JP2002247834A - Eddy current decelerator - Google Patents
Eddy current deceleratorInfo
- Publication number
- JP2002247834A JP2002247834A JP2001040753A JP2001040753A JP2002247834A JP 2002247834 A JP2002247834 A JP 2002247834A JP 2001040753 A JP2001040753 A JP 2001040753A JP 2001040753 A JP2001040753 A JP 2001040753A JP 2002247834 A JP2002247834 A JP 2002247834A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- ferromagnetic
- cylinder
- eddy current
- guide cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は非制動時に磁石から
の洩れ磁界による引ずりトルクを抑制するようにした渦
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 which suppresses a drag torque due to a leakage magnetic field from a magnet when braking is not performed.
【０００２】[0002]
【従来の技術】永久磁石（以下、これを単に磁石とい
う）を用いた渦電流減速装置には特願昭６３−１２７６
９６号公報に開示されるようなドラム型のものと、特願
昭６３−１２７６９５号公報に開示されるような円板型
のものとが提案されているが、両者とも非制動時に磁石
からの磁界が強磁性部材相互の間から洩れ（希土類の強
力な磁石は外部へ出る磁界の直進性が強いので）、回転
体に入つて磁気的に引きずりトルクを発生する。引きず
りトルクを抑制する対策として、特願平５−３４８４８
号公報に開示されるドラム型の渦電流減速装置では、磁
石の磁極（外面）の周方向中央部にくぼみを設け、くぼ
みの内部に非磁性の補強板を重ね合せたり、磁性の弱い
補強材を結合したりして、磁石のくぼみ部分の強度を高
めるとともに、くぼみからの磁界の強さを弱め、強磁性
部材相互の間からの磁気洩れを防止している。2. Description of the Related Art Japanese Patent Application No. 63-1276 discloses an eddy current reduction device using a permanent magnet (hereinafter simply referred to as a magnet).
A drum type as disclosed in Japanese Patent Application Publication No. 96 and a disk type as disclosed in Japanese Patent Application No. 63-127695 have been proposed. The magnetic field leaks from between the ferromagnetic members (because a strong rare earth magnet has a strong linearity of the magnetic field going out), it enters the rotating body and magnetically generates a drag torque. As a countermeasure to suppress drag torque, Japanese Patent Application No. 5-34848.
In the drum type eddy current reduction device disclosed in Japanese Patent Application Laid-Open Publication No. H11-260, a recess is provided in the center of the magnetic pole (outer surface) of the magnet in the circumferential direction, a non-magnetic reinforcing plate is overlapped inside the recess, or a reinforcing material having weak magnetism To increase the strength of the concave portion of the magnet, reduce the strength of the magnetic field from the concave portion, and prevent magnetic leakage from between the ferromagnetic members.
【０００３】しかし、磁石のくぼみに非磁性の補強板を
備えたものは、非制動時強磁性部材相互の間を通過する
磁界を十分に抑え込むのは困難であり、くぼみを大きく
深くすると、制動時の磁界の強さが弱まるという問題が
ある。また、くぼみに磁性の弱い補強材を結合したもの
は、磁石の周方向中央部からの磁界をある程度抑え込
み、非制動時磁石の両側（回転体の回転方向の前後））
に位置する強磁性部材へある程度磁界を通し、強磁性部
材相互の間からの磁気洩れを防ぐがまだ不十分であり、
制動時の磁界の強さを低下させる。However, it is difficult to sufficiently suppress the magnetic field passing between the ferromagnetic members during non-braking when the magnet is provided with a non-magnetic reinforcing plate in the recess of the magnet. There is a problem that the strength of the magnetic field at the time is weakened. In addition, the magnetic material from the center in the circumferential direction of the magnet is suppressed to some extent, and both sides of the magnet at the time of non-braking (before and after the rotating direction of the rotating body) are obtained by combining a weak magnetic material into the hollow.
Pass a certain magnetic field to the ferromagnetic member located in the, to prevent magnetic leakage from between the ferromagnetic members, but still insufficient,
Reduces the strength of the magnetic field during braking.
【０００４】[0004]
【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、非制動時に各磁石の周方向中央部から磁界
が案内筒の外筒部の周方向に並ぶ強磁性部材の隙間を経
て制動ドラムに及ぶのを、より効果的に抑制するように
した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-described problems, the object of the present invention is to provide a gap between ferromagnetic members in which a magnetic field is arranged in the circumferential direction of the outer cylindrical portion of the guide cylinder from the circumferential central portion of each magnet when braking is not performed. An object of the present invention is to provide an eddy current reduction device that more effectively suppresses the influence on the brake drum through the eddy current reduction device.
【０００５】[0005]
【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制動ドラムの内部
に断面長方形の内空部を有する案内筒を配設し、該案内
筒の内空部に多数の磁石を周方向等間隔に結合する磁石
支持筒を正逆回動可能に支持し、前記案内筒の外筒部に
前記磁石と対向するように多数の強磁性板を配設し、前
記磁石から前記強磁性板を経て前記制動ドラムへ及ぶ磁
界により渦電流に基づく制動力を前記制動ドラムに発生
する渦電流減速装置において、前記磁石の前記強磁性板
に対向する外面の周方向中央部に設けた軸方向の溝に強
磁性板を結合したことを特徴とする。In order to solve the above-mentioned problems, according to the structure of the present invention, a guide cylinder having an inner space with a rectangular cross section is provided inside a brake drum connected to a rotating shaft. A magnet support cylinder that couples a number of magnets at equal intervals in the circumferential direction is supported in the inner space so as to be able to rotate forward and backward, and a number of ferromagnetic plates are provided on the outer cylinder part of the guide cylinder so as to face the magnets. An eddy current reduction device arranged to generate a braking force based on an eddy current on the braking drum by a magnetic field extending from the magnet through the ferromagnetic plate to the braking drum, wherein an outer surface of the magnet facing the ferromagnetic plate Is characterized in that a ferromagnetic plate is coupled to an axial groove provided at the center in the circumferential direction.
【０００６】[0006]
【発明の実施の形態】本発明では磁石の外面の周方向中
央部に設けた軸方向の溝に強磁性板を結合する。非制動
位置で磁石の周方向中央部からの磁界は、強磁性板を経
て強磁性部材へ流れ込み、強磁性部材相互の隙間から回
転体としての制動ドラムまたは制動円板への磁気洩れが
なくなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a ferromagnetic plate is coupled to an axial groove provided at a circumferentially central portion of an outer surface of a magnet. At the non-braking position, the magnetic field from the central portion in the circumferential direction of the magnet flows into the ferromagnetic member via the ferromagnetic plate, and magnetic leakage from the gap between the ferromagnetic members to the braking drum or the braking disk as a rotating body is eliminated.
【０００７】[0007]
【実施例】図１に示すように、ドラム型の渦電流減速装
置は回転軸１に結合した制動ドラム７と、制動ドラム７
の内部に配置される断面長方形の内空部を有する非磁性
体からなる案内筒１０と、案内筒１０の内空部に正逆回
動可能に支持した磁石支持筒１４とを備えている。外周
面に多数の冷却フイン８を有する制動ドラム７は回転軸
１に結合したボス部５から放射方向に延びる多数の支持
腕６の先端に一端部を結合される。案内筒１０は例えば
車両用変速機の壁部に固定されるものであり、外筒部１
０ａに周方向等間隔に板状の強磁性部材１５が結合され
る。好ましくは、強磁性部材１５はアルミニウムから案
内筒１０を鋳造する時に鋳込まれる。強磁性体からなる
磁石支持筒１４は案内筒１０の内筒部１０ｂに滑り軸受
１２を介して、また側壁にスラスト軸受１２ａを介して
支持され、磁石支持筒１４から案内筒１０の側壁のスロ
ツト１０ｃを経て外部へ突出するロツド１６が流体圧ア
クチユエータのロツド１７ａに連結される。アクチユエ
ータ２０はシリンダ１８にピストン１７を嵌装して両端
に流体室を区画され、ピストン１７からロツド１７ａが
外部へ突出される。磁石支持筒１４の外周面には磁石２
４が周方向等間隔にかつ強磁性部材１５に対向する極性
が周方向に交互に異なるように結合される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a drum type eddy current reduction device includes a braking drum 7 connected to a rotating shaft 1 and a braking drum 7.
A guide tube 10 made of a non-magnetic material and having an inner space with a rectangular cross section disposed inside the guide tube 10 and a magnet support tube 14 supported in the inner space of the guide tube 10 so as to be able to rotate forward and backward. One end of a braking drum 7 having a large number of cooling fins 8 on its outer peripheral surface is connected to tips of a large number of support arms 6 extending radially from a boss 5 connected to the rotating shaft 1. The guide cylinder 10 is fixed to, for example, a wall of a vehicle transmission, and the outer cylinder 1
A plate-like ferromagnetic member 15 is connected to the outer periphery 0a at equal intervals in the circumferential direction. Preferably, the ferromagnetic member 15 is cast when casting the guide tube 10 from aluminum. The magnet support cylinder 14 made of a ferromagnetic material is supported by the inner cylinder portion 10b of the guide cylinder 10 via the sliding bearing 12 and on the side wall via the thrust bearing 12a. A rod 16 protruding to the outside via 10c is connected to a rod 17a of the hydraulic actuator. The actuator 20 has a piston 17 fitted in a cylinder 18 to define fluid chambers at both ends, and a rod 17a projects from the piston 17 to the outside. The magnet 2 is provided on the outer peripheral surface of the magnet support tube 14.
4 are connected at equal intervals in the circumferential direction so that the polarities facing the ferromagnetic member 15 are alternately different in the circumferential direction.
【０００８】図２に示すように、各磁石２４の周方向の
両端部には段部３５が形成され、周方向に並ぶ磁石２４
の段部３５の間へ非磁性体からなる止め具３６が介装さ
れ、ボルト３７により磁石支持筒１４へ締結される。図
２に示す制動位置では、各磁石２４が強磁性部材１５に
全面的に重なる。この時、磁石２４からの磁界は強磁性
部材１５を経て制動ドラム７へ達し、制動ドラム７と磁
石支持筒１４との間には磁気回路ｗが形成される。回転
する制動ドラム７が磁石２４からの磁界を受ける時、ア
クチユエータ２０により渦電流に基づく制動トルクを発
生する。As shown in FIG. 2, step portions 35 are formed at both ends in the circumferential direction of each magnet 24, and the magnets 24 arranged in the circumferential direction are formed.
A stop 36 made of a non-magnetic material is interposed between the step portions 35 of the first and second portions, and fastened to the magnet support tube 14 by bolts 37. In the braking position shown in FIG. 2, each magnet 24 entirely overlaps the ferromagnetic member 15. At this time, the magnetic field from the magnet 24 reaches the brake drum 7 via the ferromagnetic member 15, and a magnetic circuit w is formed between the brake drum 7 and the magnet support cylinder 14. When the rotating braking drum 7 receives a magnetic field from the magnet 24, the actuator 20 generates a braking torque based on the eddy current.
【０００９】アクチユエータ２０により磁石支持筒１４
を磁石２４の半配列ピツチだけ回動すると、図３に示す
ように、周方向に並ぶ２つの磁石２４が強磁性部材１５
に部分的に重なり、強磁性部材１５と磁石支持筒１４と
の間に短絡的磁気回路ｚが生じ、制動ドラム７は制動ト
ルクを発生しない。しかし、磁石２４の外面から制動ド
ラム７へ向かう磁界の方向は、磁石２４が強力であるほ
ど曲線性をもつので、各磁石２４の周方向中央部からの
磁界が非磁性体の外筒部１０ａを経て制動ドラム７に達
すると、制動ドラム７が引きずりトルクを発生する。The magnet support tube 14 is actuated by the actuator 20.
When the magnet 24 is rotated by a half pitch of the magnet 24, the two magnets 24 arranged in the circumferential direction as shown in FIG.
, A short-circuit magnetic circuit z is generated between the ferromagnetic member 15 and the magnet support cylinder 14, and the braking drum 7 does not generate a braking torque. However, the direction of the magnetic field from the outer surface of the magnet 24 toward the braking drum 7 is more curved as the magnet 24 is stronger, so that the magnetic field from the center in the circumferential direction of each magnet 24 is reduced by the non-magnetic outer cylindrical portion 10a. When the brake drum 7 reaches the brake drum 7 via the above, the brake drum 7 generates a drag torque.
【００１０】本発明では、引きずりトルクを抑制するた
めに、磁石２４の周方向中央部に設けた軸方向の溝に、
強磁性板３４を埋め込むなどして結合したものであり、
強磁性板３４が周方向に並ぶ強磁性部材１５の間を連絡
し、磁石２４の周方向中央部からの磁界が強磁性板３４
により隣りの強磁性部材１５へ誘導され、制動ドラム７
に達しないようにしたものである。In the present invention, in order to suppress the drag torque, an axial groove provided in a circumferentially central portion of the magnet 24 is provided with:
The ferromagnetic plate 34 is connected by embedding, for example,
The ferromagnetic plate 34 communicates between the ferromagnetic members 15 arranged in the circumferential direction, and a magnetic field from the circumferential center of the magnet 24 is applied to the ferromagnetic plate 34.
Is guided to the adjacent ferromagnetic member 15 by the
Is not reached.
【００１１】図４に示すように、強磁性板３４の周方向
寸法ｂは強磁性部材１５の相互の間隔ａよりも狭くても
よいが、好ましくは、周方向寸法ｂは間隔ａよりも大き
くすれば、磁石２４から制動ドラム７への洩れ磁界を完
全に防止することができる。しかし、図２に示すよう
に、強磁性部材１５の相互の間隔ａ（図４を参照）をあ
まり狭くすると、制動時にも磁気回路ｗを構成する磁界
の一部が強磁性部材１５の間で短絡し、制動能力が減殺
される恐れがあるので、周方向寸法ｂと間隔ａの関係は
実験的に求められる。図６に示すように、磁石２４の外
面の周方向中央部に設ける溝３４ａの幅は、強磁性板３
４と同寸でもよいが、図７に示すように、溝３４ａの幅
（周方向寸法）を強磁性板３４の幅よりも長くしてもよ
く、この場合は磁石２４の周方向中央部と制動ドラム７
との間隔が広くなり、制動ドラム７へ到達する磁界を弱
めるだけでなく、強磁性板３４が磁界を強磁性部材１５
へ誘導する（湾曲させる）。As shown in FIG. 4, the circumferential dimension b of the ferromagnetic plate 34 may be smaller than the distance a between the ferromagnetic members 15, but preferably the circumferential dimension b is larger than the distance a. Then, the leakage magnetic field from the magnet 24 to the braking drum 7 can be completely prevented. However, as shown in FIG. 2, if the distance a between the ferromagnetic members 15 (see FIG. 4) is too small, a part of the magnetic field forming the magnetic circuit w will be generated between the ferromagnetic members 15 even during braking. The relationship between the circumferential dimension b and the distance a is experimentally determined because a short circuit may occur and the braking capacity may be reduced. As shown in FIG. 6, the width of the groove 34a provided at the center in the circumferential direction of the outer surface of the magnet 24 is
4, the width (circumferential dimension) of the groove 34a may be longer than the width of the ferromagnetic plate 34. Brake drum 7
Not only weakens the magnetic field reaching the braking drum 7, but also causes the ferromagnetic plate 34 to
To guide (bend).
【００１２】磁石支持筒１４に対する磁石２４の結合手
段については図２に示したが、図８に示すように、磁石
支持筒１４の外周面に設けた磁石２４の軸方向寸法と同
幅の周方向の溝１４ａに磁石２４を係合し、磁石２４の
溝３４ａに強磁性板３４を重ね合せたうえ、１本または
２本のボルト４１により磁石支持筒１４へ締結するよう
にしてもよい。The means for coupling the magnet 24 to the magnet support tube 14 is shown in FIG. 2. As shown in FIG. 8, however, a circumferential portion having the same width as the axial dimension of the magnet 24 provided on the outer peripheral surface of the magnet support tube 14 is used. The magnet 24 may be engaged with the groove 14a in the direction, the ferromagnetic plate 34 may be overlapped with the groove 34a of the magnet 24, and then fastened to the magnet support tube 14 by one or two bolts 41.
【００１３】図９に示すように、案内筒１０の外筒部１
０ａは、磁性体である鉄から鍛造または鋳造により、厚
肉部分と薄肉部分を周方向に交互に形成し、厚肉部分を
強磁性部材１５とし、薄肉部分にニツケルを溶け込ませ
て非磁性のオーステナイト組織（部分１５ａに相当）に
変化させるようにしてもよい。また、肉厚が均等な外筒
部１０ａをマルテンサイトまたはフエライト組織のステ
ンレス鋼から形成し、熱処理により強磁性部と非磁性部
または弱磁性部を形成するようにしてもよい。As shown in FIG. 9, the outer cylinder portion 1 of the guide cylinder 10
In the case of 0a, a thick portion and a thin portion are alternately formed in the circumferential direction by forging or casting from iron which is a magnetic material, the thick portion is a ferromagnetic member 15, and nickel is melted into the thin portion to form a non-magnetic material. The structure may be changed to an austenitic structure (corresponding to the portion 15a). Alternatively, the outer cylindrical portion 10a having a uniform thickness may be formed from stainless steel having a martensite or ferrite structure, and a ferromagnetic portion and a nonmagnetic portion or a weak magnetic portion may be formed by heat treatment.
【００１４】図１０に示す実施例では、外筒部１０ａの
強磁性部材１５の周方向の端壁面に、強磁性部材１５の
内面に沿つて周方向へ延びる突片１５ｂを設けたもので
ある。換言すれば、強磁性部材１５の相互間隔を外周側
では広くし、内周側へ至るにつれて次第に狭くなるよう
に構成する。磁石支持筒１４の非制動位置で、磁石２４
の周方向中央部からの磁界は、強磁性板３４により強磁
性部材１５へ誘導され、制動ドラム７には達しない。In the embodiment shown in FIG. 10, a protruding piece 15b extending in the circumferential direction along the inner surface of the ferromagnetic member 15 is provided on the circumferential end wall of the ferromagnetic member 15 of the outer cylindrical portion 10a. . In other words, the mutual interval of the ferromagnetic members 15 is configured to be wide on the outer peripheral side and gradually narrower toward the inner peripheral side. In the non-braking position of the magnet support tube 14, the magnet 24
Is guided to the ferromagnetic member 15 by the ferromagnetic plate 34 and does not reach the braking drum 7.
【００１５】図１１に示す実施例では、磁石２４に対す
る強磁性板３４の構成と作用効果については既に述べた
とおりであるが、外筒部１０ａの強磁性部材１５の周方
向の端壁面１５ｃ，１５ｄを径方向の平坦面ではなく傾
斜面とし、端壁面１５ｃ，１５ｄが径方向に間隔を存し
て僅かに重なり合うように構成される。磁石支持筒１４
の非制動位置で、磁石２４の周方向中央部から制動ドラ
ム７へ向かう磁界が端壁面１５ｃ，１５ｄで遮られるの
で、引きずりトルクが抑えられる。In the embodiment shown in FIG. 11, the structure and operation and effect of the ferromagnetic plate 34 with respect to the magnet 24 are as described above, but the circumferential end wall surfaces 15c and 15c of the ferromagnetic member 15 of the outer cylinder 10a are described. 15d is not a flat surface in the radial direction but an inclined surface, and the end wall surfaces 15c and 15d are configured to slightly overlap with an interval in the radial direction. Magnet support tube 14
In the non-braking position, the magnetic field from the center in the circumferential direction of the magnet 24 toward the braking drum 7 is blocked by the end wall surfaces 15c and 15d, so that the drag torque is suppressed.
【００１６】図１２，１３に示すように、本発明は円板
型の渦電流減速装置にも適用される。円板型の渦電流減
速装置では回転軸５２に左右１対の制動円板５３が結合
され、両者の間に断面長方形の内空部を有する非磁性体
からなる案内筒５５が配設され、案内筒５５の内空部に
磁石支持筒６３が正逆回動可能に支持される。図示して
ないが、案内筒５５は車体の非回転部分に固定される。
制動円板５３は冷却のための導風路５３ｃを備えられ、
ボス部５３ａを回転軸５２にスプライン嵌合されかつ軸
方向に移動しないように固定される。回転軸５２に軸受
５４により相対回動可能に支持されたボス部５５ａか
ら、複数のスポーク５５ｂが放射方向に延出され、スポ
ーク５５ｂの先端に案内筒５５が結合される。案内筒５
５の両側壁５５ｃには、制動円板５３に対向する扇形な
いし台形の板からなる強磁性部材５６が周方向等間隔に
結合される。As shown in FIGS. 12 and 13, the present invention is also applied to a disk type eddy current reduction device. In the disk-type eddy current reduction device, a pair of left and right braking disks 53 are coupled to the rotating shaft 52, and a guide cylinder 55 made of a nonmagnetic material having an inner space with a rectangular cross section is disposed between the two. A magnet support cylinder 63 is supported in the inner space of the guide cylinder 55 so as to be able to rotate forward and backward. Although not shown, the guide cylinder 55 is fixed to a non-rotating portion of the vehicle body.
The braking disk 53 is provided with an air guide path 53c for cooling,
The boss 53a is spline-fitted to the rotating shaft 52 and fixed so as not to move in the axial direction. A plurality of spokes 55b extend in a radial direction from a boss portion 55a supported by the rotating shaft 52 so as to be relatively rotatable by a bearing 54, and a guide cylinder 55 is coupled to a tip of the spoke 55b. Guide tube 5
A ferromagnetic member 56 formed of a fan-shaped or trapezoidal plate facing the braking disk 53 is connected to the both side walls 55c at equal circumferential intervals.
【００１７】磁石支持筒６３は非磁性体からなる外筒６
０と内筒５８との間に、強磁性部材５６と同数の磁石６
２を周方向等間隔に結合され、内筒５８が軸受５７によ
り案内筒５５の内筒部に支持される。磁石６２は左右の
強磁性部材５６に対向する極性が周方向に交互に逆にな
るように配される。好ましくは、磁石６２の両側面に滑
り板６４が結合され、強磁性部材５６との間で円滑な滑
りが得られるようになつている。The magnet support cylinder 63 is made of an outer cylinder 6 made of a non-magnetic material.
0 and the inner cylinder 58, the same number of magnets 6 as the ferromagnetic member 56.
2 are connected at equal intervals in the circumferential direction, and the inner cylinder 58 is supported by the inner cylinder portion of the guide cylinder 55 by the bearing 57. The magnets 62 are arranged so that the polarities facing the left and right ferromagnetic members 56 are alternately reversed in the circumferential direction. Preferably, sliding plates 64 are connected to both side surfaces of the magnet 62 so that smooth sliding with the ferromagnetic member 56 can be obtained.
【００１８】本実施例では磁石支持筒６３の非制動位置
で、磁石６２の周方向中央部から強磁性部材５６と強磁
性部材５６の隙間を経て制動円板５３へ磁界が洩れるの
を防止するために、磁石６２の両側面の周方向中央部に
設けた径方向溝に強磁性板７０が結合される。磁石支持
筒６３の非制動位置で、磁石６２の周方向中央部から制
動円板５３へ向かう磁界は、強磁性板７０により強磁性
部材５６へ誘導されて短絡的磁気回路ｚを形成する。In this embodiment, at the non-braking position of the magnet support cylinder 63, it is possible to prevent a magnetic field from leaking from the central portion in the circumferential direction of the magnet 62 to the braking disk 53 through the gap between the ferromagnetic members 56. To this end, the ferromagnetic plate 70 is coupled to radial grooves provided at the center in the circumferential direction on both side surfaces of the magnet 62. At the non-braking position of the magnet support cylinder 63, the magnetic field from the center in the circumferential direction of the magnet 62 toward the braking disk 53 is guided by the ferromagnetic plate 70 to the ferromagnetic member 56 to form a short-circuit magnetic circuit z.
【００１９】[0019]
【発明の効果】本発明は上述のように、回転軸に結合し
た制動ドラムの内部に断面長方形の内空部を有する案内
筒を配設し、該案内筒の内空部に多数の磁石を周方向等
間隔に結合する磁石支持筒を正逆回動可能に支持し、前
記案内筒の外筒部に前記磁石と対向するように多数の強
磁性板を配設し、前記磁石から前記強磁性板を経て前記
制動ドラムへ及ぶ磁界により渦電流に基づく制動力を前
記制動ドラムに発生する渦電流減速装置において、前記
磁石の前記強磁性板に対向する外面の周方向中央部に設
けた軸方向の溝に強磁性板を結合したものであり、非制
動位置で磁石の周方向中央部からの磁界は、強磁性板を
経て強磁性部材へ流れ込み、強磁性部材相互の隙間から
制動ドラムまたは制動円板への磁気洩れがなくなり、引
きずりトルクが抑えられる。As described above, according to the present invention, a guide cylinder having a hollow section having a rectangular cross section is disposed inside a brake drum connected to a rotating shaft, and a large number of magnets are provided in the hollow section of the guide cylinder. A magnet support cylinder coupled at equal intervals in the circumferential direction is supported so as to be able to rotate forward and backward, and a large number of ferromagnetic plates are arranged on the outer cylinder portion of the guide cylinder so as to face the magnet. In an eddy current reduction device for generating a braking force based on an eddy current on the braking drum by a magnetic field reaching the braking drum via a magnetic plate, a shaft provided at a circumferentially central portion of an outer surface of the magnet opposed to the ferromagnetic plate. In the non-braking position, the magnetic field from the center in the circumferential direction of the magnet flows into the ferromagnetic member through the ferromagnetic plate, and the braking drum or Eliminates magnetic leakage to the braking disk and reduces drag torque It is.
【図１】本発明に係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 according to the present invention.
【図２】同渦電流減速装置の制動時の側面断面図であ
る。FIG. 2 is a side sectional view of the eddy current reduction device during braking.
【図３】同渦電流減速装置の非制動時の側面断面図であ
る。FIG. 3 is a side sectional view of the eddy current reduction device when no braking is performed.
【図４】強磁性部材相互の隙間と磁石に配設される強磁
性板との寸法関係を表す側面断面図である。FIG. 4 is a side sectional view showing a dimensional relationship between a gap between ferromagnetic members and a ferromagnetic plate provided on a magnet.
【図５】強磁性部材相互の隙間と磁石に配設される強磁
性板との寸法関係を表す側面断面図である。FIG. 5 is a side sectional view showing a dimensional relationship between a gap between ferromagnetic members and a ferromagnetic plate provided on a magnet.
【図６】磁石の溝と強磁性板との関係を示す側面図であ
る。FIG. 6 is a side view showing a relationship between a groove of a magnet and a ferromagnetic plate.
【図７】磁石の溝と強磁性板との関係を示す側面図であ
る。FIG. 7 is a side view showing a relationship between a groove of a magnet and a ferromagnetic plate.
【図８】磁石支持筒に対する磁石の支持構造を示す側面
断面図である。FIG. 8 is a side sectional view showing a structure for supporting a magnet with respect to a magnet support cylinder.
【図９】案内筒の外筒部の側面断面図である。FIG. 9 is a side sectional view of an outer tube portion of the guide tube.
【図１０】案内筒の外筒部の強磁性部材と磁石との関係
を示す側面断面図である。FIG. 10 is a side sectional view showing a relationship between a ferromagnetic member and a magnet in an outer cylinder portion of the guide cylinder.
【図１１】案内筒の外筒部の強磁性部材と磁石との関係
を示す側面断面図である。FIG. 11 is a side sectional view showing a relationship between a magnet and a ferromagnetic member of an outer cylinder portion of the guide cylinder.
【図１２】制動円板型の渦電流減速装置の正面断面図で
ある。FIG. 12 is a front sectional view of a braking disk type eddy current reduction device.
【図１３】同渦電流減速装置を周方向に展開して示す平
面断面図である。FIG. 13 is a plan sectional view showing the eddy current reduction device developed in a circumferential direction.
１：回転軸 ５：ボス部 ６：支持腕 ７：制動ドラム
８：冷却フイン １０：案内筒 １０ａ：外筒部 １
０ｂ：内筒部 １２：滑り軸受 １２ａ：スラスト軸受
１４ａ：溝 １４：磁石支持筒 １５：強磁性部材
１５ｂ：突片 １５ｃ，１５ｄ：端壁面 ２０：アクチ
ユエータ ２４：磁石 ３４：強磁性板３４ａ：溝 ５
２：回転軸 ５３：制動円板 ５３ａ：ボス部 ５４：
軸受 ５３ｃ：導風路 ５５：案内筒 ５５ａ：ボス部
５６：強磁性部材 ５５ｂ：スポーク ５７：軸受
５５ｃ：側壁 ５８：内筒 ６２：磁石 ６３：磁石支
持筒 ６４：滑り板 ７０：強磁性板1: rotating shaft 5: boss 6: support arm 7: braking drum 8: cooling fin 10: guide cylinder 10a: outer cylinder 1
0b: Inner cylinder part 12: Sliding bearing 12a: Thrust bearing 14a: Groove 14: Magnet support cylinder 15: Ferromagnetic member
15b: protruding piece 15c, 15d: end wall surface 20: actuator 24: magnet 34: ferromagnetic plate 34a: groove 5
2: rotating shaft 53: braking disk 53a: boss 54:
Bearing 53c: Wind guide path 55: Guide cylinder 55a: Boss part 56: Ferromagnetic member 55b: Spoke 57: Bearing
55c: Side wall 58: Inner cylinder 62: Magnet 63: Magnet support cylinder 64: Sliding plate 70: Ferromagnetic plate
Claims (4)
長方形の内空部を有する案内筒を配設し、該案内筒の内
空部に多数の磁石を周方向等間隔に結合する磁石支持筒
を正逆回動可能に支持し、前記案内筒の外筒部に前記磁
石と対向するように多数の強磁性板を配設し、前記磁石
から前記強磁性板を経て前記制動ドラムへ及ぶ磁界によ
り渦電流に基づく制動力を前記制動ドラムに発生する渦
電流減速装置において、前記磁石の前記強磁性板に対向
する外面の周方向中央部に設けた軸方向の溝に強磁性板
を結合したことを特徴とする渦電流減速装置。1. A magnet having a guide cylinder having a hollow section having a rectangular cross section disposed inside a brake drum connected to a rotating shaft, and a plurality of magnets being connected to the inner space of the guide cylinder at equal circumferential intervals. The support cylinder is supported so as to be able to rotate forward and backward, and a large number of ferromagnetic plates are arranged on the outer cylinder portion of the guide cylinder so as to face the magnet, and from the magnet to the brake drum via the ferromagnetic plate. In the eddy current reduction device for generating a braking force based on an eddy current on the braking drum by an applied magnetic field, a ferromagnetic plate is provided in an axial groove provided at a circumferentially central portion of an outer surface of the magnet facing the ferromagnetic plate. An eddy current reduction device characterized by being coupled.
の強磁性部材相互の間隔よりも広くなつている、請求項
１に記載の渦電流減速装置。2. The eddy current reduction device according to claim 1, wherein a circumferential dimension of the ferromagnetic plate is larger than a distance between the ferromagnetic members of the outer cylindrical portion.
の強磁性部材相互の間隔よりも狭くなつている、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 a circumferential dimension of the ferromagnetic plate is smaller than a distance between the ferromagnetic members of the outer cylinder.
に非磁性体からなる断面長方形の内空部を有する不動の
案内筒を配設し、該案内筒の制動円板と対向する両側壁
に多数の強磁性部材を周方向等間隔に結合し、前記案内
筒の内空部に多数の磁石を周方向等間隔に結合する磁石
支持筒を正逆回動可能に支持し、前記磁石支持筒の強磁
性部材に磁石が全面的に対向する制動位置と、前記磁石
支持筒の強磁性部材に２つの磁石が部分的に対向する非
制動位置とに前記磁石支持筒を回動する手段を備えた渦
電流減速装置において、前記磁石の前記強磁性板に対向
する外面の周方向中央部に設けた軸方向の溝に強磁性板
を結合したことを特徴とする渦電流減速装置。4. An immovable guide cylinder having an inner space with a rectangular cross section made of a non-magnetic material is disposed between a pair of left and right brake discs coupled to the rotating shaft, and opposes the brake disc of the guide cylinder. A large number of ferromagnetic members are coupled to the both side walls at equal circumferential intervals, and a magnet support cylinder that couples a large number of magnets at equal circumferential intervals to the inner space of the guide cylinder is rotatably supported in forward and reverse directions. The magnet support tube is rotated between a braking position where the magnet entirely faces the ferromagnetic member of the magnet support tube and a non-braking position where two magnets partially face the ferromagnetic member of the magnet support tube. An eddy current reduction device provided with means, wherein a ferromagnetic plate is coupled to an axial groove provided at a circumferentially central portion of an outer surface of the magnet facing the ferromagnetic plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001040753A JP3770092B2 (en) | 2001-02-16 | 2001-02-16 | Eddy current reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001040753A JP3770092B2 (en) | 2001-02-16 | 2001-02-16 | Eddy current reducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002247834A true JP2002247834A (en) | 2002-08-30 |
| JP3770092B2 JP3770092B2 (en) | 2006-04-26 |
Family
ID=18903299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001040753A Expired - Fee Related JP3770092B2 (en) | 2001-02-16 | 2001-02-16 | Eddy current reducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3770092B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110992A (en) * | 2017-11-29 | 2018-06-01 | 东南大学 | A kind of translation ring-like built-in type permanent-magnet eddy speed regulating device of stator |
-
2001
- 2001-02-16 JP JP2001040753A patent/JP3770092B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110992A (en) * | 2017-11-29 | 2018-06-01 | 东南大学 | A kind of translation ring-like built-in type permanent-magnet eddy speed regulating device of stator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3770092B2 (en) | 2006-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1993009590A1 (en) | Eddy current type retarder | |
| JP2000116108A (en) | Fddy-current reduction gear | |
| JP3651255B2 (en) | Eddy current reducer | |
| JPH0488867A (en) | Eddy current type reduction gear | |
| JPH11289747A (en) | Eddy-current flow reduction gear | |
| JP2002247834A (en) | Eddy current decelerator | |
| JP3690471B2 (en) | Eddy current reducer | |
| JP3285059B2 (en) | Eddy current type reduction gear | |
| JPH07245933A (en) | Eddy current type reduction gear | |
| JP3809771B2 (en) | Eddy current reducer | |
| JP3882397B2 (en) | Eddy current reducer | |
| JP3704946B2 (en) | Permanent magnet type eddy current reducer | |
| JP3233166B2 (en) | Eddy current type reduction gear | |
| JP3755717B2 (en) | Eddy current reducer | |
| JP2002354781A (en) | Eddy current speed reducing apparatus | |
| JP3959594B2 (en) | Eddy current reducer | |
| JP2550818B2 (en) | Eddy current type speed reducer | |
| JP2001327154A (en) | Eddy current reduction gear | |
| JP3656444B2 (en) | Eddy current reducer | |
| JP2573695Y2 (en) | Eddy current type reduction gear | |
| JP2001037205A (en) | Eddy current decelerating device | |
| JP3882410B2 (en) | Eddy current reducer | |
| JPH05284723A (en) | Eddy current type reduction gear | |
| JP2000358357A (en) | Eddy current decelerator | |
| JP2002315299A (en) | Eddy current type reduction gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040818 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060104 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060117 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20060130 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100217 Year of fee payment: 4 |
|
| LAPS | Cancellation because of no payment of annual fees |