magnet 21. The size of each permanent magnet in the third embodiment is as small as in the second embodiment. Therefore, the production efficiency of the eddy current type damper is high. The first permanent magnet to the sixth permanent magnet are permanent magnets having the same shape and characteristics.

通風路５は、磁石保持部材４の軸方向に対し傾斜している。通風路５は、途中で屈曲している。具体的には、第３実施形態の通風路５は、入側通風路１１と、出側通風路１２とを含む。入側通風路１１は、磁石保持部材４の軸方向Ｃに対し傾斜している。出側通風路１２は、入側通風路１１の延びる方向に対し傾斜している。すなわち、出側通風路１２の延びる方向は、磁石保持部材４の軸方向Ｃに対し傾斜していてもよいし、磁石保持部材４の軸方向Ｃと平行であってもよい。出側通風路１２の延びる方向は、入側通風路１１の延びる方向と交差していればよい。この場合であっても、磁石保持部材４が回転すれば、通風路５に空気が流れ、導電部材８及び各永久磁石の過度な温度上昇が抑制される。 The ventilation passage 5 is inclined with respect to the axial direction of the magnet holding member 4. The ventilation passage 5 is bent in the middle. Specifically, the ventilation passage 5 of the third embodiment includes an entrance side ventilation passage 11 and an exit side ventilation passage 12. The inlet ventilation passage 11 is inclined with respect to the axial direction C of the magnet holding member 4. The outlet side ventilation passage 12 is inclined with respect to the extending direction of the entrance side ventilation passage 11. That is, the extending direction of the exit side ventilation passage 12 may be inclined with respect to the axial direction C of the magnet holding member 4, or may be parallel to the axial direction C of the magnet holding member 4. The extending direction of the exit side ventilation passage 12 may intersect with the extension direction of the entrance side ventilation passage 11. Even in this case, if the magnet holding member 4 rotates, air flows through the ventilation passage 5, and an excessive temperature rise of the conductive member 8 and each permanent magnet is suppressed.

通風路５を形成する各永久磁石の配置は次のとおりである。第１永久磁石６、第２永久磁石７、第３永久磁石１８及び第４永久磁石１９の配置は第２実施形態と同様である。第１永久磁石６、第２永久磁石７、第３永久磁石１８及び第４永久磁石１９によって、入側通風路１１が形成される。第１永久磁石６は、磁石保持部材４の円周方向において入側通風路１１を挟んで第２永久磁石７と隣接する。第３永久磁石１８及び第４永久磁石１９は、入側通風路１１と出側通風路１２との境界に設けられる。すなわち、第３永久磁石１８は、磁石保持部材４の円周方向において入側通風路１１と出側通風路１２との境界で通風路５を挟んで第４永久磁石１９と隣接する。 The arrangement of each permanent magnet forming the ventilation passage 5 is as follows. The arrangement of the first permanent magnet 6, the second permanent magnet 7, the third permanent magnet 18, and the fourth permanent magnet 19 is the same as in the second embodiment. The inlet side ventilation passage 11 is formed by the first permanent magnet 6, the second permanent magnet 7, the third permanent magnet 18, and the fourth permanent magnet 19. The first permanent magnet 6 is adjacent to the second permanent magnet 7 with the inlet side ventilation path 11 interposed therebetween in the circumferential direction of the magnet holding member 4. The third permanent magnet 18 and the fourth permanent magnet 19 are provided at the boundary between the inlet side ventilation passage 11 and the outlet side ventilation passage 12. That is, the third permanent magnet 18 is adjacent to the fourth permanent magnet 19 with the ventilation passage 5 interposed therebetween at the boundary between the inlet side ventilation passage 11 and the exit side ventilation passage 12 in the circumferential direction of the magnet holding member 4.

第３永久磁石１８、第４永久磁石１９、第５永久磁石２０及び第６永久磁石２１によって、出側通風路１２が形成される。第５永久磁石２０は、出側通風路１２に沿って第３永久磁石１８に隣接する。出側通風路１２は入側通風路１１に対し傾斜しているため、第５永久磁石２０は、磁石保持部材４の円周方向において第３永久磁石１８からずれた位置に配置される。 The exit side ventilation path 12 is formed by the third permanent magnet 18, the fourth permanent magnet 19, the fifth permanent magnet 20, and the sixth permanent magnet 21. The fifth permanent magnet 20 is adjacent to the third permanent magnet 18 along the exit side ventilation path 12. Since the outlet side ventilation passage 12 is inclined with respect to the entrance side ventilation passage 11, the fifth permanent magnet 20 is arranged at a position deviated from the third permanent magnet 18 in the circumferential direction of the magnet holding member 4.

第６永久磁石２１は、出側通風路１２に沿って第４永久磁石１９に隣接する。第６永久磁石２１は、磁石保持部材４の円周方向において第４永久磁石１９からずれた位置に配置される。第６永久磁石２１は、磁石保持部材４の円周方向において出側通風路１２を挟んで第５永久磁石２０に隣接する。このような構成により、磁石保持部材４の軸方向において通風路５は屈曲する。この場合であっても、通風路５の一部又は全部が磁石保持部材４の軸方向に対し傾斜するため、導電部材８、第１永久磁石６〜第６永久磁石２１の過度の温度上昇が抑制される。 The sixth permanent magnet 21 is adjacent to the fourth permanent magnet 19 along the exit side ventilation path 12. The sixth permanent magnet 21 is arranged at a position deviated from the fourth permanent magnet 19 in the circumferential direction of the magnet holding member 4. The sixth permanent magnet 21 is adjacent to the fifth permanent magnet 20 with the exit side ventilation path 12 interposed therebetween in the circumferential direction of the magnet holding member 4. With such a configuration, the ventilation passage 5 bends in the axial direction of the magnet holding member 4. Even in this case, since a part or all of the ventilation passage 5 is inclined with respect to the axial direction of the magnet holding member 4, the temperature of the conductive member 8 and the first permanent magnets 6 to 6 is excessively increased. It is suppressed.

好ましくは、出側通風路１２の延びる方向は、入側通風路１１の延びる方向と交差し、かつ、入側通風路１１の磁石保持部材４の軸方向Ｃに対する傾斜角度と同じ角度、磁石保持部材４の軸方向Ｃに対し傾斜する。また、第３永久磁石１８及び第４永久磁石１９は、磁石保持部材４の軸方向Ｃにおいて、磁石保持部材４の中央に固定されるのが好ましい。第１永久磁石６は、磁石保持部材４の軸方向の中央に対し第５永久磁石２０と対称に設けられるのが好ましい。第２永久磁石７は、磁石保持部材４の軸方向の中央に対し第６永久磁石２１と対称に設けられるのが好ましい。この場合、磁石保持部材４の軸方向の中央に対し、入側通風路１１は出側通風路１２と対称となる。そのため、第１永久磁石〜第６永久磁石が、均一に冷却されやすい。 Preferably, the extending direction of the exit side ventilation passage 12 intersects with the extending direction of the entrance side ventilation passage 11, and the magnet holding is at the same angle as the inclination angle of the magnet holding member 4 of the entrance side ventilation passage 11 with respect to the axial direction C. The member 4 is inclined with respect to the axial direction C. Further, the third permanent magnet 18 and the fourth permanent magnet 19 are preferably fixed to the center of the magnet holding member 4 in the axial direction C of the magnet holding member 4. The first permanent magnet 6 is preferably provided symmetrically with respect to the axial center of the magnet holding member 4 with respect to the fifth permanent magnet 20. The second permanent magnet 7 is preferably provided symmetrically with respect to the axial center of the magnet holding member 4 with respect to the sixth permanent magnet 21. In this case, the inlet side ventilation passage 11 is symmetrical with the outlet side ventilation passage 12 with respect to the center in the axial direction of the magnet holding member 4. Therefore, the first permanent magnets to the sixth permanent magnets are likely to be uniformly cooled.

また、第６永久磁石２１の磁極の配置は、第５永久磁石２０の磁極の配置と反転している。そのため、第５永久磁石２０、第６永久磁石２１、導電部材８及び磁石保持部材４の中においても、磁気回路が形成される。したがって、永久磁石のサイズが小さくても、渦電流式ダンパの減衰力は、第１実施形態と比べても劣らない。 Further, the arrangement of the magnetic poles of the sixth permanent magnet 21 is reversed from the arrangement of the magnetic poles of the fifth permanent magnet 20. Therefore, a magnetic circuit is also formed in the fifth permanent magnet 20, the sixth permanent magnet 21, the conductive member 8, and the magnet holding member 4. Therefore, even if the size of the permanent magnet is small, the damping force of the eddy current type damper is not inferior to that of the first embodiment.

上述の第１〜第３実施形態では、磁石保持部材が導電部材の内側に配置され、各永久磁石が磁石保持部材の外周面に固定される場合について説明した。しかしながら、本実施形態の渦電流式ダンパは、これに限定されない。 In the first to third embodiments described above, the case where the magnet holding member is arranged inside the conductive member and each permanent magnet is fixed to the outer peripheral surface of the magnet holding member has been described. However, the eddy current type damper of the present embodiment is not limited to this.

［第４実施形態］
第４実施形態の渦電流式ダンパは、第１〜第３実施形態の渦電流式ダンパと比べて、磁石保持部材及び導電部材の位置関係が異なる。第４実施形態の渦電流式ダンパでは、磁石保持部材が導電部材の外側に配置され、各永久磁石が磁石保持部材の内周面に固定される。第４実施形態の渦電流式ダンパにおいても、各永久磁石の配置は、第１実施形態〜第３実施形態の永久磁石の配置が採用できる。 [Fourth Embodiment]
The eddy current type damper of the fourth embodiment is different from the eddy current type damper of the first to third embodiments in the positional relationship between the magnet holding member and the conductive member. In the eddy current type damper of the fourth embodiment, the magnet holding member is arranged outside the conductive member, and each permanent magnet is fixed to the inner peripheral surface of the magnet holding member. Also in the eddy current type damper of the fourth embodiment, the arrangement of the permanent magnets of the first to third embodiments can be adopted as the arrangement of each permanent magnet.

図９は、第４実施形態の渦電流式ダンパの軸方向の断面図である。図９を参照して、磁石保持部材４は、導電部材８、ボールナット３及びねじ軸２を収容可能である。 FIG. 9 is a cross-sectional view of the eddy current type damper of the fourth embodiment in the axial direction. With reference to FIG. 9, the magnet holding member 4 can accommodate the conductive member 8, the ball nut 3, and the screw shaft 2.

図１０は、図９の一部拡大図である。図１０を参照して、第１永久磁石６は、磁石保持部材４の内周面に固定される。第２永久磁石〜第６永久磁石も同様である。したがって、導電部材８の外周面が、各永久磁石と隙間を空けて対向する。 FIG. 10 is a partially enlarged view of FIG. With reference to FIG. 10, the first permanent magnet 6 is fixed to the inner peripheral surface of the magnet holding member 4. The same applies to the second permanent magnet to the sixth permanent magnet. Therefore, the outer peripheral surface of the conductive member 8 faces each permanent magnet with a gap.

第４実施形態の渦電流式ダンパでは、磁石保持部材４が導電部材８の外側に配置される。つまり、磁石保持部材４が最も外側に配置されて外気と接する。また、磁石保持部材４は、ねじ軸２周りに回転する。これにより、回転する磁石保持部材４は外気によって効率良く冷却される。そのため、磁石保持部材４を通じて各永久磁石を冷却できる。その結果、各永久磁石の過度な温度上昇をさらに抑制できる。 In the eddy current type damper of the fourth embodiment, the magnet holding member 4 is arranged outside the conductive member 8. That is, the magnet holding member 4 is arranged on the outermost side and comes into contact with the outside air. Further, the magnet holding member 4 rotates around the screw shaft 2. As a result, the rotating magnet holding member 4 is efficiently cooled by the outside air. Therefore, each permanent magnet can be cooled through the magnet holding member 4. As a result, it is possible to further suppress an excessive temperature rise of each permanent magnet.

取付具１４は導電部材８に接続される。そのため、導電部材８はねじ軸２周りに回転しない。一方で、磁石保持部材４は、ボールナット３に固定される。したがって、ボールナット３が回転すれば、磁石保持部材４は回転する。したがって、磁石保持部材４が回転すれば通風路内の空気が流れ、導電部材及び各永久磁石の過度な温度上昇が抑制される。また、磁石保持部材４に固定された各永久磁石が導電部材８に対して相対回転するため、導電部材８には渦電流が発生する。その結果、渦電流式ダンパ１に減衰力が生じ、振動を減衰させることができる。 The fixture 14 is connected to the conductive member 8. Therefore, the conductive member 8 does not rotate around the screw shaft 2. On the other hand, the magnet holding member 4 is fixed to the ball nut 3. Therefore, if the ball nut 3 rotates, the magnet holding member 4 rotates. Therefore, when the magnet holding member 4 rotates, the air in the ventilation passage flows, and the excessive temperature rise of the conductive member and each permanent magnet is suppressed. Further, since each permanent magnet fixed to the magnet holding member 4 rotates relative to the conductive member 8, an eddy current is generated in the conductive member 8. As a result, a damping force is generated in the eddy current type damper 1, and the vibration can be damped.

［フィン］
導電部材及び各永久磁石の冷却効果をさらに高めるため、渦電流式ダンパはフィンを含んでもよい。以下では、例として、第１実施形態の渦電流式ダンパにフィンが設けられる場合について説明する。しかしながら、第２〜第４実施形態の渦電流式ダンパも、以下の説明と同様のフィンを含むことができる。 [fin]
The eddy current damper may include fins in order to further enhance the cooling effect of the conductive member and each permanent magnet. Hereinafter, as an example, a case where fins are provided in the eddy current type damper of the first embodiment will be described. However, the eddy current type dampers of the second to fourth embodiments can also include fins similar to those described below.

図１１は、フィンを含む渦電流式ダンパの断面図である。図１１を参照して、フィン１３は、磁石保持部材４の外周面に固定される。磁石保持部材４が回転すると、フィン１３も磁石保持部材４の中心軸周りに回転する。フィン１３の回転により、渦電流式ダンパ内の空気が流れ、導電部材８及び各永久磁石の熱が拡散される。したがって、導電部材及び各永久磁石の過度な温度上昇がさらに抑制される。 FIG. 11 is a cross-sectional view of an eddy current type damper including fins. With reference to FIG. 11, the fin 13 is fixed to the outer peripheral surface of the magnet holding member 4. When the magnet holding member 4 rotates, the fins 13 also rotate around the central axis of the magnet holding member 4. By the rotation of the fin 13, the air in the eddy current type damper flows, and the heat of the conductive member 8 and each permanent magnet is diffused. Therefore, the excessive temperature rise of the conductive member and each permanent magnet is further suppressed.

図１２は、フィンの他の実施形態を示す断面図である。図１２を参照して、フィン１３は、導電部材８の内周面に固定される。導電部材８は、磁石保持部材４の軸回りに回転しない。この場合、フィン１３は渦電流式ダンパ内の熱を吸収する。したがって、導電部材及び各永久磁石の過度な温度上昇がさらに抑制される。 FIG. 12 is a cross-sectional view showing another embodiment of the fin. With reference to FIG. 12, the fin 13 is fixed to the inner peripheral surface of the conductive member 8. The conductive member 8 does not rotate about the axis of the magnet holding member 4. In this case, the fin 13 absorbs the heat in the eddy current damper. Therefore, the excessive temperature rise of the conductive member and each permanent magnet is further suppressed.

図１３は、フィンの他の実施形態を示す断面図である。図１３を参照して、フィン１３は導電部材８の外周面に固定される。この場合、フィン１３は導電部材８の熱を外部に放出する。これにより、導電部材８の温度が低下し、導電部材８が各永久磁石の熱を吸収できるようになる。したがって、導電部材及び各永久磁石の過度な温度上昇がさらに抑制される。 FIG. 13 is a cross-sectional view showing another embodiment of the fin. With reference to FIG. 13, the fin 13 is fixed to the outer peripheral surface of the conductive member 8. In this case, the fin 13 releases the heat of the conductive member 8 to the outside. As a result, the temperature of the conductive member 8 is lowered, and the conductive member 8 can absorb the heat of each permanent magnet. Therefore, the excessive temperature rise of the conductive member and each permanent magnet is further suppressed.

フィン１３の数は特に限定されない。たとえば、フィン１３は、磁石保持部材４の円周方向に複数配置されてもよい。また、図１１〜図１３に示すフィンを組み合せて用いてもよい。 The number of fins 13 is not particularly limited. For example, a plurality of fins 13 may be arranged in the circumferential direction of the magnet holding member 4. Further, the fins shown in FIGS. 11 to 13 may be used in combination.

以上、本実施形態の渦電流式ダンパについて説明した。その他、本発明は上記の実施形態に限定されず、本発明の趣旨を逸脱しない範囲で、種々の変更が可能であることは言うまでもない。 The eddy current type damper of the present embodiment has been described above. In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

本発明の渦電流式ダンパは、建造物の制震装置および免震装置に有用である。 The eddy current type damper of the present invention is useful for a seismic control device and a seismic isolation device for a building.

１：渦電流式ダンパ
２：ねじ軸
３：ボールナット
４：磁石保持部材
５：通風路
６：第１永久磁石
７：第２永久磁石
８：導電部材
９：第１側面
１０：第２側面
１１：入側通風路
１２：出側通風路
１３：フィン
１４：取付具（導電部材と一体）
１５：取付具（ねじ軸と一体）
１６：ラジアル軸受
１７：スラスト軸受
１８：第３永久磁石
１９：第４永久磁石
２０：第５永久磁石
２１：第６永久磁石 1: Eddy current type damper 2: Screw shaft 3: Ball nut 4: Magnet holding member 5: Ventilation path 6: First permanent magnet 7: Second permanent magnet 8: Conductive member 9: First side surface 10: Second side surface 11 : Entering air passage 12: Outing side air passage 13: Fin 14: Fixture (integrated with conductive member)
15: Fixture (integrated with screw shaft)
16: Radial bearing 17: Thrust bearing 18: 3rd permanent magnet 19: 4th permanent magnet 20: 5th permanent magnet 21: 6th permanent magnet

Claims

ねじ軸と、
前記ねじ軸とかみ合うボールナットと、
前記ボールナットに固定された円筒形状の磁石保持部材と、
前記磁石保持部材に設けられ、前記磁石保持部材の軸方向に対し傾斜した通風路と、
前記磁石保持部材の円周方向において前記通風路に隣接し、前記磁石保持部材に固定された第１永久磁石と、
前記磁石保持部材の円周方向において前記通風路を挟んで前記第１永久磁石に隣接し、前記磁石保持部材に固定され、前記第１永久磁石と磁極の配置が反転した第２永久磁石と、
導電性を有し、前記第１永久磁石及び前記第２永久磁石と隙間を空けて対向する円筒形状の導電部材と、を備える、渦電流式ダンパ。 Screw shaft and
A ball nut that meshes with the screw shaft,
A cylindrical magnet holding member fixed to the ball nut and
A ventilation path provided in the magnet holding member and inclined with respect to the axial direction of the magnet holding member, and
A first permanent magnet adjacent to the ventilation path in the circumferential direction of the magnet holding member and fixed to the magnet holding member.
A second permanent magnet adjacent to the first permanent magnet across the ventilation path in the circumferential direction of the magnet holding member, fixed to the magnet holding member, and the arrangement of the first permanent magnet and the magnetic poles reversed.
An eddy current damper having conductivity and comprising a cylindrical conductive member that faces the first permanent magnet and the second permanent magnet with a gap.

請求項１に記載の渦電流式ダンパであって、
前記第１永久磁石は、前記通風路に沿って前記磁石保持部材の軸方向に対し傾斜した第１側面を含み、
前記第２永久磁石は、前記通風路に沿って前記磁石保持部材の軸方向に対し傾斜した第２側面を含む、渦電流式ダンパ。 The eddy current type damper according to claim 1.
The first permanent magnet includes a first side surface that is inclined with respect to the axial direction of the magnet holding member along the ventilation path.
The second permanent magnet is an eddy current type damper including a second side surface inclined with respect to the axial direction of the magnet holding member along the ventilation path.

請求項１に記載の渦電流式ダンパであってさらに、
前記通風路に沿って前記第１永久磁石に隣接し、前記磁石保持部材に固定された第３永久磁石と、
前記通風路に沿って前記第２永久磁石に隣接し、前記磁石保持部材の円周方向において前記通風路を挟んで前記第３永久磁石に隣接し、前記磁石保持部材に固定され、前記第３永久磁石と磁極の配置が反転した第４永久磁石と、を備える、渦電流式ダンパ。 The eddy current type damper according to claim 1, further
A third permanent magnet adjacent to the first permanent magnet along the ventilation path and fixed to the magnet holding member, and a third permanent magnet.
Adjacent to the second permanent magnet along the ventilation path, adjacent to the third permanent magnet with the ventilation path sandwiched in the circumferential direction of the magnet holding member, and fixed to the magnet holding member, the third. An eddy current type damper including a permanent magnet and a fourth permanent magnet in which the arrangement of magnetic poles is reversed.

請求項３に記載の渦電流式ダンパであって、
前記通風路は、前記磁石保持部材の軸方向に対し傾斜した入側通風路と、前記入側通風路の延びる方向に対し傾斜した出側通風路と、を含み、
前記第１永久磁石は、前記磁石保持部材の円周方向において前記入側通風路を挟んで前記第２永久磁石と隣接し、
前記第３永久磁石は、前記磁石保持部材の円周方向において前記入側通風路と前記出側通風路との境界で前記通風路を挟んで前記第４永久磁石と隣接し、
前記渦電流式ダンパはさらに、
前記出側通風路に沿って前記第３永久磁石に隣接し、前記磁石保持部材に固定された第５永久磁石と、
前記出側通風路に沿って前記第４永久磁石に隣接し、前記磁石保持部材の円周方向において前記出側通風路を挟んで前記第５永久磁石に隣接し、前記磁石保持部材に固定され、前記第５永久磁石と磁極の配置が反転した第６永久磁石と、を備える、渦電流式ダンパ。 The eddy current type damper according to claim 3.
The ventilation passage includes an inlet side ventilation passage inclined with respect to the axial direction of the magnet holding member and an outlet side ventilation passage inclined with respect to the extending direction of the inlet side ventilation passage.
The first permanent magnet is adjacent to the second permanent magnet in the circumferential direction of the magnet holding member with the inlet side ventilation path interposed therebetween.
The third permanent magnet is adjacent to the fourth permanent magnet with the ventilation path sandwiched at the boundary between the inlet side ventilation path and the exit side ventilation path in the circumferential direction of the magnet holding member.
The eddy current damper further
A fifth permanent magnet adjacent to the third permanent magnet along the exit side ventilation path and fixed to the magnet holding member, and a fifth permanent magnet.
Adjacent to the 4th permanent magnet along the exit side ventilation path, adjacent to the 5th permanent magnet with the exit side ventilation path sandwiched in the circumferential direction of the magnet holding member, and fixed to the magnet holding member. An eddy current type damper comprising the fifth permanent magnet and a sixth permanent magnet in which the arrangement of magnetic poles is reversed.

請求項１〜請求項４のいずれか１項に記載の渦電流式ダンパであってさらに、
前記磁石保持部材に固定されたフィンを備える、渦電流式ダンパ。 The eddy current type damper according to any one of claims 1 to 4.
An eddy current damper having fins fixed to the magnet holding member.

請求項１〜請求項５のいずれか１項に記載の渦電流式ダンパであってさらに、
前記導電部材に固定されたフィンを備える、渦電流式ダンパ。
The eddy current type damper according to any one of claims 1 to 5, further
An eddy current damper having fins fixed to the conductive member.