JP2000358357A - Eddy current decelerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute sidewalls of a guide cylinder from stainless steel plate, which is a ferromagnetic material and form a nonmagnetic parts which do not face magnets through thermal treatment. SOLUTION: An immovable guide cylinder 5, which has a hollow part with approximately a rectangular cross-section, is provided between a pair of left and right braking discs 3 coupled with a rotary shaft 2. At least one magnet support ring 8 which supports a number of magnets 12 in its circumferential direction with the same intervals is rotatably supported in the hollow part of the guide cylinder 5. Both the sidewalls of the guide cylinder 5 are made from stainless steel plates. The magnetic parts 6 of both the sidewalls which face the magnets 12 are used as they are, and the nonmagnetic parts of both the sidewalls which do not face the magnets are heated to a temperature of not lower than 800 deg.C and then quick chilled to produce a nonmagnetic or weakly magnetic austenite phase.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は例えば車両の摩擦ブ
レーキを補助する渦電流減速装置、特に構成が簡単で製
造が容易な強磁性板と一体の案内筒を備えた渦電流減速
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current reduction device for assisting, for example, a friction brake of a vehicle, and more particularly to an eddy current reduction device having a simple structure and a ferromagnetic plate and a guide tube integrated with one another which is easy to manufacture. is there.

【０００２】[0002]

【従来の技術】特公平６−１０１９２２号公報に開示さ
れるような、回転軸に結合した１対の制動円板の間に永
久磁石（以下単にこれを磁石という）を有する磁石支持
輪を備えた渦電流減速装置では、非制動時に磁石からの
磁界が外部へ洩れないように、磁石を覆う強磁性板（ポ
ールピース）をかなり厚く（一般的には１０〜１６ｍ
ｍ）しなければならい。このため、アルミニウム鋳物か
らなる案内筒に強磁性板を鋳込んだり、非磁性のステン
レス鋼板を円筒状に金型プレスにより成形したうえ周方
向等間隔に多数の開口を設け、該開口に強磁性板を嵌合
し溶接していた。前者の方法はアルミニウム鋳物へ強磁
性板の鋳込み不良率が高く、後者の方法は強磁性板の溶
接に手数が掛るので加工経費の削減が難しい。2. Description of the Related Art As disclosed in Japanese Patent Publication No. 6-101922, a vortex provided with a magnet support wheel having a permanent magnet (hereinafter simply referred to as a magnet) between a pair of braking disks connected to a rotating shaft. In the current reduction device, the ferromagnetic plate (pole piece) covering the magnet is considerably thick (generally 10 to 16 m) so that the magnetic field from the magnet does not leak to the outside during non-braking.
m) must do. For this purpose, a ferromagnetic plate is cast into a guide cylinder made of an aluminum casting, or a nonmagnetic stainless steel plate is formed into a cylindrical shape by a metal mold press, and a large number of openings are provided at equal intervals in the circumferential direction. The plates were fitted and welded. The former method has a high defective rate of casting a ferromagnetic plate into an aluminum casting, and the latter method requires a lot of trouble to weld the ferromagnetic plate, so that it is difficult to reduce the processing cost.

【０００３】[0003]

【発明が解決しようとする課題】本発明の課題は上述の
問題に鑑み、案内筒の両側壁を強磁性体である厚肉のス
テンレス鋼板から構成し、該ステンレス鋼板の強磁性板
に相当する部分を残し、他の部分を熱処理して非磁性体
または弱磁性体にした、製造が簡単で安価な渦電流減速
装置を提供することにある。SUMMARY OF THE INVENTION In view of the above-mentioned problems, the object of the present invention is to form both side walls of a guide cylinder from a thick stainless steel plate which is a ferromagnetic material, which corresponds to a ferromagnetic plate of the stainless steel plate. An object of the present invention is to provide an inexpensive eddy current reduction device in which a part is left and the other part is heat-treated to be a non-magnetic material or a weak magnetic material, and is easy to manufacture and inexpensive.

【０００４】[0004]

【課題を解決するための手段】上記課題を解決するため
に、本発明の構成は回転軸に結合した１対の制動円板
と、該制動円板の間の非回転部分に配設されかつ断面長
方形の内空部を有する非磁性体からなる案内筒と、該案
内筒の内空部に回動可能に支持した少くとも１つの磁石
支持輪と、該磁石支持輪に周方向等間隔に支持した多数
の磁石と、前記案内筒の両側壁の前記各磁石と対向する
部分に配設した強磁性板とを有し、前記磁石からの磁界
により渦電流に基づく制動力を前記制動円板に発生させ
る渦電流減速装置において、前記案内筒の両側壁を強磁
性体であるステンレス鋼板から構成し、両側壁の前記磁
石と対向する部分により前記強磁性板を形成し、両側壁
の前記磁石と対向しない部分を、温度８００℃以上に加
熱した後に急冷して非磁性または弱磁性のオーステナイ
ト相にしたことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an embodiment of the present invention comprises a pair of braking disks connected to a rotating shaft, and a rectangular cross-section disposed on a non-rotating portion between the braking disks. A guide tube made of a non-magnetic material having an inner space portion, at least one magnet support wheel rotatably supported by the inner space portion of the guide tube, and supported at equal circumferential intervals by the magnet support wheel. It has a large number of magnets and ferromagnetic plates disposed on portions of both side walls of the guide cylinder facing the respective magnets, and generates a braking force based on an eddy current on the braking disk by a magnetic field from the magnets. In the eddy current reduction device, both side walls of the guide cylinder are made of a stainless steel plate, which is a ferromagnetic material, and the ferromagnetic plate is formed by portions of both side walls facing the magnet, and the magnets on both side walls face each other. The part that does not need to be quenched after heating to a temperature of 800 ° C or higher Characterized in that the austenite phase of the magnetic or weakly magnetic.

【０００５】[0005]

【発明の実施の形態】本発明では磁石の側面を覆う案内
筒の両側壁を強磁性体である厚肉のマルテンサイト系ス
テンレス鋼板またはフエライト系ステンレス鋼板から構
成し、両側壁の磁石と対向する部分をそのまま厚肉の磁
性部分とし、両側壁の磁石と対向しない部分を温度８０
０℃以上に加熱した後に急冷して非磁性または弱磁性の
オーステナイト相にする。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, both side walls of a guide cylinder that covers the side surfaces of a magnet are made of a ferromagnetic thick martensitic stainless steel plate or ferrite stainless steel plate, and are opposed to the magnets on both side walls. The part is used as it is as a thick magnetic part, and the part which is not opposed to the magnet on both side walls has a temperature of 80
After heating to 0 ° C. or higher, it is rapidly cooled to a nonmagnetic or weakly magnetic austenitic phase.

【０００６】両側壁の磁石と対向しない部分の内面と外
面の少くとも一方に軸方向の溝を設けて薄肉の非磁性部
分を形成する。薄肉部分を溝加工により形成する代り
に、鋳造または鍛造により、両側壁に厚肉部分と薄肉部
分を一体に形成してもよい。An axial groove is provided on at least one of the inner surface and the outer surface of a portion of the both side walls which do not face the magnet to form a thin non-magnetic portion. Instead of forming the thin portion by groove processing, the thick portion and the thin portion may be integrally formed on both side walls by casting or forging.

【０００７】[0007]

【実施例】図１は本発明による渦電流減速装置の正面断
面図、図２は同側面図、図３は同平面展開断面図であ
る。本発明による渦電流減速装置は例えば車両用変速機
の出力回転軸２に結合される１対の導体からなる制動円
板３と、制動円板３の間に配設される案内筒５と、案内
筒５の断面長方形の内空部に相対回動可能に支持した非
磁性体からなる内外１対の磁石支持輪８，１０とを備え
ている。制動円板３はボス３ａを回転軸２にスプライン
嵌合して固定され、ボス３ａから放射状に延びる複数の
スポーク３ｂと、放射状に延びる複数の通風路３ｃを有
する制動円板３が、例えば鋳造により一体に形成され
る。制動円板３の外周縁部と内周縁部の強磁性板（ポー
ルピース）６と対向しない部分に、銅などの良伝導体か
らなる環状体２３，２４が結合される。各環状体２３，
２４は制動円板３の内部を流れる渦電流に径方向の広が
りをもたせ、制動トルクを増大させる。1 is a front sectional view of an eddy current reduction device according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a developed sectional view thereof. The eddy current reduction device according to the present invention includes, for example, a braking disk 3 composed of a pair of conductors coupled to an output rotation shaft 2 of a vehicle transmission, and a guide cylinder 5 disposed between the braking disks 3. The guide cylinder 5 includes a pair of inner and outer magnet support wheels 8 and 10 made of a non-magnetic material and supported in a rotatable manner in an inner space having a rectangular cross section of the guide cylinder 5. The braking disk 3 is fixed by spline-fitting the boss 3a to the rotating shaft 2 and has a plurality of spokes 3b extending radially from the boss 3a and a plurality of ventilation passages 3c extending radially. Are formed integrally. Rings 23 and 24 made of a good conductor such as copper are joined to portions of the braking disk 3 that are not opposed to the ferromagnetic plate (pole piece) 6 at the outer peripheral edge and the inner peripheral edge. Each ring 23,
Numeral 24 gives the eddy current flowing inside the braking disk 3 a radial expansion so as to increase the braking torque.

【０００８】案内筒５は左右１対の環状板からなる側壁
に非磁性体からなる外筒２１と内筒２２とを結合して構
成される。内筒２２はボス５ａから放射方向に延びる複
数のスポーク５ｂと一体に形成され、ボス５ａが軸受４
により回転軸２に支持される。案内筒５は適当な手段に
より例えば変速機の歯車箱に固定される。案内筒５の両
側壁に強磁性板（ポールピース）としての多数の厚肉の
磁性部分６が周方向等間隔に形成される。多数の磁石１
２を結合する内側の磁石支持輪８は、案内筒５の内部に
軸受７により回動可能に支持される。多数の磁石１３を
結合する外側の磁石支持輪１０は、内側の磁石支持輪８
の外周壁に軸受９により回動可能に支持される。磁石支
持輪８，１０の両側面に潤滑油を含浸させた薄い滑り板
１４が支持される。The guide cylinder 5 is constructed by connecting an outer cylinder 21 and an inner cylinder 22 made of a non-magnetic material to side walls made of a pair of left and right annular plates. The inner cylinder 22 is formed integrally with a plurality of spokes 5b extending radially from the boss 5a.
Is supported by the rotating shaft 2. The guide tube 5 is fixed by a suitable means, for example, to a gearbox of a transmission. A large number of thick magnetic portions 6 as ferromagnetic plates (pole pieces) are formed on both side walls of the guide cylinder 5 at regular intervals in the circumferential direction. Many magnets 1
The inner magnet support wheel 8 connecting the two 2 is rotatably supported by a bearing 7 inside the guide cylinder 5. The outer magnet support wheel 10 that connects the multiple magnets 13 is connected to the inner magnet support wheel 8.
Is rotatably supported by a bearing 9 on the outer peripheral wall of the first member. A thin sliding plate 14 impregnated with lubricating oil is supported on both side surfaces of the magnet support wheels 8 and 10.

【０００９】図２に示すように、内側の磁石支持輪８は
アルミニウムなどの非磁性体からなり、多数の扇形をな
す磁石１２が厚肉の磁性部分６と対向しかつ厚肉の磁性
部分６に対する極性が周方向に交互に異なるように配設
される。好ましくは、磁石１２は磁石支持輪８に鋳込ま
れる。外側の磁石支持輪１０も同様に多数の磁石１３が
厚肉の磁性部分６と対向して配設される。磁石支持輪１
０の外周壁に形成した部分歯車１８に、案内筒５に固定
した電動機１６のピニオン１５が噛み合され、磁石支持
輪１０は磁石１３の配列ピツチｐだけ正逆回動可能とさ
れる。しかし、磁石支持輪１０の代りに、磁石支持輪８
を磁石１２の配列ピツチｐだけ正逆回動可能に構成して
もよい。厚肉の磁性部分６は内外１対の磁石１２，１３
の側面を覆う面積の扇形のものである。As shown in FIG. 2, the inner magnet support wheel 8 is made of a non-magnetic material such as aluminum, and a large number of sector-shaped magnets 12 oppose the thick magnetic portion 6 and the thick magnetic portion 6. Are alternately arranged in the circumferential direction. Preferably, the magnet 12 is cast into the magnet support wheel 8. Similarly, a large number of magnets 13 are arranged on the outer magnet support wheel 10 so as to face the thick magnetic portion 6. Magnet support wheel 1
The pinion 15 of the electric motor 16 fixed to the guide cylinder 5 is meshed with a partial gear 18 formed on the outer peripheral wall of the zero, and the magnet support wheel 10 can be rotated forward and backward by the arrangement pitch p of the magnet 13. However, instead of the magnet support wheel 10, the magnet support wheel 8
May be configured to be rotatable forward and backward by the arrangement pitch p of the magnets 12. The thick magnetic portion 6 includes a pair of inner and outer magnets 12 and 13.
It has a fan shape with an area that covers the side surface.

【００１０】図３に示すように、本発明では案内筒５の
両側壁を１３クロム（Cr）系ステンレス鋼などの強磁性
体である厚肉のマルテンサイト系ステンレス鋼板または
フエライト系ステンレス鋼板から構成し、両側壁の内面
に磁石１２，１３と対向する厚肉の磁性部分６を残し、
磁石１２，１３と対向しない部分は薄肉の非磁性または
弱磁性部分６ａとする。具体的には、薄肉の磁性部分６
ａを温度８００℃以上に加熱した後に急冷して非磁性ま
たは弱磁性のオーステナイト相にする。As shown in FIG. 3, in the present invention, both side walls of the guide tube 5 are made of a thick martensitic stainless steel plate or ferrite stainless steel plate which is a ferromagnetic material such as 13 chromium (Cr) stainless steel. Then, a thick magnetic portion 6 facing the magnets 12 and 13 is left on the inner surfaces of both side walls,
The portion not facing the magnets 12 and 13 is a thin nonmagnetic or weak magnetic portion 6a. Specifically, the thin magnetic portion 6
After a is heated to 800 ° C. or higher, it is rapidly cooled to a nonmagnetic or weakly magnetic austenitic phase.

【００１１】次に、本発明による渦電流減速装置の作動
について説明する。１対の制動円板３が回転軸２と一緒
に回転されるのに対し、図１に示すように、非制動時、
内外の磁石１２，１３の厚肉の磁性部分６に対する極性
が異なる配列では、左右２対の厚肉の磁性部分６の間で
短絡的磁気回路ｚが生じ、制動円板３に磁界を及ぼさな
い。強磁性板としての１対の厚肉の磁性部分６は磁石１
２，１３を両側から全面的に挟む状態にあるから、制動
円板３への洩れ磁束は殆ど生じず、制動円板３は引きず
りトルクを受けない。Next, the operation of the eddy current reduction device according to the present invention will be described. While a pair of braking disks 3 are rotated together with the rotating shaft 2, as shown in FIG.
In the arrangement in which the inner and outer magnets 12 and 13 have different polarities with respect to the thick magnetic portion 6, a short-circuit magnetic circuit z is generated between the two pairs of left and right thick magnetic portions 6, and no magnetic field is applied to the braking disk 3. . A pair of thick magnetic portions 6 as a ferromagnetic plate
Since the magnetic disks 2 and 13 are entirely sandwiched from both sides, almost no magnetic flux leaks to the braking disk 3, and the braking disk 3 does not receive drag torque.

【００１２】制動時、電動機１６により外側の磁石支持
輪１０を磁石１３の配列ピツチｐだけ回動すると、図２
に示すように、内外の磁石１２，１３の厚肉の磁性部分
６に対する極性が同じになる。したがつて、図３に示す
ように、内外の磁石１２と磁石１３が等しく厚肉の磁性
部分６を経て制動円板３に磁界を及ぼす。回転する制動
円板３が磁界を横切る時、制動円板３に渦電流が発生
し、制動円板３が制動トルクを受ける。この時、各磁石
１２から厚肉の磁性部分６、制動円板３、隣りの厚肉の
磁性部分６、隣りの磁石１２、反対側の厚肉の磁性部分
６、反対側の制動円板３、隣りの厚肉の磁性部分６へと
磁気回路ｗが生じる。磁石１３も左右１対の制動円板３
の間に同様の磁気回路を発生する。At the time of braking, when the outer magnet support wheel 10 is rotated by the motor 16 by the arrangement pitch p of the magnet 13, FIG.
As shown in (1), the polarities of the inner and outer magnets 12, 13 with respect to the thick magnetic portion 6 become the same. Therefore, as shown in FIG. 3, the inner and outer magnets 12 and 13 apply a magnetic field to the braking disk 3 via the equally thick magnetic portion 6. When the rotating brake disc 3 crosses the magnetic field, an eddy current is generated in the brake disc 3 and the brake disc 3 receives a braking torque. At this time, from each magnet 12, the thick magnetic part 6, the braking disk 3, the adjacent thick magnetic part 6, the adjacent magnet 12, the opposite thick magnetic part 6, and the opposite braking disk 3 Then, a magnetic circuit w is generated in the adjacent thick magnetic portion 6. The magnet 13 is also a pair of left and right braking discs 3.
A similar magnetic circuit is generated during.

【００１３】上述のように、案内筒５の両側壁の厚肉の
磁性部分６は、内外の磁石支持輪８，１０の磁石１２，
１３の配列ピツチｐの回転差動により、回転軸２を含む
面で短絡的磁気回路ｚを形成する非制動状態と、案内筒
５の側壁から制動円板３に磁界を及ぼす磁気回路ｗを形
成する制動状態とに切り換える。As described above, the thick magnetic portions 6 on both side walls of the guide cylinder 5 are connected to the magnets 12 of the inner and outer magnet support wheels 8, 10.
The non-braking state in which a short-circuit magnetic circuit z is formed on the plane including the rotating shaft 2 and the magnetic circuit w which applies a magnetic field to the braking disk 3 from the side wall of the guide cylinder 5 are formed by the rotational differential of the 13 arrangement pitches p. Switch to the braking state.

【００１４】図４〜６に示すように、案内筒５の側壁の
厚肉の磁性部分６の径方向中央部の肉厚を、内外周縁部
よりも厚くすれば、径方向中央部の磁束密度が他に比べ
て密になるので、非制動時により効率的な短絡的磁気回
路ｚが形成され、制動円板３へ及ぶ洩れ磁束を一層効率
的に減じることができる。図４に示す変更実施例では、
厚肉の磁性部分６の径方向中央部の肉厚を厚くし、その
分だけ磁石１２，１３の互いに接する部分（軸受９に隣
接する部分）で薄くなるようにしたものである。図５に
示す変更実施例では、厚肉の磁性部分６を径方向中央部
の肉厚が厚く、内外周縁部の肉厚が薄くなるように階段
状にしたものであり、厚肉の磁性部分６の内面に対応し
て磁石１２，１３は断面Ｔ字形とされる。図６に示す変
更実施例では、厚肉の磁性部分６の内面が円弧状に突出
される。図７に示す変更実施例では、逆に厚肉の磁性部
分６の外面が山形に突出され、厚肉の磁性部分６の外面
に対応して、制動円板３にはＶ形の環状溝１９が形成さ
れる。As shown in FIGS. 4 to 6, if the thickness of the thick magnetic portion 6 on the side wall of the guide cylinder 5 is made thicker at the radial center than at the inner and outer peripheral edges, the magnetic flux density at the radial center is obtained. Are more dense than the others, a more efficient short-circuit magnetic circuit z is formed when braking is not performed, and the leakage magnetic flux reaching the braking disk 3 can be reduced more efficiently. In the modified embodiment shown in FIG.
The thickness of the thick magnetic portion 6 at the center in the radial direction is increased, and the thickness of the magnets 12 and 13 at the portion in contact with each other (the portion adjacent to the bearing 9) is reduced accordingly. In the modified embodiment shown in FIG. 5, the thick magnetic portion 6 is stepped so that the thickness at the center in the radial direction is large and the thickness at the inner and outer peripheral edges is small. The magnets 12 and 13 have a T-shaped cross section corresponding to the inner surface of the magnet 6. In the modified embodiment shown in FIG. 6, the inner surface of the thick magnetic portion 6 is projected in an arc shape. In the modified embodiment shown in FIG. 7, the outer surface of the thick magnetic portion 6 protrudes in a mountain shape, and the V-shaped annular groove 19 is formed in the braking disk 3 corresponding to the outer surface of the thick magnetic portion 6. Is formed.

【００１５】図８〜１０に示すように、案内筒５の強磁
性体である厚肉のマルテンサイト系ステンレス鋼板また
はフエライト系ステンレス鋼板からなる側壁は、厚肉の
磁性部分６が内外両面に突出し、薄肉の非磁性または弱
磁性部分６ａが中間位置に存するように構成してもよ
い。また、制動時磁石１２，１３と１対の厚肉の磁性部
分６との間に生じる磁気回路ｗ（図３を参照）は、制動
円板３の回転数が高くなるほど、制動円板３の矢印ｘで
示す回転方向へ引きずられた格好に歪むので、厚肉の磁
性部分６の平面断面の形状は図８に示す長方形にするよ
りも、図９，１０に示すような形状が好ましい。図９に
示す実施例では、厚肉の磁性部分６の前端面（制動円板
３の回転方向前方の端面）の外面側を切除して傾斜面２
６ａを形成し、同様に厚肉の磁性部分６の後端面の外面
側を切除して傾斜面２６ｂを形成することにより、磁石
１２，１３からの磁束を絞つて（磁束密度を高めて）制
動円板３へ導き、制動トルクを高めることができる。図
１０に示す実施例では、厚肉の磁性部分６の後端面の外
面側を制動円板３の矢印ｘで示す回転方向へ一層傾けて
傾斜面２６ｂを形成することにより、制動円板３の高速
回転での磁石１２，１３からの磁束を厚肉の磁性部分６
の前端部へ絞り込むことができる。As shown in FIGS. 8 to 10, the side wall made of a thick martensitic stainless steel plate or a ferrite stainless steel plate which is a ferromagnetic material of the guide cylinder 5 has a thick magnetic portion 6 protruding on both the inner and outer surfaces. Alternatively, the structure may be such that the thin nonmagnetic or weak magnetic portion 6a is located at an intermediate position. Further, the magnetic circuit w (see FIG. 3) generated between the braking magnets 12 and 13 and the pair of thick magnetic portions 6 indicates that the higher the rotation speed of the braking disk 3 is, the more the braking circuit 3 is rotated. Since it is distorted in the rotational direction indicated by the arrow x, the thick magnetic portion 6 preferably has a plan sectional shape shown in FIGS. 9 and 10 rather than a rectangular shape shown in FIG. In the embodiment shown in FIG. 9, the outer surface side of the front end surface (the end surface in the rotation direction front of the braking disk 3) of the thick magnetic portion 6 is cut off to form the inclined surface 2.
6a, and similarly, by cutting off the outer surface of the rear end face of the thick magnetic portion 6 to form the inclined surface 26b, the magnetic flux from the magnets 12 and 13 is throttled (the magnetic flux density is increased) and braking is performed. By guiding to the disk 3, the braking torque can be increased. In the embodiment shown in FIG. 10, the outer surface side of the rear end face of the thick magnetic portion 6 is further inclined in the rotation direction indicated by the arrow x of the braking disk 3 to form the inclined surface 26b. The magnetic flux from the magnets 12 and 13 during high-speed rotation is transferred to the thick magnetic portion 6.
Can be narrowed down to the front end.

【００１６】図１１，１２に示す実施例では、案内筒５
の強磁性体である厚肉のマルテンサイト系ステンレス鋼
板またはフエライト系ステンレス鋼板からなる両側壁
に、多数の強磁性の厚肉の磁性部分６と薄肉の非磁性ま
たは弱磁性部分６ａとが周方向に交互に形成される。厚
肉の磁性部分６と同数の磁石１２，１２ａを支持する左
右１対の磁石支持輪８，８ａは、案内筒５の内空部に軸
受７，７ａにより回動可能に支持される。磁石支持輪
８，８ａの外側面に潤滑油を含浸した薄い滑り板１４が
結合され、厚肉の磁性部分６に摺接可能とされる。右側
の磁石支持輪８ａはアルミニウムなどの非磁性体からな
り、厚肉の磁性部分６と同数の扇形をなす磁石１２ａ
が、厚肉の磁性部分６と対向しかつ厚肉の磁性部分６に
対する極性が周方向に交互に異なるように配設される。
好ましくは、磁石１２ａは磁石支持輪８ａに鋳込まれ
る。左側の磁石支持輪８も同様に、厚肉の磁性部分６と
同数の扇形をなす磁石１２が、厚肉の磁性部分６と対向
しかつ厚肉の磁性部分６に対する極性が周方向に交互に
異なるように配設される。磁石支持輪８ａは図２に示し
たものと同様の手段により、磁石１２ａの配列ピツチだ
け正逆回動可能とされる。図示してないが、各厚肉の磁
性部分６は磁石１２，１２ａとほぼ同形のものである。
他の構成は図１の実施例と同様である。In the embodiment shown in FIGS.
A large number of ferromagnetic thick magnetic portions 6 and a thin non-magnetic or weak magnetic portion 6a are circumferentially provided on both side walls made of a thick martensitic stainless steel plate or a ferrite stainless steel plate which is a ferromagnetic material. Are formed alternately. A pair of left and right magnet support wheels 8, 8a supporting the same number of magnets 12, 12a as the thick magnetic portion 6 are rotatably supported by bearings 7, 7a in the inner space of the guide cylinder 5. A thin sliding plate 14 impregnated with lubricating oil is connected to the outer surfaces of the magnet support wheels 8 and 8a, so that the thin sliding plate 14 can be brought into sliding contact with the thick magnetic portion 6. The right magnet supporting wheel 8a is made of a non-magnetic material such as aluminum, and has the same number of fan-shaped magnets 12a as the thick magnetic portion 6.
However, they are arranged so as to face the thick magnetic portion 6 and to have the polarity of the thick magnetic portion 6 alternately different in the circumferential direction.
Preferably, the magnet 12a is cast into the magnet support wheel 8a. Similarly, the magnet support wheel 8 on the left side has the same number of sector-shaped magnets 12 as the thick magnetic portion 6, and the magnets 12 facing the thick magnetic portion 6 alternately have the polarity with respect to the thick magnetic portion 6 in the circumferential direction. Arranged differently. The magnet support wheel 8a can be rotated forward and backward by the arrangement pitch of the magnets 12a by means similar to that shown in FIG. Although not shown, each thick magnetic portion 6 has substantially the same shape as the magnets 12 and 12a.
Other configurations are the same as those of the embodiment of FIG.

【００１７】非制動時、左側の磁石支持輪８を固定し、
右側の磁石支持輪８ａを磁石１２ａの配列ピツチだけ回
動すると、相対向する磁石１２，１２ａの極性が同じに
なり、磁気回路が相殺されるので、制動円板３に磁界を
及ぼさない。制動時、１対の磁石支持輪８，８ａは相対
向する左右の磁石１２，１２ａの極性が逆になる位置に
保持される。したがつて、左右の磁石１２，１２ａが一
体的に厚肉の磁性部分６を経て制動円板３に垂直な磁界
を及ぼす。回転する制動円板３が磁界を横切る時、制動
円板３に渦電流が発生し、制動円板３が制動トルクを発
生する。この時、図１２に示すように、例えば、磁石１
２，１２ａから厚肉の磁性部分６、制動円板３、隣りの
厚肉の磁性部分６、隣りの磁石１２ａ，１２、反対側の
厚肉の磁性部分６、反対側の制動円板３、隣りの厚肉の
磁性部分６、元の磁石１２，１２ａへと磁気回路ｗが生
じる。At the time of non-braking, the left magnet support wheel 8 is fixed,
When the right magnet support wheel 8a is rotated by the pitch of the arrangement of the magnets 12a, the opposite magnets 12 and 12a have the same polarity, and the magnetic circuit is cancelled, so that no magnetic field is applied to the braking disk 3. At the time of braking, the pair of magnet support wheels 8, 8a is held at a position where the opposite left and right magnets 12, 12a have opposite polarities. Accordingly, the left and right magnets 12 and 12a integrally apply a magnetic field perpendicular to the braking disk 3 via the thick magnetic portion 6. When the rotating brake disc 3 crosses the magnetic field, an eddy current is generated in the brake disc 3 and the brake disc 3 generates a braking torque. At this time, as shown in FIG.
2, 12a to the thick magnetic portion 6, the braking disk 3, the adjacent thick magnetic portion 6, the adjacent magnets 12a and 12, the opposite thick magnetic portion 6, the opposite braking disk 3, A magnetic circuit w is formed between the adjacent thick magnetic portion 6 and the original magnets 12 and 12a.

【００１８】上述の実施例において、右側の磁石支持輪
８ａを固定し、左側の磁石支持輪８を電動機１６または
流体圧アクチユエータにより磁石１２の配列ピツチだけ
正逆回動するようにしてもよい。In the above-described embodiment, the right magnet support wheel 8a may be fixed, and the left magnet support wheel 8 may be rotated by the motor 16 or the fluid pressure actuator by the arrangement pitch of the magnets 12.

【００１９】図１３〜１５に示す実施例では、案内筒５
の強磁性体である厚肉のマルテンサイト系ステンレス鋼
板またはフエライト系ステンレス鋼板からなる両側壁
に、多数の厚肉の磁性部分６と薄肉の非磁性または弱磁
性部分６ａとが周方向交互に形成される。磁石支持輪８
は案内筒５の内空部に軸受７により回動可能に支持され
る。磁石支持輪８には多数の磁石１２が周方向等間隔に
結合される。磁石１２は各厚肉の磁性部分６に２つずつ
対向され、かつ厚肉の磁性部分６に対する極性が周方向
に２つずつ異なるように配設される。磁石支持輪８の両
側面に潤滑油を含浸させた薄い滑り板１４が結合され、
厚肉の磁性部分６に摺接可能とされる。図２に示したも
のと同様に、磁石支持輪８の外周壁に形成した部分歯車
に、案内筒５に固定した電動機のピニオンが噛み合さ
れ、磁石支持輪８は磁石１２の配列ピツチｐだけ正逆回
動可能とされる。他の構成は図１の実施例と同様であ
る。In the embodiment shown in FIGS.
A large number of thick magnetic portions 6 and thin non-magnetic or weak magnetic portions 6a are alternately formed in the circumferential direction on both side walls made of a thick martensitic stainless steel plate or a ferrite stainless steel plate which is a ferromagnetic material. Is done. Magnet support wheel 8
Is rotatably supported by a bearing 7 in the inner space of the guide cylinder 5. A large number of magnets 12 are connected to the magnet support wheel 8 at equal intervals in the circumferential direction. The magnets 12 are opposed to the thick magnetic portions 6 two by two, and are arranged such that the polarities with respect to the thick magnetic portions 6 differ by two in the circumferential direction. Thin sliding plates 14 impregnated with lubricating oil are connected to both side surfaces of the magnet support wheel 8,
Sliding contact with the thick magnetic portion 6 is enabled. 2, a pinion of an electric motor fixed to the guide cylinder 5 is meshed with a partial gear formed on the outer peripheral wall of the magnet support wheel 8, and the magnet support wheel 8 has only the arrangement pitch p of the magnets 12. Forward and reverse rotation is possible. Other configurations are the same as those of the embodiment of FIG.

【００２０】非制動時、共通の厚肉の磁性部分６に対す
る２つの磁石１２の極性が互いに異なる配列では、図１
４に示すように、左右１対の厚肉の磁性部分６の間で短
絡的磁気回路ｚが生じ、制動円板３に磁界を及ぼさな
い。制動時、磁石支持輪８を磁石１２の配列ピツチｐだ
け回動すると、共通の厚肉の磁性部分６に対向する２つ
の磁石１２の極性が同じになる。したがつて、図１５に
示すように、２つの磁石１２が等しく厚肉の磁性部分６
を経て制動円板３に磁界を及ぼす。回転する制動円板３
が磁界を横切る時、制動円板３に渦電流が発生し、制動
円板３が制動トルクを受ける。この時、磁石１２から厚
肉の磁性部分６、制動円板３、隣りの厚肉の磁性部分
６、隣りの磁石１２、反対側の厚肉の磁性部分６、反対
側の制動円板３、隣りの厚肉の磁性部分６、元の磁石１
２へと磁気回路ｗが生じる。In the non-braking mode, when the polarities of the two magnets 12 with respect to the common thick magnetic portion 6 are different from each other, FIG.
As shown in FIG. 4, a short-circuit magnetic circuit z is generated between the pair of left and right thick magnetic portions 6, and does not apply a magnetic field to the braking disk 3. When the magnet support wheel 8 is rotated by the arrangement pitch p of the magnets 12 during braking, the two magnets 12 facing the common thick magnetic portion 6 have the same polarity. Therefore, as shown in FIG. 15, the two magnets 12 are
, A magnetic field is applied to the braking disk 3. Rotating brake disk 3
When the traverses the magnetic field, an eddy current is generated in the braking disk 3, and the braking disk 3 receives a braking torque. At this time, from the magnet 12, the thick magnetic portion 6, the braking disk 3, the adjacent thick magnetic portion 6, the adjacent magnet 12, the opposite thick magnetic portion 6, the opposite braking disk 3, Next thick magnetic part 6, original magnet 1
2, a magnetic circuit w is generated.

【００２１】図１６に示す実施例は、図１３〜１５に示
す実施例において周方向に並ぶ２つの同極性の磁石１２
を１つにしたものである。案内筒５の強磁性体である厚
肉のマルテンサイト系ステンレス鋼板またはフエライト
系ステンレス鋼板からなる両側壁に、多数の厚肉の磁性
部分６と薄肉の非磁性または弱磁性部分６ａとが周方向
に交互に形成される。各厚肉の磁性部分６に対向して１
つの磁石１２が、厚肉の磁性部分６に対する極性が周方
向に交互に異なるように磁石支持輪８に結合される。磁
石支持輪８を磁石１２の半配列ピツチだけ回動すること
により、案内筒５の左右１対の厚肉の磁性部分６に周方
向に並ぶ２つの磁石１２が部分的に対向して短絡的磁気
回路ｚを形成する非制動位置と、案内筒５の左右１対の
厚肉の磁性部分６に１つの磁石１２が全面的に対向して
左右１対の制動円板３の間に磁気回路ｗを形成する制動
位置とに切り換わる。The embodiment shown in FIG. 16 is different from the embodiment shown in FIGS. 13 to 15 in that two magnets 12 of the same polarity are arranged in the circumferential direction.
Is one. A large number of thick magnetic portions 6 and a thin non-magnetic or weak magnetic portion 6a are circumferentially provided on both side walls made of a thick martensitic stainless steel plate or a ferrite stainless steel plate which is a ferromagnetic material of the guide cylinder 5. Are formed alternately. 1 facing each thick magnetic portion 6
Two magnets 12 are coupled to the magnet support wheel 8 such that the polarity for the thick magnetic portion 6 is alternately different in the circumferential direction. By rotating the magnet supporting wheel 8 by a half pitch of the magnets 12, the two magnets 12 arranged in the circumferential direction are partially opposed to the pair of left and right thick magnetic portions 6 of the guide cylinder 5 and short-circuited. One magnet 12 entirely opposes a pair of left and right thick magnetic portions 6 of the guide cylinder 5 and a non-braking position forming the magnetic circuit z, and a magnetic circuit is provided between the pair of left and right braking disks 3. It switches to the braking position forming w.

【００２２】図１７，１８に示す実施例では、案内筒５
の両側壁を肉厚が均一のマルテンサイト系ステンレス鋼
板またはフエライト系ステンレス鋼板から構成し、磁石
１２，１３と対向する部分６をそのまま残し、磁石１
２，１３と対向しない部分６ａを温度８００℃以上に加
熱した後に急冷することにより、非磁性または弱磁性の
オーステナイト相に構成したものである。案内筒５の両
側壁において、磁石１２，１３と対向する磁性とすべき
部分６と、磁石１２，１３と対向しない非磁性または弱
磁性とすべき部分６ａとを視認できるように、磁石１
２，１３と対向する部分６と磁石１２，１３と対向しな
い部分６ａの境目に、径方向に延びる溝３４または径方
向に並ぶ複数の刻印ないしくぼみを加工するのが好まし
い。In the embodiment shown in FIGS.
Are made of a martensitic stainless steel plate or a ferrite stainless steel plate having a uniform wall thickness, and the magnet 6 is left as it is, while the portion 6 facing the magnets 12 and 13 is left as it is.
The portion 6a that does not face the portions 2 and 13 is heated to a temperature of 800 ° C. or higher and then rapidly cooled to form a nonmagnetic or weakly magnetic austenitic phase. The magnet 1 is placed on both side walls of the guide cylinder 5 so that a magnetized portion 6 facing the magnets 12 and 13 and a nonmagnetic or weakly magnetized portion 6a not facing the magnets 12 and 13 can be visually recognized.
It is preferable to form a groove 34 extending in the radial direction or a plurality of indentations or grooves arranged in the radial direction at the boundary between the portion 6 opposed to the magnets 2 and 13 and the portion 6a not opposed to the magnets 12 and 13.

【００２３】回転軸２に結合した左右１対の制動円板３
の間に配設される不動の案内筒５は、外筒２１と内筒２
２の両端にマルテンサイト系ステンレス鋼板またはフエ
ライト系ステンレス鋼板を結合して断面長方形の内空部
を構成される。案内筒５の内空部には、可動の磁石支持
筒１３と不動の磁石支持筒１２とが収容される。A pair of left and right braking disks 3 coupled to the rotating shaft 2
Are fixed between the outer cylinder 21 and the inner cylinder 2.
A martensitic stainless steel plate or a ferrite stainless steel plate is connected to both ends of the steel sheet 2 to form an inner space having a rectangular cross section. A movable magnet support tube 13 and a stationary magnet support tube 12 are accommodated in the inner space of the guide tube 5.

【００２４】図１８に示すように、側壁６は厚さが均一
の磁性体であるマルテンサイト系ステンレス鋼板または
フエライト系ステンレス鋼板からなり、磁石１２，１３
に対向しない磁性部分６ａを温度８００℃以上に加熱し
た後、高温状態から急冷することにより非磁性または弱
磁性のオーステナイト相にする。したがつて、側壁の磁
性部分６に同極性の磁石１２，１３が対向する制動位置
では、１対の制動円板３の間に磁気回路ｗが形成され、
図１７に示すように、側壁の磁性部分６に異極性の磁石
１２，１３が対向する非制動位置では、１対の側壁の磁
性部分６の間に短絡的磁気回路ｚが生じ、制動円板３に
は磁界を及ぼさない。As shown in FIG. 18, the side wall 6 is made of a martensitic stainless steel plate or a ferrite stainless steel plate which is a magnetic material having a uniform thickness.
Is heated to a temperature of 800 ° C. or higher, and then rapidly cooled from a high temperature state to a nonmagnetic or weakly magnetic austenitic phase. Therefore, at the braking position where the magnets 12 and 13 of the same polarity face the magnetic portion 6 of the side wall, a magnetic circuit w is formed between the pair of braking disks 3 and
As shown in FIG. 17, in the non-braking position where the magnets 12 and 13 of different polarities face the magnetic portion 6 of the side wall, a short-circuit magnetic circuit z is generated between the magnetic portions 6 of the pair of side walls, and the braking disk is formed. 3 has no magnetic field.

【００２５】図１９，２０に示す実施例でも、案内筒５
の側壁を磁性体であるマルテンサイト系ステンレス鋼板
またはフエライト系ステンレス鋼板から構成し、側壁の
磁石１３，１２に対向しない磁性部分６ａを温度８００
℃以上に加熱した後、高温状態から急冷することにより
非磁性または弱磁性のオーステナイト相にするものであ
るが、マルテンサイト系ステンレス鋼板またはフエライ
ト系ステンレス鋼板からなる側壁が厚く、磁石１３，１
２に対向しない非磁性または弱磁性部分６ａの熱処理が
困難な場合に、予め熱処理した複数（図示の実施例では
３枚）の比較的薄いマルテンサイト系ステンレス鋼板ま
たはフエライト系ステンレス鋼板６Ａを重ね合せて側壁
を構成し、案内筒５に結合するようにしたものである。In the embodiment shown in FIGS.
Is made of a martensitic stainless steel plate or a ferrite stainless steel plate which is a magnetic material, and a magnetic portion 6a of the side wall which does not face the magnets 13 and 12 has a temperature of 800.
After heating to a temperature of at least ℃, the steel is rapidly cooled from a high temperature state to a non-magnetic or weakly magnetic austenitic phase, but the side walls made of a martensitic stainless steel sheet or a ferrite stainless steel sheet are thick,
When it is difficult to heat-treat the non-magnetic or weak-magnetic portion 6a that is not opposed to 2, a plurality of (three in the illustrated embodiment) relatively thin martensitic stainless steel sheets or ferrite stainless steel sheets 6A that have been heat-treated in advance are overlapped. Thus, the side wall is formed to be connected to the guide tube 5.

【００２６】図２０に示すように、周方向等間隔に配設
される磁石１３と磁石１３との間には、アルミニウムな
どの非磁性体を鋳込む代わりに、予めブロツク状に成形
した磁石１３と磁石１３の両面に軟磁性板３１を重ね合
せ、さらに軟磁性板３１と軟磁性板３１との間に非磁性
板３２を介装し、これらを内外１対の筒体からなる磁石
支持筒１０の内部に嵌挿する。この場合、軟磁性板３１
の軸方向寸法を他のものに比べて長くしてもよい。磁石
支持筒８についても同様に磁石１２と軟磁性板と非磁性
板とを組み合せ、内外１対の筒体からなる磁石支持筒１
０の内部に嵌挿する。As shown in FIG. 20, between the magnets 13 arranged at equal intervals in the circumferential direction, instead of casting a non-magnetic material such as aluminum, a magnet 13 previously formed into a block shape is used. And a magnet 13 on both sides of the magnet 13 and a non-magnetic plate 32 interposed between the soft magnetic plate 31 and the soft magnetic plate 31. 10. In this case, the soft magnetic plate 31
May be longer than those of the others. Similarly, the magnet support cylinder 8 is a combination of the magnet 12, the soft magnetic plate, and the non-magnetic plate, and is a magnet support cylinder 1 composed of a pair of inner and outer cylinders.
0.

【００２７】図１１に示す形式の渦電流減速装置や図１
３に示す形式の渦電流減速装置についても、案内筒５の
両側壁に１つまたは複数の肉厚が均一な磁性体であるマ
ルテンサイト系ステンレス鋼板またはフエライト系ステ
ンレス鋼板を用い、側壁の磁石１３，１２と対向しない
部分を温度８００℃以上の高温状態から急冷することに
より、非磁性または弱磁性のオーステナイト相に変態さ
せることができる。An eddy current reduction device of the type shown in FIG.
The eddy current reduction device of the type shown in FIG. 3 also employs one or more martensitic stainless steel plates or ferrite stainless steel plates, which are magnetic materials having a uniform thickness, on both side walls of the guide cylinder 5 and has magnets 13 on the side walls. , 12 can be transformed into a nonmagnetic or weakly magnetic austenitic phase by rapidly cooling from a high temperature state of 800 ° C. or higher.

【００２８】[0028]

【発明の効果】本発明は上述のように、回転軸に結合し
た１対の制動円板と、該制動円板の間の非回転部分に配
設されかつ断面長方形の内空部を有する非磁性体からな
る案内筒と、該案内筒の内空部に回動可能に支持した少
くとも１つの磁石支持輪と、該磁石支持輪に周方向等間
隔に支持した多数の磁石と、前記案内筒の両側壁の前記
各磁石と対向する部分に配設した強磁性板とを有し、前
記磁石からの磁界により渦電流に基づく制動力を前記制
動円板に発生させる渦電流減速装置において、前記案内
筒の両側壁を強磁性体であるステンレス鋼板から構成
し、両側壁の前記磁石と対向する部分により前記強磁性
板を形成し、両側壁の前記磁石と対向しない部分を、温
度８００℃以上に加熱した後に急冷して非磁性または弱
磁性のオーステナイト相にしたものであり、構成が簡単
であるから案内筒の製造が容易になり、従来構造のもの
とほぼ同等の制動性能が得られる。As described above, the present invention relates to a non-magnetic material having a pair of braking disks coupled to a rotating shaft and a hollow portion having a rectangular cross section disposed at a non-rotating portion between the braking disks. A guide cylinder comprising: at least one magnet support wheel rotatably supported in an inner space of the guide tube; a large number of magnets supported at equal circumferential intervals on the magnet support wheel; An eddy current reduction device that has a ferromagnetic plate disposed on a portion of each side wall facing each of the magnets, and generates a braking force based on an eddy current on the braking disk by a magnetic field from the magnet. Both side walls of the cylinder are made of a stainless steel plate that is a ferromagnetic material, and the ferromagnetic plate is formed by portions of both side walls facing the magnet, and portions of both side walls not facing the magnet are heated to a temperature of 800 ° C. or more. Non-magnetic or weak magnetic austenite Is obtained by the phase, the configuration is easy to manufacture the guide tube because it is simple, almost the same braking performance is obtained with the conventional structure.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明が適用される渦電流減速装置の正面断面
図である。FIG. 1 is a front sectional view of an eddy current reduction device to which the present invention is applied.

【図２】同渦電流減速装置の要部を示す側面断面図であ
る。FIG. 2 is a side sectional view showing a main part of the eddy current reduction device.

【図３】同渦電流減速装置を展開して示す平面断面図で
ある。FIG. 3 is a plan sectional view showing the eddy current reduction device in a developed state.

【図４】渦電流減速装置の部分的変更実施例を示す正面
断面図である。FIG. 4 is a front sectional view showing a partially modified embodiment of the eddy current reduction device.

【図５】渦電流減速装置の部分的変更実施例を示す正面
断面図である。FIG. 5 is a front sectional view showing a partially modified embodiment of the eddy current reduction device.

【図６】渦電流減速装置の部分的変更実施例を示す正面
断面図である。FIG. 6 is a front sectional view showing a partially modified embodiment of the eddy current reduction device.

【図７】渦電流減速装置の部分的変更実施例を示す正面
断面図である。FIG. 7 is a front sectional view showing a partially modified embodiment of the eddy current reduction device.

【図８】本発明の第２実施例に係る渦電流減速装置にお
ける案内筒の左側壁を展開して示す平面断面図である。FIG. 8 is a plan sectional view showing the left side wall of the guide tube in the eddy current reduction device according to the second embodiment of the present invention in a developed manner.

【図９】本発明の第３実施例に係る渦電流減速装置にお
ける案内筒の左側壁を展開して示す平面断面図である。FIG. 9 is a cross-sectional plan view showing the left side wall of the guide tube in the eddy current reduction device according to the third embodiment of the present invention.

【図１０】本発明の第４実施例に係る渦電流減速装置に
おける案内筒の左側壁を展開して示す平面断面図であ
る。FIG. 10 is an exploded plan sectional view showing a left side wall of a guide cylinder in an eddy current reduction device according to a fourth embodiment of the present invention.

【図１１】本発明が適用される他の渦電流減速装置の正
面断面図である。FIG. 11 is a front sectional view of another eddy current reduction device to which the present invention is applied.

【図１２】同渦電流減速装置を展開して示す平面断面図
である。FIG. 12 is a plan sectional view showing the eddy current reduction device in a developed state.

【図１３】本発明が適用される他の渦電流減速装置の正
面断面図である。FIG. 13 is a front sectional view of another eddy current reduction device to which the present invention is applied.

【図１４】同渦電流減速装置の非制動状態を展開して示
す平面断面図である。FIG. 14 is a cross-sectional plan view showing the non-braking state of the eddy current reduction device in an unfolded state.

【図１５】同渦電流減速装置の制動状態を展開して示す
平面断面図である。FIG. 15 is a cross-sectional plan view showing the braking state of the eddy current reduction device in a developed state.

【図１６】本発明が適用される他の渦電流減速装置を展
開して示す平面断面図である。FIG. 16 is an exploded plan view showing another eddy current reduction device to which the present invention is applied.

【図１７】本発明の第５実施例に係る渦電流減速装置の
正面断面図である。FIG. 17 is a front sectional view of an eddy current reduction device according to a fifth embodiment of the present invention.

【図１８】同渦電流減速装置を展開して示す平面断面図
である。FIG. 18 is a plan sectional view showing the eddy current reduction device in a developed state.

【図１９】本発明の第６実施例に係る渦電流減速装置の
案内筒の正面断面図である。FIG. 19 is a front sectional view of a guide cylinder of an eddy current reduction device according to a sixth embodiment of the present invention.

【図２０】同渦電流減速装置の案内筒を展開して示す平
面断面図である。FIG. 20 is a cross-sectional plan view showing the guide tube of the eddy current reduction device in a developed state.

【符号の説明】[Explanation of symbols]

２：回転軸 ３：制動円板 ４：軸受 ５：案内筒
６：磁性部分 ６ａ：非磁性または弱磁性部分 ８：磁
石支持輪 ８ａ：磁石支持輪 ９：軸受 １０：磁石支
持輪 １２，１２ａ：磁石 １３：磁石 １４：滑り板
１５：ピニオン１６：電動機 １８：部分歯車 １
９：環状溝 ２１：外筒 ２２：内筒 ２３：良伝導体
の環状体 ２４：良伝導体の環状体2: Rotary shaft 3: Brake disk 4: Bearing 5: Guide cylinder
6: Magnetic portion 6a: Non-magnetic or weak magnetic portion 8: Magnet support wheel 8a: Magnet support wheel 9: Bearing 10: Magnet support wheel 12, 12a: Magnet 13: Magnet 14: Sliding plate 15: Pinion 16: Electric motor 18: Partial gear 1
9: Annular groove 21: Outer cylinder 22: Inner cylinder 23: Good conductor ring 24: Good conductor ring

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】回転軸に結合した１対の制動円板と、該制
動円板の間の非回転部分に配設されかつ断面長方形の内
空部を有する非磁性体からなる案内筒と、該案内筒の内
空部に回動可能に支持した少くとも１つの磁石支持輪
と、該磁石支持輪に周方向等間隔に支持した多数の磁石
と、前記案内筒の両側壁の前記各磁石と対向する部分に
配設した強磁性板とを有し、前記磁石からの磁界により
渦電流に基づく制動力を前記制動円板に発生させる渦電
流減速装置において、前記案内筒の両側壁を強磁性体で
あるステンレス鋼板から構成し、両側壁の前記磁石と対
向する部分により前記強磁性板を形成し、両側壁の前記
磁石と対向しない部分を、温度８００℃以上に加熱した
後に急冷して非磁性または弱磁性のオーステナイト相に
したことを特徴とする渦電流減速装置。1. A guide cylinder made of a non-magnetic material having a pair of braking disks disposed on a non-rotating portion between the braking disks and a non-rotating portion and having a hollow section having a rectangular cross section. At least one magnet support wheel rotatably supported in the inner space of the tube, a large number of magnets supported at equal circumferential intervals on the magnet support wheel, and opposed to the magnets on both side walls of the guide tube. And a ferromagnetic plate disposed at a portion where the magnetic field from the magnet generates a braking force based on an eddy current in the braking disk. The ferromagnetic plate is formed by the portions of both side walls facing the magnets, and the portions of both side walls not facing the magnets are heated to a temperature of 800 ° C. or higher and then rapidly cooled to become non-magnetic. Or a weak magnetic austenitic phase. Eddy current reduction apparatus. 【請求項２】前記案内筒の両側壁を強磁性体であるステ
ンレス鋼板から構成し、両側壁の前記磁石と対向しない
部分の内面と外面の一方に軸方向の溝を設けて薄肉に形
成した、請求項１に記載の渦電流減速装置。2. Both side walls of said guide cylinder are made of a stainless steel plate which is a ferromagnetic material, and are formed to be thin by providing axial grooves on one of an inner surface and an outer surface of a portion of the both side walls which do not face said magnet. The eddy current reduction device according to claim 1. 【請求項３】前記制動円板の前記強磁性板と対向しない
内外周縁部の少くとも一方に、銅などの良伝導体からな
る環状体を備えた、請求項１に記載の渦電流減速装置。3. The eddy current reduction device according to claim 1, wherein an annular body made of a good conductor such as copper is provided on at least one of the inner and outer peripheral edges of the braking disk not facing the ferromagnetic plate. .