JP2000102240A - Eddy current decelerator - Google Patents
Eddy current deceleratorInfo
- Publication number
- JP2000102240A JP2000102240A JP10268272A JP26827298A JP2000102240A JP 2000102240 A JP2000102240 A JP 2000102240A JP 10268272 A JP10268272 A JP 10268272A JP 26827298 A JP26827298 A JP 26827298A JP 2000102240 A JP2000102240 A JP 2000102240A
- Authority
- JP
- Japan
- Prior art keywords
- ferromagnetic plate
- circumferential direction
- ferromagnetic
- guide cylinder
- magnets
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Electric Propulsion And Braking For Vehicles (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は大形車両などの摩擦
ブレーキの負担を軽減する渦電流減速装置、特に永久磁
石（以下、これを単に磁石という）の磁束が制動ドラム
へ有効に働く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 for reducing the load on a friction brake of a large vehicle or the like, and more particularly, to a method in which a magnetic flux of a permanent magnet (hereinafter, simply referred to as a magnet) works effectively on a braking drum. The present invention relates to a reduced eddy current reduction device.
【０００２】[0002]
【従来の技術】特開平4-88867 号公報に開示される渦電
流減速装置では、図５に示すように、例えば車両用変速
機の出力回転軸１に結合される導体からなる制動ドラム
７と、制動ドラム７の内部に配設される非磁性体からな
る案内筒１０と、案内筒１０の内空部に回動可能に支持
した磁性体からなる磁石支持筒１４とを備えている。制
動ドラム７はボス５のフランジ部５ａを、駐車ブレーキ
の制動ドラム３の端壁部と一緒に、回転軸１にスプライ
ン嵌合固定した取付フランジ２に重ね合され、かつボル
ト４により締結される。ボス５から放射状に延びるスポ
ーク６に、放熱フイン８を備えた制動ドラム７が結合さ
れる。2. Description of the Related Art In an eddy current reduction device disclosed in Japanese Patent Laying-Open No. 4-88867, as shown in FIG. 5, for example, a braking drum 7 composed of a conductor coupled to an output rotation shaft 1 of a vehicle transmission is provided. A guide tube 10 made of a non-magnetic material, and a magnet support tube 14 made of a magnetic material rotatably supported in the inner space of the guide tube 10. The brake drum 7 overlaps the flange portion 5a of the boss 5 with the end wall portion of the brake drum 3 of the parking brake on the mounting flange 2 which is spline-fitted and fixed to the rotating shaft 1 and is fastened by the bolt 4. . A braking drum 7 having a heat dissipating fin 8 is connected to a spoke 6 extending radially from the boss 5.
【０００３】案内筒１０は断面長方形の内空部を備えて
おり、具体的には断面コ字形をなす筒体に、環状の蓋板
１１を結合して構成される。案内筒１０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１０の
外筒部１０ａに周方向等間隔に設けた多数の開口１３
に、強磁性板（ポールピース）１５がそれぞれ結合され
る。好ましくは、強磁性板１５は案内筒１０の成形時鋳
ぐるまれる。磁石支持筒１４は案内筒１０の内空部、詳
しくは内筒部１０ｂに軸受１２により回動可能に支持さ
れる。The guide tube 10 has an inner space with a rectangular cross section. Specifically, the guide tube 10 is formed by connecting an annular cover plate 11 to a cylindrical body having a U-shaped cross section. The guide tube 10 is fixed by a suitable means, for example, to a gearbox of a transmission. A large number of openings 13 provided at equal intervals in the circumferential direction in the outer cylinder portion 10a of the guide cylinder 10.
, Ferromagnetic plates (pole pieces) 15 are respectively coupled. Preferably, the ferromagnetic plate 15 is cast when the guide tube 10 is formed. The magnet support tube 14 is rotatably supported by the bearing 12 in the inner space of the guide tube 10, specifically, in the inner tube portion 10 b.
【０００４】案内筒１０の左端壁に、好ましくは３つの
流体圧アクチユエータ２０が周方向等間隔に結合され
る。流体圧アクチユエータ２０はシリンダ１８にピスト
ン１７を嵌装してなり、ピストン１７から外部へ突出す
るロツドに、磁石支持筒１４から案内筒１０の左端壁の
スリツトを経て突出する腕１６が連結される。磁石支持
筒１４に強磁性板１５の約半分の面積で倍数の磁石１４
ａが、強磁性板１５の配列ピツチの１／２の配列ピツチ
で周方向等間隔に結合される。図６に示すように、磁石
支持筒１４はアルミニウムなどの非磁性体からなり、多
数の磁石１４ａが、強磁性板１５と対向しかつ強磁性板
１５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。[0004] To the left end wall of the guide tube 10, preferably three fluid pressure actuators 20 are connected at equal intervals in the circumferential direction. The fluid pressure actuator 20 comprises a cylinder 18 having a piston 17 fitted thereon. An arm 16 projecting from the magnet support cylinder 14 through a slit in the left end wall of the guide cylinder 10 is connected to a rod projecting from the piston 17 to the outside. . The magnet support cylinder 14 has a magnet 14 of about half the area of the ferromagnetic plate 15
a are connected at equal intervals in the circumferential direction by an arrangement pitch which is の of the arrangement pitch of the ferromagnetic plates 15. As shown in FIG. 6, the magnet support cylinder 14 is made of a non-magnetic material such as aluminum, and a large number of magnets 14a are opposed to the ferromagnetic plate 15 and have different polarities to the ferromagnetic plate 15 by two in the circumferential direction. It is arranged in.
【０００５】図６に示すように、非制動時、共通の強磁
性板１５に対し、周方向に隣接する２つの磁石１４ａの
極性が互いに異なる状態では、強磁性板１５と磁石支持
筒１４との間に短絡的磁気回路ｙが生じ、制動ドラム７
に磁界を及ぼさない。As shown in FIG. 6, when the two magnets 14a adjacent to each other in the circumferential direction have different polarities with respect to the common ferromagnetic plate 15 during non-braking, the ferromagnetic plate 15 and the magnet support tube 14 A short-circuit magnetic circuit y is generated between the
No magnetic field.
【０００６】図７に示すように、制動時、流体圧アクチ
ユエータ２０により磁石支持筒１４を磁石１４ａの配列
ピツチｐだけ回動すると、共通の強磁性板１５に対し、
隣接する２つの磁石１４ａの極性が同じになる。したが
つて、２つの磁石１４ａが等しく強磁性板１５を経て制
動ドラム７に磁界を及ぼす。回転する制動ドラム７が磁
界を横切る時、制動ドラム７に渦電流が流れ、制動ドラ
ム７が制動トルクを受ける。この時、制動ドラム７と磁
石支持筒１４との間に磁気回路ｚが生じる。As shown in FIG. 7, when the magnet support cylinder 14 is turned by the fluid pressure actuator 20 by the arrangement pitch p of the magnets 14a during braking, the common ferromagnetic plate 15
The two adjacent magnets 14a have the same polarity. Accordingly, the two magnets 14 a equally apply a magnetic field to the brake drum 7 via the ferromagnetic plate 15. When the rotating brake drum 7 crosses the magnetic field, an eddy current flows through the brake drum 7, and the brake drum 7 receives a braking torque. At this time, a magnetic circuit z is generated between the braking drum 7 and the magnet support tube 14.
【０００７】上述したように、磁石支持筒１４の外周面
に多数の磁石１４ａを、強磁性板１５に対向する極性が
Ｎ，Ｎ，Ｓ，Ｓ，…というように、２つごとに異なるよ
うに結合し、２つの磁石１４ａの外面を覆うように強磁
性板１５（強磁性材かつ軟磁性材からなる）を案内筒１
０に配置し、流体圧アクチエータ２０により磁石１４ａ
の配列ピツチｐだけ磁石支持筒１４を正逆回動させて、
制動位置と非制動位置との切換えを行う従来の渦電流減
速装置では、強磁性板１５の断面形状、正確には案内筒
１０の中心軸線に対して垂直な断面の形状が、ほぼ長方
形をなしていたので、磁石支持筒１４の磁石１４ａから
制動ドラム７へ向う磁束の集中が得られず、制動力の低
下を招いていた。つまり、上述の渦電流減速装置では、
磁石１４ａの外面の面積よりも強磁性板１５の外面の面
積のほうが広く、強磁性板１５から出てくる磁束密度が
小さくなり、制動力の低下を招いていたのである。As described above, a large number of magnets 14a are provided on the outer peripheral surface of the magnet support tube 14 so that the polarities facing the ferromagnetic plate 15 are different for every two magnets such as N, N, S, S,. And a ferromagnetic plate 15 (made of a ferromagnetic material and a soft magnetic material) so as to cover the outer surfaces of the two magnets 14a.
0 and the magnet 14a
By rotating the magnet support cylinder 14 forward and backward by the arrangement pitch p,
In the conventional eddy current reduction device that switches between the braking position and the non-braking position, the cross-sectional shape of the ferromagnetic plate 15, that is, the cross-sectional shape perpendicular to the center axis of the guide tube 10 is substantially rectangular. Therefore, the concentration of the magnetic flux from the magnet 14a of the magnet support tube 14 to the braking drum 7 cannot be obtained, resulting in a decrease in the braking force. That is, in the eddy current reduction device described above,
The area of the outer surface of the ferromagnetic plate 15 was larger than the area of the outer surface of the magnet 14a, and the magnetic flux density coming out of the ferromagnetic plate 15 became smaller, resulting in a decrease in the braking force.
【０００８】[0008]
【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、強磁性板の回転軸に対する断面形状を台形
に似た形にし、磁束密度を高めて制動力を向上させる渦
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, an object of the present invention is to reduce the cross-sectional shape of a ferromagnetic plate with respect to the rotation axis to a trapezoidal shape, to increase the magnetic flux density and to improve the braking force, thereby reducing the eddy current. It is to provide a device.
【０００９】[0009]
【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、非磁性体からなりかつ断面長方形の内空部を有する
案内筒を配設し、該案内筒の外筒部に周方向等間隔に多
数の強磁性板を配設し、案内筒の内空部に回動可能に支
持した磁石支持筒の外面に、前記強磁性板に２つずつ対
向しかつ強磁性板に対する極性が周方向に２つずつ異な
るように磁石を配設した渦電流減速装置において、前記
強磁性板の周方向の寸法を内面から外面へ向かつて狭め
たことを特徴とする。In order to solve the above-mentioned problems, according to the present invention, a guide cylinder made of a non-magnetic material and having an inner space having a rectangular cross section is provided inside a brake drum connected to a rotating shaft. A large number of ferromagnetic plates are disposed at equal intervals in the circumferential direction on the outer cylinder portion of the guide cylinder, and the ferromagnetic plate is rotatably supported on the inner space of the guide cylinder. In an eddy current reduction device in which magnets are disposed so as to oppose two plates at a time and have different polarities to the ferromagnetic plate by two in the circumferential direction, the circumferential dimension of the ferromagnetic plate is changed from the inner surface to the outer surface. It is characterized by being narrowed.
【００１０】また、本発明の構成は回転軸に結合した制
動ドラムの内部に、非磁性体からなりかつ断面長方形の
内空部を有する案内筒を配設し、該案内筒の外筒部に周
方向等間隔に多数の強磁性板を配設し、案内筒の内部に
配設した磁性体からなる不動の磁石支持筒と可動の磁石
支持筒の各外面に、前記強磁性板に対向しかつ強磁性板
に対する極性が周方向に交互に異なるように磁石を結合
した渦電流減速装置において、前記強磁性板の周方向の
寸法を内面から外面へ向かつて次第に狭めたことを特徴
とする。Further, according to the structure of the present invention, a guide cylinder made of a non-magnetic material and having an inner space having a rectangular cross section is disposed inside a brake drum connected to a rotating shaft, and the guide cylinder is provided on an outer cylindrical portion of the guide cylinder. A number of ferromagnetic plates are arranged at equal intervals in the circumferential direction, and the outer surfaces of an immovable magnet support tube and a movable magnet support tube made of a magnetic material disposed inside the guide tube are opposed to the ferromagnetic plate. Further, in an eddy current reduction device in which magnets are coupled so that polarities with respect to a ferromagnetic plate are alternately different in a circumferential direction, a circumferential dimension of the ferromagnetic plate is gradually reduced from an inner surface to an outer surface.
【００１１】また、本発明の構成は回転軸に結合した制
動ドラムの内部に、非磁性体からなりかつ断面長方形の
内空部を有する案内筒を配設し、該案内筒の外筒部に周
方向等間隔に多数の強磁性板を配設し、案内筒の内部に
軸方向移動可能に配設した磁性体からなる磁石支持筒の
外面に、強磁性板に対する極性が周方向に交互に異なる
ように磁石を結合し、磁石支持筒を制動ドラムの内部へ
突出させて各磁石が各強磁性板に全面的に対向する制動
位置と、磁石支持筒を制動ドラムから引退させて各磁石
が各強磁性板に対向しない非制動位置とに切り換える渦
電流減速装置において、前記強磁性板の周方向の寸法を
内面から外面へ向かつて次第に狭めたことを特徴とす
る。Further, according to the structure of the present invention, a guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is disposed inside a brake drum connected to a rotating shaft, and an outer cylinder portion of the guide cylinder is provided on the outer cylinder portion of the guide cylinder. A large number of ferromagnetic plates are arranged at equal intervals in the circumferential direction, and the polarity with respect to the ferromagnetic plate is alternately arranged in the circumferential direction on the outer surface of a magnet support tube made of a magnetic material that is arranged movably in the axial direction inside the guide tube. The magnets are coupled differently, and the magnet support cylinder is protruded into the inside of the brake drum so that each magnet completely opposes each ferromagnetic plate. In an eddy current reduction device for switching to a non-braking position that does not face each ferromagnetic plate, the circumferential dimension of the ferromagnetic plate is gradually reduced from the inner surface to the outer surface.
【００１２】[0012]
【発明の実施の形態】強磁性板の周方向寸法を径外方へ
向かつて狭めて台形に似た形にし、磁束密度を高めて制
動力を向上させる。特に、強磁性板が２つの磁石と磁石
の間を覆う部分の肉厚を最大にする。これにより、強磁
性板の外面の面積が狭くなり、磁石から強磁性板を経て
制動ドラムへ向う磁束密度が高められる。BEST MODE FOR CARRYING OUT THE INVENTION The circumferential dimension of a ferromagnetic plate is narrowed outward and outward to resemble a trapezoid, and the magnetic flux density is increased to improve the braking force. In particular, the thickness of the portion where the ferromagnetic plate covers between the two magnets is maximized. As a result, the area of the outer surface of the ferromagnetic plate is reduced, and the magnetic flux density from the magnet to the brake drum via the ferromagnetic plate is increased.
【００１３】[0013]
【実施例】図１に示すように、本発明は強磁性板１５の
制動ドラム７に対する磁束密度を高めるために、強磁性
板１５の回転軸（制動ドラム７の中心軸線）に垂直な断
面形状を、内面２５から外面２４に向けて周方向寸法W2
が周方向寸法W1へと次第に小さくなるように、ほぼ台形
に構成したものである。したがつて、強磁性板１５の外
面２４は内面２５よりも狭くされる。制動ドラム７の矢
印ｘ方向の回転に関して、強磁性板１５の前方の側面は
側面２６，２７からなり、強磁性板１５の後方の側面は
側面２８，２９からなる。強磁性板１５の内面２５に隣
接する側面２７，２９は、強磁性板１５の体積を確保す
るために、制動ドラム７の回転中心から径外方へ延びる
線と平行にされる。前方の側面２６と後方の側面２８
は、２つの磁石１４ａの間を通る径方向線に関してほぼ
対称に傾斜される。上述の形状に予め成形された磁石１
４ａは、案内筒１０をアルミニウムから鋳造する際に、
鋳型へ配列されて鋳込まれる。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, according to the present invention, in order to increase the magnetic flux density of the ferromagnetic plate 15 with respect to the brake drum 7, a sectional shape perpendicular to the rotation axis of the ferromagnetic plate 15 (the center axis of the brake drum 7) is shown. From the inner surface 25 to the outer surface 24 in the circumferential direction W2
Has a substantially trapezoidal shape so that is gradually reduced to the circumferential dimension W1. Accordingly, the outer surface 24 of the ferromagnetic plate 15 is narrower than the inner surface 25. With respect to the rotation of the brake drum 7 in the direction of the arrow x, the front side surface of the ferromagnetic plate 15 is composed of the side surfaces 26 and 27, and the rear side surface of the ferromagnetic plate 15 is composed of the side surfaces 28 and 29. The side surfaces 27 and 29 adjacent to the inner surface 25 of the ferromagnetic plate 15 are made parallel to a line extending radially outward from the rotation center of the braking drum 7 to secure the volume of the ferromagnetic plate 15. Front side 26 and rear side 28
Are inclined substantially symmetrically with respect to a radial line passing between the two magnets 14a. Magnet 1 preformed into the above shape
4a, when casting the guide tube 10 from aluminum,
It is arranged and cast into a mold.
【００１４】図１に示す実施例では、案内筒１０の外筒
部１０ａの側面２６，２８と接する部分２１が鋭角にな
り、この部分２１から熱などの影響により破損する恐れ
がある。そこで、図２に示す実施例では、傾斜した側面
２６，２８の外面２４に隣接する部分を、案内筒１０の
外周面に対しほぼ垂直な側面２６ａ，２８ａに形成し、
外面２４にほぼ垂直な側面２６，２８と内面２５にほぼ
垂直な側面２７，２９との間に、内面２５から外面２４
へ向つて周方向寸法が次第に縮小するように傾斜した側
面２６，２８が形成される。これにより、案内筒１０の
外筒部１０ａと強磁性板１５との安定な結合が得られ
る。In the embodiment shown in FIG. 1, a portion 21 which contacts the side surfaces 26 and 28 of the outer tube portion 10a of the guide tube 10 has an acute angle, and there is a possibility that the portion 21 may be damaged by heat or the like. Therefore, in the embodiment shown in FIG. 2, the portions of the inclined side surfaces 26, 28 adjacent to the outer surface 24 are formed on the side surfaces 26a, 28a substantially perpendicular to the outer peripheral surface of the guide cylinder 10,
Between the inner surface 25 and the outer surface 24 between the side surfaces 26 and 28 substantially perpendicular to the outer surface 24 and the side surfaces 27 and 29 substantially perpendicular to the inner surface 25.
Side surfaces 26 and 28 are formed so that the circumferential dimension gradually decreases toward the bottom. Thereby, stable coupling between the outer cylinder portion 10a of the guide cylinder 10 and the ferromagnetic plate 15 is obtained.
【００１５】図３に示す実施例では、制動ドラム７が高
速回転する場合に、磁石１４ａから強磁性板１５を経て
制動ドラム７へ及ぶ磁束が、強磁性板１５の内部で矢印
ｘ方向（回転方向）へ引きずられる傾向があるので、強
磁性板１５の厚肉部分を矢印ｘ方向へ偏倚させたものて
ある。つまり、制動ドラム７の回転方向に関して前方の
側面２６を、内面２５から外面２４へ向けて、制動ドラ
ム７の回転方向に関して後方へ僅かに傾斜する単一の平
坦面に形成したものである。制動ドラム７の回転方向に
関して後方の側面は、図２の実施例と同様に、内面２５
に隣接する径方向の側面２９と外面２４に隣接する径方
向の側面２８ａとの間に、傾斜した側面２８が形成され
る。In the embodiment shown in FIG. 3, when the brake drum 7 rotates at a high speed, the magnetic flux reaching the brake drum 7 from the magnet 14a via the ferromagnetic plate 15 flows inside the ferromagnetic plate 15 in the direction of the arrow x (rotation). Direction), the thick portion of the ferromagnetic plate 15 is deflected in the direction of the arrow x. That is, the front side surface 26 with respect to the rotation direction of the braking drum 7 is formed as a single flat surface that is slightly inclined rearward with respect to the rotation direction of the braking drum 7 from the inner surface 25 to the outer surface 24. The rear side with respect to the rotation direction of the braking drum 7 has an inner surface 25 similar to the embodiment of FIG.
An inclined side surface 28 is formed between a radial side surface 29 adjacent to the outer surface 24 and a radial side surface 29a adjacent to the outer surface 24.
【００１６】図４に示す実施例は、制動ドラム７の高速
回転での磁束の流れ（引きづり）に対応して強磁性板１
５の内面２５に対して外面２４を矢印ｘ方向へ偏倚さ
せ、強磁性板１５の断面形状を平行四辺形に似たものに
したものである。もちろん、外面２４の面積は内面２５
の面積よりも狭くされる。回転方向前方の側面２６は内
面２５から外面２４へ向けて矢印ｘ方向へ傾けられた平
坦面とされる。一方、回転方向後方の側面は、内面２５
に隣接する径方向の側面２９と外面２４との間に、矢印
ｘ方向へ傾斜された側面２８を形成してなる。In the embodiment shown in FIG. 4, the ferromagnetic plate 1 corresponds to the flow of magnetic flux (dragging) when the brake drum 7 rotates at a high speed.
The outer surface 24 is displaced in the direction of the arrow x with respect to the inner surface 25 of the ferromagnetic plate 5 to make the cross-sectional shape of the ferromagnetic plate 15 similar to a parallelogram. Of course, the area of the outer surface 24 is
Is smaller than the area of The side surface 26 in the front in the rotation direction is a flat surface inclined in the direction of arrow x from the inner surface 25 to the outer surface 24. On the other hand, the side surface on the rear side in the rotation direction
A side surface 28 inclined in the direction of arrow x is formed between a radial side surface 29 and the outer surface 24 adjacent to the outer surface 24.
【００１７】本発明は図５〜７に示す渦電流減速装置に
限定されるものではなく、他の形式の渦電流減速装置に
も適用できる。図８に示す実施例では、回転軸１に結合
した制動ドラム７の内部に、非磁性体からなりかつ断面
長方形の内空部を有する案内筒１０を配設し、案内筒１
０の外筒部１０ａに周方向等間隔に多数の強磁性板１５
を配設し、案内筒１０の内部に配設した磁性体からなる
可動の磁石支持筒１４と不動の磁石支持筒３４の外面
に、各強磁性板１５に対向しかつ強磁性板１５に対する
極性が周方向に交互に異なるように磁石１４ａ，３４ａ
をそれぞれ結合し、同極性の磁石１４ａ，３４ａが各強
磁性板１５に全面的に対向する制動位置と、異極性の磁
石１４ａ，３４ａが各強磁性板１５に全面的に対向する
図示の非制動位置とに、可動の磁石支持筒１４をアクチ
ユエータ２０により正逆回動して切り換えられるもので
あり、図１〜４に示したように、強磁性板１５の周方向
の寸法は内面から外面へ向かつて次第に狭められる。The present invention is not limited to the eddy current reduction device shown in FIGS. 5 to 7, but can be applied to other types of eddy current reduction devices. In the embodiment shown in FIG. 8, a guide cylinder 10 made of a non-magnetic material and having an inner space with a rectangular cross section is disposed inside a braking drum 7 connected to the rotating shaft 1.
A large number of ferromagnetic plates 15 at equal intervals in the circumferential direction.
Are disposed on the outer surfaces of a movable magnet support tube 14 and a stationary magnet support tube 34 made of a magnetic material disposed inside the guide tube 10. Are alternately different in the circumferential direction.
And a braking position in which magnets 14a and 34a of the same polarity completely face each ferromagnetic plate 15, and a non-illustrated non-illustrated structure in which magnets 14a and 34a of different polarities entirely face each ferromagnetic plate 15. The movable magnet support cylinder 14 can be switched between the braking position and the forward / reverse rotation by the actuator 20 by the actuator 20. As shown in FIGS. 1 to 4, the circumferential dimension of the ferromagnetic plate 15 is changed from the inner surface to the outer surface. Once narrowed gradually toward.
【００１８】図９に示す実施例では、回転軸１に結合し
た制動ドラム７の内部に、非磁性体からなりかつ断面長
方形の内空部を有する案内筒１０を配設し、案内筒１０
の外筒部１０ａに周方向等間隔に多数の強磁性板１５を
配設し、案内筒１０の内部に軸方向移動可能に配設した
磁性体からなる磁石支持筒１４の外面に、各強磁性板１
５に対する極性が周方向に交互に異なるように磁石１４
ａを結合し、磁石支持筒１０を制動ドラム７の内部へ突
出させて各磁石１４ａが各強磁性板１５に全面的に対向
する図示の制動位置と、磁石支持筒１４を制動ドラム７
から軸方向に引退させて各磁石１４ａが各強磁性板１５
に対向しない非制動位置とにアクチユエータ２０により
切り換えられるものであり、図１〜４に示したように、
強磁性板１５の周方向の寸法は内面から外面へ向かつて
次第に狭められる。In the embodiment shown in FIG. 9, a guide cylinder 10 made of a non-magnetic material and having an inner space with a rectangular cross section is disposed inside a braking drum 7 connected to the rotating shaft 1.
A large number of ferromagnetic plates 15 are arranged at equal intervals in the circumferential direction on the outer cylinder portion 10a, and each of the ferromagnetic plates 15 is disposed inside the guide cylinder 10 so as to be axially movable. Magnetic plate 1
5 so that the polarities with respect to 5 are alternately different in the circumferential direction.
a, and the magnet support cylinder 10 is protruded into the inside of the brake drum 7 so that each magnet 14a is completely opposed to each ferromagnetic plate 15 in the illustrated braking position.
The magnets 14a are retracted in the axial direction from
Is switched by the actuator 20 to a non-braking position that is not opposed to the actuator. As shown in FIGS.
The circumferential dimension of the ferromagnetic plate 15 is gradually reduced from the inner surface to the outer surface.
【００１９】以上説明したように、本発明は強磁性板１
５の回転軸に垂直な断面の形状を、内面２５よりも外面
２４が狭くなつているほぼ台形にされているので、磁石
１４ａから強磁性板１５を経て制動ドラム７へ及ぼす磁
束が絞られる。つまり、２つの磁石１４ａの磁束が強磁
性板１５を透過する時に絞られて制動ドラム７ヘ及ぶの
で、制動ドラム７の内部で磁束密度が大きくなり、制動
ドラム７の内部に発生する渦電流が強くなり、制動力が
高められる。As described above, the present invention provides a ferromagnetic plate 1
Since the cross section perpendicular to the rotation axis of 5 is made substantially trapezoidal in which the outer surface 24 is narrower than the inner surface 25, the magnetic flux exerted on the braking drum 7 from the magnet 14a via the ferromagnetic plate 15 is reduced. In other words, the magnetic flux of the two magnets 14a is throttled when passing through the ferromagnetic plate 15 and reaches the brake drum 7, so that the magnetic flux density increases inside the brake drum 7, and the eddy current generated inside the brake drum 7 is reduced. It becomes stronger and the braking force is increased.
【００２０】[0020]
【発明の効果】要するに、本発明は回転軸に結合した制
動ドラムの内部に、非磁性体からなりかつ断面長方形の
内空部を有する案内筒を配設し、該案内筒の外筒部に周
方向等間隔に多数の強磁性板を配設し、案内筒の内空部
に回動可能または軸移動可能に支持した磁石支持筒の外
面に、前記強磁性板に対向する極性が周方向に１つまた
は２つずつ異なるように磁石を配設した渦電流減速装置
において、前記強磁性板の周方向の寸法を内面から外面
へ向かつて狭めたものであり、磁石からの磁束が強磁性
板を透過する時に絞られて制動ドラムヘ及ぶので、制動
ドラムの内部での磁束密度が大きくなり、制動力が向上
される。In short, according to the present invention, a guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is disposed inside a braking drum connected to a rotating shaft, and the guide cylinder is provided on an outer cylindrical portion of the guide cylinder. A large number of ferromagnetic plates are arranged at equal intervals in the circumferential direction, and the polarity opposite to the ferromagnetic plate is set in the circumferential direction on the outer surface of the magnet support tube supported rotatably or axially in the inner space of the guide tube. In the eddy current reduction device provided with magnets one or two different from each other, the circumferential dimension of the ferromagnetic plate is narrowed from the inner surface to the outer surface, and the magnetic flux from the magnet is Since it is squeezed when passing through the plate and reaches the brake drum, the magnetic flux density inside the brake drum increases, and the braking force is improved.
【図１】本発明の第１実施例に係る渦電流減速装置の要
部を示す正面断面図である。FIG. 1 is a front sectional view showing a main part of an eddy current reduction device according to a first embodiment of the present invention.
【図２】本発明の第２実施例に係る渦電流減速装置の要
部を示す正面断面図である。FIG. 2 is a front sectional view showing a main part of an eddy current reduction device according to a second embodiment of the present invention.
【図３】本発明の第３実施例に係る渦電流減速装置の要
部を示す正面断面図である。FIG. 3 is a front sectional view showing a main part of an eddy current reduction device according to a third embodiment of the present invention.
【図４】本発明の第４実施例に係る渦電流減速装置の要
部を示す正面断面図である。FIG. 4 is a front sectional view showing a main part of an eddy current reduction device according to a fourth embodiment of the present invention.
【図５】本発明が適用される渦電流減速装置の上半部を
示す側面断面図である。FIG. 5 is a side sectional view showing an upper half of the eddy current reduction device to which the present invention is applied.
【図６】同渦電流減速装置の非制動状態を示す正面断面
図である。FIG. 6 is a front sectional view showing the non-braking state of the eddy current reduction device.
【図７】同渦電流減速装置の制動状態を示す正面断面図
である。FIG. 7 is a front sectional view showing a braking state of the eddy current reduction device.
【図８】本発明が適用される他の渦電流減速装置の上半
部を示す側面断面図である。FIG. 8 is a side sectional view showing the upper half of another eddy current reduction device to which the present invention is applied.
【図９】本発明が適用される他の渦電流減速装置の上半
部を示す側面断面図である。FIG. 9 is a side sectional view showing the upper half of another eddy current reduction device to which the present invention is applied.
W1，W2：周方向寸法 １：回転軸 ６：スポーク ７：
制動ドラム ８：放熱フイン １０：案内筒 １０ａ：
外筒部 １０ｂ：内筒部 １４，３４：磁石支持筒 １
４ａ，３４ａ：磁石 １５：強磁性板 ２０：流体圧ア
クチユエータ ２４：外面 ２５：内面 ２６：側面
２７：側面 ２８：側面 ２９：側面W1, W2: Circumferential dimension 1: Rotary shaft 6: Spoke 7:
Brake drum 8: Heat radiation fin 10: Guide tube 10a:
Outer cylinder 10b: Inner cylinder 14, 34: Magnet support cylinder 1
4a, 34a: magnet 15: ferromagnetic plate 20: fluid pressure actuator 24: outer surface 25: inner surface 26: side surface
27: Side 28: Side 29: Side
Claims (3)
磁性体からなりかつ断面長方形の内空部を有する案内筒
を配設し、該案内筒の外筒部に周方向等間隔に多数の強
磁性板を配設し、前記案内筒の内空部に回動可能に支持
した磁性体からなる磁石支持筒の外面に、前記強磁性板
に２つずつ対向しかつ強磁性板に対する極性が周方向に
２つずつ異なるように磁石を結合した渦電流減速装置に
おいて、前記強磁性板の周方向の寸法を内面から外面へ
向かつて次第に狭め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 and having an inner space having a rectangular cross section is disposed inside a brake drum connected to a rotating shaft, and is arranged at equal intervals in a circumferential direction on an outer cylinder portion of the guide cylinder. A large number of ferromagnetic plates are provided, and two magnets are opposed to the ferromagnetic plate on the outer surface of a magnet support cylinder made of a magnetic material rotatably supported in the inner space of the guide cylinder. An eddy current reduction device in which magnets are coupled such that the polarities differ by two in the circumferential direction, wherein the circumferential dimension of the ferromagnetic plate is gradually reduced from the inner surface to the outer surface.
磁性体からなりかつ断面長方形の内空部を有する案内筒
を配設し、該案内筒の外筒部に周方向等間隔に多数の強
磁性板を配設し、案内筒の内部に配設した磁性体からな
る不動の磁石支持筒と可動の磁石支持筒の各外面に、前
記強磁性板に対向しかつ強磁性板に対する極性が周方向
に交互に異なるように磁石を結合した渦電流減速装置に
おいて、前記強磁性板の周方向の寸法を内面から外面へ
向かつて次第に狭めたことを特徴とする渦電流減速装
置。2. A guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is disposed inside a brake drum connected to a rotary shaft, and is arranged at equal intervals in a circumferential direction on an outer cylinder portion of the guide cylinder. A large number of ferromagnetic plates are provided, and on each outer surface of a stationary magnet support tube and a movable magnet support tube made of a magnetic material disposed inside the guide tube, the ferromagnetic plate is opposed to the ferromagnetic plate. An eddy current reduction device in which magnets are coupled so that polarities are alternately different in a circumferential direction, wherein a circumferential dimension of the ferromagnetic plate is gradually narrowed from an inner surface to an outer surface.
磁性体からなりかつ断面長方形の内空部を有する案内筒
を配設し、該案内筒の外筒部に周方向等間隔に多数の強
磁性板を配設し、案内筒の内部に軸方向移動可能に配設
した磁性体からなる磁石支持筒の外面に、強磁性板に対
する極性が周方向に交互に異なるように磁石を結合し、
磁石支持筒を制動ドラムの内部へ突出させて各磁石が各
強磁性板に全面的に対向する制動位置と、磁石支持筒を
制動ドラムから引退させて各磁石が各強磁性板に対向し
ない非制動位置とに切り換える渦電流減速装置におい
て、前記強磁性板の周方向の寸法を内面から外面へ向か
つて次第に狭めたことを特徴とする渦電流減速装置。渦
電流減速装置3. A guide cylinder made of a non-magnetic material and having an inner space having a rectangular cross section is disposed inside a brake drum connected to a rotating shaft, and is provided at equal intervals in a circumferential direction on an outer cylinder portion of the guide cylinder. A large number of ferromagnetic plates are provided, and magnets are provided on the outer surface of a magnet support tube made of a magnetic material disposed inside the guide tube so as to be movable in the axial direction such that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction. Combine
A braking position in which the magnet support cylinder protrudes into the inside of the braking drum so that each magnet entirely faces each ferromagnetic plate, and a braking position in which each magnet is retracted from the braking drum so that each magnet does not face each ferromagnetic plate. An eddy current reduction device for switching to a braking position, wherein a circumferential dimension of the ferromagnetic plate is gradually narrowed from an inner surface to an outer surface. Eddy current reducer
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26827298A JP3690471B2 (en) | 1998-09-22 | 1998-09-22 | Eddy current reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26827298A JP3690471B2 (en) | 1998-09-22 | 1998-09-22 | Eddy current reducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000102240A true JP2000102240A (en) | 2000-04-07 |
| JP3690471B2 JP3690471B2 (en) | 2005-08-31 |
Family
ID=17456267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26827298A Expired - Fee Related JP3690471B2 (en) | 1998-09-22 | 1998-09-22 | Eddy current reducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3690471B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6328142B1 (en) * | 1999-07-29 | 2001-12-11 | Isuzu Motors Limited | Eddy-current deceleration apparatus |
| JP2015061422A (en) * | 2013-09-19 | 2015-03-30 | 株式会社デンソー | Power transmission mechanism |
| JP2016533706A (en) * | 2014-09-03 | 2016-10-27 | インダストリー−アカデミック コーポレーション ファウンデイション， チョソン ユニバーシティーＩｎｄｕｓｔｒｙ−Ａｃａｄｅｍｉｃ Ｃｏｏｐｅｒａｔｉｏｎ Ｆｏｕｎｄａｔｉｏｎ， Ｃｈｏｓｕｎ Ｕｎｉｖｅｒｓｉｔｙ | Magnetic gear having a magnetic flux concentrating pole piece and a magnetic gear in which the pole piece is provided outside the rotor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645531B (en) * | 2020-06-16 | 2021-07-09 | 中车青岛四方车辆研究所有限公司 | Electromagnetic interference suppression method based on eddy current brake |
-
1998
- 1998-09-22 JP JP26827298A patent/JP3690471B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6328142B1 (en) * | 1999-07-29 | 2001-12-11 | Isuzu Motors Limited | Eddy-current deceleration apparatus |
| JP2015061422A (en) * | 2013-09-19 | 2015-03-30 | 株式会社デンソー | Power transmission mechanism |
| JP2016533706A (en) * | 2014-09-03 | 2016-10-27 | インダストリー−アカデミック コーポレーション ファウンデイション， チョソン ユニバーシティーＩｎｄｕｓｔｒｙ−Ａｃａｄｅｍｉｃ Ｃｏｏｐｅｒａｔｉｏｎ Ｆｏｕｎｄａｔｉｏｎ， Ｃｈｏｓｕｎ Ｕｎｉｖｅｒｓｉｔｙ | Magnetic gear having a magnetic flux concentrating pole piece and a magnetic gear in which the pole piece is provided outside the rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3690471B2 (en) | 2005-08-31 |
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