JPH10127039A - Permanent magnet eddy current speed reducer - Google Patents
Permanent magnet eddy current speed reducerInfo
- Publication number
- JPH10127039A JPH10127039A JP29335496A JP29335496A JPH10127039A JP H10127039 A JPH10127039 A JP H10127039A JP 29335496 A JP29335496 A JP 29335496A JP 29335496 A JP29335496 A JP 29335496A JP H10127039 A JPH10127039 A JP H10127039A
- Authority
- JP
- Japan
- Prior art keywords
- braking
- ferromagnetic
- eddy current
- permanent magnet
- magnet
- 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.)
- Pending
Links
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
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】本発明は主として大型車両の
摩擦ブレーキを補助する永久磁石式渦電流減速装置、特
に永久磁石の制動能力を高めるようにした永久磁石式渦
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 a permanent magnet type eddy current reduction device for assisting a friction brake of a large vehicle, and more particularly to a permanent magnet type eddy current reduction device for enhancing the braking capability of a permanent magnet.
【０００２】[0002]
【従来の技術】特開平1-298948号公報に開示される永久
磁石式渦電流減速装置では、回転軸に結合した制動ドラ
ムの内部に、アルミニウムなどからなる非磁性体の案内
筒が配設され、案内筒に多数の強磁性板（ポールピー
ス、以下同じ）が周方向等間隔に結合され、案内筒の内
部に回動可能に支持した磁石支持筒に、強磁性板とほぼ
同面積かつ同数の永久磁石（以下、これを単に磁石とい
う）が周方向等間隔かつ強磁性板ないし制動ドラムに対
する極性が交互に異なるよう結合される。2. Description of the Related Art In a permanent magnet type eddy current reduction device disclosed in Japanese Patent Application Laid-Open No. 1-298948, a nonmagnetic guide tube made of aluminum or the like is disposed inside a braking drum connected to a rotating shaft. A number of ferromagnetic plates (pole pieces, hereinafter the same) are connected to the guide cylinder at equal intervals in the circumferential direction, and the magnet support cylinder rotatably supported inside the guide cylinder has substantially the same area and the same number of ferromagnetic plates as the ferromagnetic plate. (Hereinafter simply referred to as magnets) are connected at equal intervals in the circumferential direction and alternately have different polarities with respect to the ferromagnetic plate or the braking drum.
【０００３】磁石式渦電流減速装置は制動ドラムに永久
磁石（以下、これを単に磁石という）との相対運動によ
り発生する渦電流と磁石からの磁界との相互作用により
制動力を発生する。そこで、鉄と銅の複合材からなる制
動ドラムを用いれば、鉄材単体のものに比べ制動トルク
は増加する。しかしながら、磁石を保護するために非磁
性体からなる案内筒の内部へ磁石支持筒を収容し、案内
筒の周壁部に強磁性板を配設した構造にすると、制動ト
ルクは強磁性板がないものよりも小さくなる。また、強
磁性板は磁石式渦電流減速装置の制動・非制動切換機構
に重要な部品であり、強磁性板をなくするには大幅な構
造変更が必要である。A magnet type eddy current reduction device generates a braking force by an interaction between an eddy current generated by a relative movement of a permanent magnet (hereinafter simply referred to as a magnet) on a braking drum and a magnetic field from the magnet. Therefore, when a braking drum made of a composite material of iron and copper is used, the braking torque is increased as compared with the case of a single iron material. However, if the magnet support cylinder is housed inside the guide cylinder made of a non-magnetic material to protect the magnet, and the ferromagnetic plate is arranged on the peripheral wall of the guide cylinder, the braking torque does not have the ferromagnetic plate. Smaller than the ones. Further, the ferromagnetic plate is an important part for the braking / non-braking switching mechanism of the magnet type eddy current reduction device, and a drastic structural change is required to eliminate the ferromagnetic plate.
【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、大幅な構造変更を加えないで、制動トルク
を高めるために、強磁性板の周方向の寸法を最適なもの
にした磁石式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 optimize the circumferential size of a ferromagnetic plate in order to increase braking torque without making a significant structural change. An object of the present invention is to provide a magnet type 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導体からなる制動
ドラムの内部に、非磁性体からなりかつ断面長方形の内
空部を有する不動の案内筒を同軸に配設し、前記案内筒
の制動ドラムと対向する外周壁部に周方向等間隔に多数
の強磁性板を結合し、前記案内筒の前記内空部に軸方向
移動可能に支持した磁石支持筒に、前記強磁性板に対す
る極性が周方向に交互に異なるよう永久磁石を結合し、
前記永久磁石が前記強磁性板と対向する制動位置と前記
永久磁石が前記強磁性板と対向しない非制動位置とに前
記磁石支持筒を軸方向に往復移動するアクチユエータを
備えてなる永久磁石式渦電流減速装置において、前記強
磁性板は制動ドラムに近づくにつれて周方向の寸法が短
くなるように、前記強磁性板の周方向端部の壁面が傾斜
されていることを特徴とするものである。According to the present invention, there is provided a brake drum comprising a conductor connected to a rotating shaft and having an inner space made of a non-magnetic material and having a rectangular cross section. An immovable guide cylinder is coaxially arranged, and a number of ferromagnetic plates are connected at equal circumferential intervals to an outer peripheral wall portion of the guide cylinder facing the braking drum, and axially moved to the inner space of the guide cylinder. A permanent magnet is coupled to the magnet support cylinder that is supported so that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction.
A permanent magnet type vortex comprising an actuator that reciprocates the magnet support cylinder in the axial direction between a braking position where the permanent magnet faces the ferromagnetic plate and a non-braking position where the permanent magnet does not face the ferromagnetic plate. The current reduction device is characterized in that the ferromagnetic plate has a circumferentially inclined wall surface at an end in the circumferential direction such that the circumferential dimension of the ferromagnetic plate becomes shorter as approaching the braking drum.
【０００６】また、本発明の構成は回転軸に結合した導
体からなる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不動の案内筒を同軸に配設
し、前記案内筒の外周壁部に周方向等間隔に多数の強磁
性板を結合し、前記案内筒の前記内空部に回動可能の磁
石支持筒と回動不能の磁石支持筒とを軸方向に並べて支
持し、前記各磁石支持筒に強磁性板に対する極性が周方
向に交互に異なるよう永久磁石を結合し、前記各強磁性
板に対向する前記各磁石支持筒の永久磁石の極性が同じ
である制動位置と前記各強磁性板に対向する前記各磁石
支持筒の永久磁石の極性が異なる非制動位置とに一方の
磁石支持筒を正逆回動するアクチユエータを備えてなる
永久磁石式渦電流減速装置において、前記強磁性板は制
動ドラムに近づくにつれて周方向の寸法が短くなるよう
に、前記強磁性板の周方向端部の壁面が傾斜されている
ことを特徴とするものである。。Further, according to the structure of the present invention, an immovable guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is coaxially arranged inside a braking drum made of a conductor connected to a rotating shaft. A large number of ferromagnetic plates are joined to the outer peripheral wall of the guide cylinder at equal intervals in the circumferential direction, and a rotatable magnet support cylinder and a non-rotatable magnet support cylinder are axially arranged in the inner space of the guide cylinder. The magnets are supported side by side, and permanent magnets are coupled to the respective magnet support cylinders so that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction. The permanent magnets of the respective magnet support cylinders facing the respective ferromagnetic plates have the same polarity. A permanent magnet type eddy current including an actuator for rotating one of the magnet support cylinders forward and reverse at a certain braking position and a non-brake position at which the permanent magnets of the magnet support cylinders facing the ferromagnetic plates have different polarities. In a reduction gear, the ferromagnetic plate approaches a braking drum As brought by circumferential dimension is shortened, the wall surface of the circumferential end portion of the ferromagnetic plate is characterized in that it is tilted. .
【０００７】さらに、本発明の構成は回転軸に結合した
導体からなる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不動の案内筒を同軸に配
設し、前記案内筒の外周壁部に周方向等間隔に多数の強
磁性板を配設し、前記案内筒の前記内空部に回動可能に
支持した磁石支持筒に、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２つずつ周方向に交互に異
なるよう永久磁石を結合し、前記各強磁性板に対向する
２つの永久磁石の極性が同じである制動位置と前記各強
磁性板に対向する２つの永久磁石の極性が異なる非制動
位置とに前記磁石支持筒を回動するアクチユエータを備
えてなる永久磁石式渦電流減速装置において、前記強磁
性板は制動ドラムに近づくにつれて周方向の寸法が短く
なるように、強磁性板の周方向端面が傾斜されているこ
とを特徴とするものである。Further, according to the structure of the present invention, an immovable guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is coaxially arranged inside a braking drum made of a conductor connected to a rotating shaft. A number of ferromagnetic plates are arranged at equal intervals in the circumferential direction on the outer peripheral wall of the guide cylinder, and two magnet plates are provided on the magnet support cylinder rotatably supported by the inner space of the guide cylinder. Permanent magnets are coupled to each other so as to have opposite polarities alternately in the circumferential direction by two for the ferromagnetic plate, and a braking position in which the two permanent magnets facing each of the ferromagnetic plates have the same polarity and each of the ferromagnetic In a permanent magnet type eddy current reduction device comprising an actuator for rotating the magnet support cylinder at a non-braking position where the polarities of two permanent magnets opposite to the plate are different, the ferromagnetic plate rotates around as it approaches the braking drum. Strong magnetic so that the dimension in the It is characterized in that the circumferential end face of the plate is inclined.
【０００８】[0008]
【発明の実施の形態】渦電流減速装置は制動ドラムに磁
石との相対運動により発生する渦電流と、磁石からの磁
界との相互作用により制動力を発生するので、渦電流と
磁界が大きいほど制動トルクは大きくなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current reduction device generates a braking force by the interaction of an eddy current generated by relative movement of a brake drum with a magnet and a magnetic field from the magnet. The braking torque increases.
【０００９】本発明では、磁石を保護しかつ磁石と一体
的に働く強磁性板の制動ドラムに対向する面積を磁石に
対向する面積よりも狭くし、制動ドラムに作用する磁束
を集中させることにより磁束密度の低下を抑える。具体
的には、強磁性板の周方向の寸法を制動ドラムに近づく
につれて短くする。この時、強磁性板の周方向の寸法が
短すぎると磁束が飽和してしまうので最適な寸法が存在
する。実験した結果によれば、強磁性板の周方向端部の
傾斜角が１５°の時に最大になる。According to the present invention, the area of the ferromagnetic plate which protects the magnet and works integrally with the magnet, which faces the braking drum, is made smaller than the area which faces the magnet, and the magnetic flux acting on the braking drum is concentrated. Suppress the decrease in magnetic flux density. Specifically, the circumferential dimension of the ferromagnetic plate is shortened as approaching the braking drum. At this time, if the circumferential dimension of the ferromagnetic plate is too short, the magnetic flux will be saturated, so there is an optimal dimension. According to the experimental results, the maximum value is obtained when the inclination angle of the circumferential end of the ferromagnetic plate is 15 °.
【００１０】[0010]
【実施例】図１は本発明が適用される磁石式渦電流減速
装置の正面断面図、図２は同側面断面図である。本発明
による磁石式渦電流減速装置は、制動ドラム１３を回転
軸４に結合される。このため、変速機の歯車箱２の端壁
に軸受３により支持されかつ端壁から突出する出力回転
軸４に、スプライン孔５ａを有する取付フランジ５が嵌
合され、かつ抜け出ないようにナツト６により締結され
る。取付フランジ５に駐車ブレーキの制動ドラム７の端
壁と、渦電流減速装置の制動ドラム１３のボス部９と一
体のフランジ部９ａとが重ね合され、複数のボルト１０
とナツト１０ａにより締結される。1 is a front sectional view of a magnet type eddy current reduction device to which the present invention is applied, and FIG. 2 is a side sectional view of the same. In the magnetic eddy current reduction device according to the present invention, the braking drum 13 is connected to the rotating shaft 4. For this reason, the mounting flange 5 having the spline hole 5a is fitted to the output rotary shaft 4 which is supported by the bearing 3 on the end wall of the gear box 2 of the transmission and protrudes from the end wall, and the nut 6 does not come off. Is concluded. The end wall of the brake drum 7 of the parking brake and the flange portion 9a integral with the boss 9 of the brake drum 13 of the eddy current reduction device are superimposed on the mounting flange 5, and a plurality of bolts 10
And the nut 10a.
【００１１】制動ドラム１３は例えばアルミニウムから
なり、好ましくは、内周面１３ｃに、薄い銅板を筒形に
成形してなる銅製筒体３５を結合される。制動ドラム１
３は基端部を、ボス部９から放射方向へ延びる多数のス
ポーク１２に結合される。制動ドラム１３の外周壁に周
方向等間隔に、多数の冷却フイン１３ａが一体に備えら
れる。The braking drum 13 is made of, for example, aluminum. Preferably, a copper cylinder 35 formed by molding a thin copper plate into a cylinder is connected to the inner peripheral surface 13c. Brake drum 1
3 has its proximal end connected to a number of spokes 12 extending radially from the boss 9. A large number of cooling fins 13a are integrally provided on the outer peripheral wall of the braking drum 13 at equal intervals in the circumferential direction.
【００１２】制動ドラム１３の内部に、断面箱形の内空
部を有する案内筒１８が同軸に配設される。不動の案内
筒１８は歯車箱２の突壁２ａに外嵌固定した枠板３１
に、ボルト３２，３３により固定される。案内筒１８は
外周壁部１８ａと内周壁部１８ｂとの両端に環状の端壁
板を結合して構成してもよいが、図示の案内筒１８は普
通の鉄などからなる左半部の断面コ字形をなす筒部分
と、アルミニウムなどの非磁性体からなる右半部の断面
逆Ｌ字形をなす筒部分とを、多数のボルト１４により結
合して構成される。A guide cylinder 18 having a box-shaped inner space is coaxially arranged inside the braking drum 13. The stationary guide cylinder 18 is a frame plate 31 that is externally fitted and fixed to the protruding wall 2a of the gear box 2.
Are fixed by bolts 32 and 33. The guide tube 18 may be formed by connecting an annular end wall plate to both ends of an outer peripheral wall portion 18a and an inner peripheral wall portion 18b, but the illustrated guide tube 18 is a cross section of a left half portion made of ordinary iron or the like. A cylindrical portion having a U-shape and a cylindrical portion having an inverted L-shaped cross section of a right half portion made of a nonmagnetic material such as aluminum are connected by a number of bolts 14.
【００１３】制動ドラム１３の内周面１３ｃ（図２）と
対向する案内筒１８の外周壁部１８ａに、周方向等間隔
に多数の開口が設けられ、各開口に強磁性板（ポールピ
ース）２１が嵌合固定される。実際には、強磁性板２１
は外周壁部１８ａをアルミニウムから鋳造する際に鋳ぐ
るまれる。A large number of openings are provided in the outer peripheral wall portion 18a of the guide cylinder 18 facing the inner peripheral surface 13c (FIG. 2) of the braking drum 13 at equal intervals in the circumferential direction, and each opening has a ferromagnetic plate (pole piece). 21 is fitted and fixed. In practice, the ferromagnetic plate 21
Is cast when the outer peripheral wall 18a is cast from aluminum.
【００１４】補強リブ３１ａを有する枠板３１に、周方
向等間隔に複数のアクチユエータ（図示せず）が支持さ
れる。アクチユエータはシリンダにピストンを嵌合して
１対の流体圧室を区画し、ピストンから案内筒１８の内
空部へ突出するロツド１７の端部に磁石支持筒１９を結
合される。磁石支持筒１９は案内筒１８の内空部に軸方
向移動可能に支持される。磁石支持筒１９の外周壁に、
各強磁性板２１と対向する磁石２０が、極性が周方向に
交互に異なるように結合される。A plurality of actuators (not shown) are supported on the frame plate 31 having the reinforcing ribs 31a at equal intervals in the circumferential direction. The actuator has a piston fitted into the cylinder to define a pair of fluid pressure chambers, and a magnet support cylinder 19 is connected to an end of a rod 17 projecting from the piston into the inner space of the guide cylinder 18. The magnet support cylinder 19 is supported by the inner space of the guide cylinder 18 so as to be movable in the axial direction. On the outer peripheral wall of the magnet support cylinder 19,
The magnets 20 facing each ferromagnetic plate 21 are coupled such that the polarities are alternately different in the circumferential direction.
【００１５】制動時、磁石支持筒１９は図１に示すよう
に、アクチユエータのロツド１７により制動ドラム１３
の内部へ突出される。回転する制動ドラム１３が磁石２
０から強磁性板２１を経て制動ドラム１３の内周面１３
ｃへ及ぶ磁界を横切る時、制動ドラム１３に渦電流が発
生し、制動ドラム１３が制動トルクを発生する。制動ド
ラム１３は渦電流により発熱し、直接または冷却フイン
１３ａを介して外気により冷却される。制動時、図２に
示すように、磁石支持筒１９と制動ドラム１３との間に
磁気回路４０が形成される。At the time of braking, as shown in FIG. 1, the magnet supporting cylinder 19 is moved by the rod 17 of the actuator to the braking drum 13 as shown in FIG.
Is protruded into the inside of. The rotating braking drum 13 is a magnet 2
0 to the inner peripheral surface 13 of the braking drum 13 through the ferromagnetic plate 21
When crossing the magnetic field reaching c, an eddy current is generated in the braking drum 13, and the braking drum 13 generates a braking torque. The braking drum 13 generates heat due to the eddy current, and is cooled by the outside air directly or via the cooling fin 13a. At the time of braking, a magnetic circuit 40 is formed between the magnet support cylinder 19 and the braking drum 13 as shown in FIG.
【００１６】非制動時、アクチユエータにより磁石支持
筒１９を図１の左方へ移動し、制動ドラム１３から引退
させれば、磁石２０は制動ドラム１３へ磁界を及ぼさな
くなり、制動ドラム１３は制動トルクを発生しない。When the brake is not applied, the magnet support cylinder 19 is moved to the left in FIG. 1 by the actuator, and is withdrawn from the brake drum 13, so that the magnet 20 does not exert a magnetic field on the brake drum 13 and the brake drum 13 applies the braking torque. Does not occur.
【００１７】ところで、渦電流減速装置は制動ドラム１
３に磁石２０との相対運動により発生する渦電流と、磁
石２０からの磁界との相互作用により制動力を発生する
ので、渦電流と磁界が強いほど制動トルクは大きくな
る。このため、上述の実施例では、制動ドラム１３は透
磁率が高い鉄製のものとして磁束密度を大きくし、かつ
渦電流の発生部位となる制動ドラム１３の内周壁部に、
導電率の高い銅製筒体３５を結合して渦電流を増加させ
ている。しかし、磁石２０を保護するために非磁性体か
らなる案内筒１８の内部へ磁石支持筒１９を収容し、案
内筒１８の外周壁部１８ａに強磁性板２１を配設する
と、磁石２０が強磁性板２１を経て制動ドラム１３へ及
ぼす磁束密度は、強磁性板２１がないものに比べて大幅
に低下し、制動トルクが小さくなる。The eddy current reduction device is a braking drum 1
3, a braking force is generated by the interaction between the eddy current generated by the relative motion with the magnet 20 and the magnetic field from the magnet 20, so that the stronger the eddy current and the magnetic field, the larger the braking torque. For this reason, in the above-described embodiment, the braking drum 13 is made of iron having a high magnetic permeability so that the magnetic flux density is increased, and the inner peripheral wall of the braking drum 13 serving as an eddy current generation site is provided with:
The eddy current is increased by coupling the copper cylinder 35 having high conductivity. However, if the magnet support tube 19 is housed inside the guide tube 18 made of a non-magnetic material to protect the magnet 20, and the ferromagnetic plate 21 is provided on the outer peripheral wall 18a of the guide tube 18, the magnet 20 becomes strong. The magnetic flux density exerted on the braking drum 13 via the magnetic plate 21 is greatly reduced as compared with the case without the ferromagnetic plate 21, and the braking torque is reduced.
【００１８】そこで、図３，４に示すように、本発明で
は強磁性板２１の形状について、制動ドラム１３に近づ
くにつれて周方向の寸法が短くなるように、強磁性板２
１の周方向端部の壁面２１ａを傾斜させてある。これに
より、磁石２０から制動ドラム１３への磁束が集中し、
磁束密度の低下が抑えられる。しかし、強磁性板２１の
周方向端部の壁面２１ａの傾斜角が小さすぎると（強磁
性板２１の外面の周方向の寸法が短すぎると）、磁束が
飽和してしまう。Therefore, as shown in FIGS. 3 and 4, in the present invention, the shape of the ferromagnetic plate 21 is set so that the dimension in the circumferential direction decreases as the position approaches the braking drum 13.
The wall surface 21a at the end in the circumferential direction is inclined. Thereby, the magnetic flux from the magnet 20 to the braking drum 13 concentrates,
A decrease in magnetic flux density can be suppressed. However, if the inclination angle of the wall surface 21a at the circumferential end of the ferromagnetic plate 21 is too small (the circumferential dimension of the outer surface of the ferromagnetic plate 21 is too short), the magnetic flux is saturated.
【００１９】図５〜７に示すように、強磁性板２１の周
方向端部の壁面２１ａの傾斜角を０°，１５°，４５°
にした場合について検討したところ、図８に示すよう
に、強磁性板２１の形状により制動トルクが変化するす
ることが分つた。制動ドラム１３の回転数が３０００r.
p.m.の時の制動トルクは、図９に示すとおりであり、強
磁性板２１の周方向端部の壁面２１ａの傾斜角が１５°
の時に最大になり、強磁性板２１の周方向端部の壁面２
１ａに傾斜角を設けない場合（９０°の場合）に比べ
て、約５〜８％の制動トルクの増加が見られた。As shown in FIGS. 5 to 7, the inclination angles of the wall surface 21a at the circumferential end of the ferromagnetic plate 21 are 0 °, 15 °, 45 °.
As a result of studying the case described above, it was found that the braking torque varies depending on the shape of the ferromagnetic plate 21, as shown in FIG. When the rotation speed of the braking drum 13 is 3000 r.
The braking torque at the time of pm is as shown in FIG. 9, and the inclination angle of the wall surface 21a at the circumferential end of the ferromagnetic plate 21 is 15 °.
And the wall 2 at the circumferential end of the ferromagnetic plate 21
An increase in braking torque of about 5 to 8% was observed as compared with the case where the inclination angle was not provided in 1a (in the case of 90 °).
【００２０】以上の実施例は、制動ドラム１３に対し磁
石支持筒１９を軸方向に往復移動させて、磁石２０が強
磁性板２１と対向する制動位置と、磁石２０が強磁性板
２１と対向しない非制動位置とに切り換える形式の磁石
式渦電流減速装置の場合について説明したが、本発明は
これに限定されるものではなく、図１０，１１に示すよ
うな制動ドラム１３の内部に不動の磁石支持筒１９Ａと
可動の磁石支持筒１９Ｂを配設し、一方の磁石支持筒１
９Ｂを回動させて、両方の磁石支持筒１９Ａ，１９Ｂの
極性が同じ１対の磁石２０が共通の強磁性板２１と全面
的に対向する制動位置と、両方の磁石支持筒１９Ａ，１
９Ｂの極性が異なる１対の磁石２０が共通の強磁性板２
１と全面的に対向する非制動位置とに切り換える形式の
磁石式渦電流減速装置や、図１２，１３に示すような制
動ドラム１３に対し１つの磁石支持筒１９を回動させ
て、磁石２０が強磁性板２１と全面的に対向する制動位
置と、極性が異なる１対の磁石２０が共通の強磁性板２
１に全面的に対向する非制動位置とに切り換える形式の
磁石式渦電流減速装置にも適用できる。In the embodiment described above, the magnet support cylinder 19 is reciprocated in the axial direction with respect to the braking drum 13 so that the braking position where the magnet 20 faces the ferromagnetic plate 21 and the magnet 20 faces the ferromagnetic plate 21 Although the description has been given of the case of the magnet type eddy current reduction device of the type switching to the non-braking position, which is not performed, the present invention is not limited to this, and the immovable inside of the braking drum 13 as shown in FIGS. A magnet support tube 19A and a movable magnet support tube 19B are provided, and one magnet support tube 1 is provided.
9B, a pair of magnets 20 having the same polarity of the two magnet support cylinders 19A and 19B are completely opposed to the common ferromagnetic plate 21 at the braking position, and both magnet support cylinders 19A and 19B are rotated.
A pair of magnets 20 having different polarities 9B share a common ferromagnetic plate 2
12, a magnet type eddy current reduction device of a type that switches to a non-braking position, and a magnet supporting cylinder 19 is rotated with respect to a braking drum 13 as shown in FIGS. And a pair of magnets 20 having different polarities share the same ferromagnetic plate 2.
The present invention can also be applied to a magnet type eddy current reduction device of a type that switches to a non-braking position that is entirely opposed to 1.
【００２１】図１０，１１は制動ドラム１３の内部に不
動の磁石支持筒１９Ａと可動の磁石支持筒１９Ｂを配設
し、一方の磁石支持筒１９Ｂを回動させて制動位置と非
制動位置とに切り換える形式の磁石式渦電流減速装置を
示す。磁石式渦電流減速装置は回転軸に結合される導体
からなる制動ドラム１３と、制動ドラム１３の内部に配
設される非磁性体からなる案内筒１８と、案内筒１８の
内空部に支持した不動の磁石支持筒１９Ａと可動の磁石
支持筒１９Ｂとを備えている。10 and 11, a stationary magnet support tube 19A and a movable magnet support tube 19B are disposed inside the brake drum 13, and one of the magnet support tubes 19B is rotated to switch between the braking position and the non-braking position. Fig. 1 shows a magnetic eddy current reduction device of the type that switches to (1). The magnet type eddy current reduction device includes a brake drum 13 made of a conductor coupled to a rotating shaft, a guide tube 18 made of a non-magnetic material disposed inside the brake drum 13, and supported by an inner space of the guide tube 18. And a movable magnet support cylinder 19B.
【００２２】不動の磁石支持筒１９Ａはピンなどにより
案内筒１８に固定される。可動の磁石支持筒１９Ｂは軸
受４６，４７により、磁石支持筒１９Ａと案内筒１８の
内周壁部１８ｂの間に支持される。制動ドラム７はボス
９を回転軸に結合され、ボス５から放射状に延びるスポ
ーク１２に、冷却フイン１３ａを備えた制動ドラム１３
が結合される。案内筒１８の外周壁部１８ａに多数の強
磁性板２１が周方向等間隔に結合される。好ましくは、
強磁性板２１は案内筒１８の成形時鋳ぐるまれる。The stationary magnet support cylinder 19A is fixed to the guide cylinder 18 by pins or the like. The movable magnet support cylinder 19B is supported between the magnet support cylinder 19A and the inner peripheral wall 18b of the guide cylinder 18 by bearings 46 and 47. The braking drum 7 has a boss 9 connected to a rotating shaft, and a spoke 12 extending radially from the boss 5 and a braking drum 13 provided with a cooling fin 13a.
Are combined. A large number of ferromagnetic plates 21 are coupled to the outer peripheral wall 18a of the guide cylinder 18 at equal intervals in the circumferential direction. Preferably,
The ferromagnetic plate 21 is cast when the guide cylinder 18 is formed.
【００２３】磁石支持筒１８を磁石２０の配列間隔分だ
け回動することにより、両方の磁石支持筒１９Ａ，１９
Ｂの極性が異なる１対の磁石２０Ａ，２０Ｂが共通の強
磁性板２１と全面的に対向し、強磁性板２１と磁石支持
筒１８の間に短絡的磁気回路を形成する非制動位置と、
両方の磁石支持筒１９Ａ，１９Ｂの極性が同じ磁石２０
Ａ，２０Ｂが共通の強磁性板２１と全面的に対向し、制
動ドラム１３と磁石支持筒１８の間に磁気回路を形成す
る制動位置とに切り換わる。By rotating the magnet support cylinder 18 by the arrangement interval of the magnets 20, both magnet support cylinders 19A, 19
A pair of magnets 20A and 20B having different polarities of B entirely facing the common ferromagnetic plate 21 and forming a short-circuit magnetic circuit between the ferromagnetic plate 21 and the magnet support cylinder 18;
The magnet 20 having the same polarity of both magnet support cylinders 19A and 19B
A and 20B entirely oppose the common ferromagnetic plate 21 and switch to a braking position where a magnetic circuit is formed between the braking drum 13 and the magnet support cylinder 18.
【００２４】図１２，１３は制動ドラム１３に対し１つ
の磁石支持筒１９を回動させて、磁石２０が強磁性板２
１と全面的に対向する制動位置と、極性が異なる１対の
磁石２０が共通の強磁性板２１に全面的に対向する非制
動位置とに切り換える形式の磁石式渦電流減速装置を示
す。磁石支持筒１９は案内筒１８の内空部、詳しくは内
筒部１８ｂに軸受４７により回動可能に支持される。案
内筒１８の左端壁に、好ましくは３つの流体圧アクチユ
エータ４１が周方向等間隔に結合される。流体圧アクチ
ユエータ４１はシリンダ４２にピストン４３を嵌装して
なり、ピストン４３から外部へ突出するロツドに、磁石
支持筒１９から案内筒１８の左端壁のスリツトを経て突
出する腕１７が連結される。磁石支持筒１９に強磁性板
２１の約半分の面積で倍数の磁石２０が、強磁性板２１
の配列間隔の半分の間隔で周方向に配設される。図１３
に示すように、磁性体からなる磁石支持筒１９に、２つ
の磁石２０が各強磁性板２１と対向しかつ強磁性板２１
に対する極性が周方向に２つずつ異なるように結合され
る。FIGS. 12 and 13 show that one magnet support cylinder 19 is rotated with respect to the braking drum 13 so that the magnet 20
1 shows a magnet type eddy current reduction device of a type that switches between a braking position entirely opposed to the first and a non-braking position where a pair of magnets 20 having different polarities entirely face a common ferromagnetic plate 21. The magnet support tube 19 is rotatably supported by a bearing 47 in an inner space portion of the guide tube 18, specifically, the inner tube portion 18 b. Preferably, three fluid pressure actuators 41 are connected to the left end wall of the guide tube 18 at equal circumferential intervals. The fluid pressure actuator 41 has a piston 43 fitted on a cylinder 42, and an arm 17 projecting from the magnet support cylinder 19 through a slit on the left end wall of the guide cylinder 18 is connected to a rod projecting outward from the piston 43. . The magnet support cylinder 19 is provided with a magnet 20 having an area approximately half the area of the ferromagnetic plate 21 and a multiple number thereof.
Are arranged in the circumferential direction at an interval of a half of the arrangement interval. FIG.
As shown in FIG. 3, two magnets 20 face each ferromagnetic plate 21 and are mounted on a magnet support cylinder 19 made of a magnetic material.
Are connected in such a way that the polarities of the two are different from each other in the circumferential direction.
【００２５】非制動時、共通の強磁性板２１に対し、周
方向に隣接する２つの磁石２０の極性が互いに異なる位
置では、強磁性板２１と磁石支持筒１８との間で短絡的
磁気回路が生じ、制動ドラム１３に磁界を及ぼさない。At the time of non-braking, a short-circuited magnetic circuit between the ferromagnetic plate 21 and the magnet support cylinder 18 at a position where the two magnets 20 adjacent in the circumferential direction have different polarities with respect to the common ferromagnetic plate 21. Occurs, and does not exert a magnetic field on the braking drum 13.
【００２６】制動時、流体圧アクチユエータ４１にり磁
石支持筒１８を磁石２０の配列間隔ｐ分だけ回動する
と、図１３に示すように、共通の強磁性板２１に対し、
隣接する２つの磁石２０の極性が同じになる。したがつ
て、２つの磁石２０が等しく強磁性板２１を経て制動ド
ラム１３に磁界を及ぼす。回転する制動ドラム１３が磁
界を横切る時、制動ドラム１３に渦電流が流れ、制動ド
ラム１３が制動トルクを受ける。この時、磁石２０から
強磁性板２１、制動ドラム１３、隣りの強磁性板２１、
隣りの磁石２０、磁石支持筒１８へと磁気回路が生じ
る。At the time of braking, when the magnet supporting cylinder 18 is rotated by the fluid pressure actuator 41 by the arrangement interval p of the magnets 20, as shown in FIG.
The two adjacent magnets 20 have the same polarity. Thus, the two magnets 20 equally exert a magnetic field on the braking drum 13 via the ferromagnetic plate 21. When the rotating brake drum 13 crosses the magnetic field, an eddy current flows through the brake drum 13 and the brake drum 13 receives a braking torque. At this time, the magnet 20, the ferromagnetic plate 21, the braking drum 13, the adjacent ferromagnetic plate 21,
A magnetic circuit is generated between the adjacent magnet 20 and the magnet support cylinder 18.
【００２７】[0027]
【発明の効果】本発明は上述のように、磁石式渦電流減
速装置の強磁性板について、制動ドラムに近づくにつれ
て周方向の寸法が短くなるように、強磁性板の周方向端
部の壁面を傾斜させたものであるから、磁石を保護しか
つ磁石と一体的に働く強磁性板の制動ドラムに対向する
面積が磁石に対向する面積よりも狭くなり、制動ドラム
に作用する磁束が集中される。したがつて、従来の磁石
式渦電流減速装置に大幅な構造変更を加えないで、制動
トルクを高めることができる。As described above, according to the present invention, the ferromagnetic plate of the magnet type eddy current reduction device has a wall surface at the circumferential end portion of the ferromagnetic plate so that the circumferential dimension becomes shorter as approaching the braking drum. The area of the ferromagnetic plate that protects the magnet and that works integrally with the magnet is smaller than the area that faces the brake drum, and the magnetic flux that acts on the brake drum is concentrated. You. Therefore, the braking torque can be increased without making a significant structural change to the conventional magnet type eddy current reduction device.
【図１】本発明が適用される磁石式渦電流減速装置の正
面断面図である。FIG. 1 is a front sectional view of a magnet type eddy current reduction device to which the present invention is applied.
【図２】同磁石式渦電流減速装置の側面断面図である。FIG. 2 is a side sectional view of the magnet type eddy current reduction device.
【図３】本発明に係る渦電流減速装置の側面断面図であ
る。FIG. 3 is a side sectional view of the eddy current reduction device according to the present invention.
【図４】同渦電流減速装置の正面断面図である。FIG. 4 is a front sectional view of the eddy current reduction device.
【図５】同案内筒の正面断面図である。FIG. 5 is a front sectional view of the guide tube.
【図６】同案内筒の正面断面図である。FIG. 6 is a front sectional view of the guide tube.
【図７】同案内筒の正面断面図である。FIG. 7 is a front sectional view of the guide tube.
【図８】強磁性板の形状と制動トルクの関係を表す線図
である。FIG. 8 is a diagram showing a relationship between a shape of a ferromagnetic plate and a braking torque.
【図９】強磁性板の周方向端部の壁面の傾斜角と制動ト
ルクの関係を表す線図である。FIG. 9 is a diagram illustrating a relationship between an inclination angle of a wall surface at a circumferential end portion of the ferromagnetic plate and a braking torque.
【図１０】本発明が適用される他形式の磁石式渦電流減
速装置の正面断面図である。FIG. 10 is a front sectional view of another type of magnet type eddy current reduction device to which the present invention is applied.
【図１１】同渦電流減速装置の磁石と強磁性板との関係
を表す展開平面図である。FIG. 11 is a developed plan view showing a relationship between a magnet and a ferromagnetic plate of the eddy current reduction device.
【図１２】本発明が適用される他形式の磁石式渦電流減
速装置の正面断面図である。FIG. 12 is a front sectional view of another type of magnet type eddy current reduction device to which the present invention is applied.
【図１３】同渦電流減速装置の側面断面図である。FIG. 13 is a side sectional view of the eddy current reduction device.
４：回転軸 ５：取付フランジ ５ａ：スプライン孔
７：制動ドラム ９：ボス部 ９ａ：フランジ部 １
２：スポーク １３：制動ドラム １３ａ：冷却フイン
１３ｃ：内周面 １８：案内筒 １８ａ：外周壁部
１８ｂ：内周壁部 １９， １９Ａ，１９Ｂ：磁石支持筒 ２０， ２０
Ａ， ２０Ｂ：永久磁石 ２０ａ：壁面 ２１：強磁性板 ２１ａ：壁面 ３５：
銅製筒体 ４１：アクチユエータ ４２：シリンダ ４
３：ピストン4: Rotary shaft 5: Mounting flange 5a: Spline hole
7: braking drum 9: boss 9a: flange 1
2: spoke 13: braking drum 13a: cooling fin 13c: inner peripheral surface 18: guide cylinder 18a: outer peripheral wall portion
18b: Inner peripheral wall portion 19, 19A, 19B: Magnet support tube 20, 20
A, 20B: Permanent magnet 20a: Wall surface 21: Ferromagnetic plate 21a: Wall surface 35:
Copper cylinder 41: Actuator 42: Cylinder 4
3: Piston
Claims (4)
の内部に、非磁性体からなりかつ断面長方形の内空部を
有する不動の案内筒を同軸に配設し、前記案内筒の制動
ドラムと対向する外周壁部に周方向等間隔に多数の強磁
性板を結合し、前記案内筒の前記内空部に軸方向移動可
能に支持した磁石支持筒に、前記強磁性板に対する極性
が周方向に交互に異なるよう永久磁石を結合し、前記永
久磁石が前記強磁性板と対向する制動位置と前記永久磁
石が前記強磁性板と対向しない非制動位置とに前記磁石
支持筒を軸方向に往復移動するアクチユエータを備えて
なる永久磁石式渦電流減速装置において、前記強磁性板
は制動ドラムに近づくにつれて周方向の寸法が短くなる
ように、前記強磁性板の周方向端部の壁面が傾斜されて
いることを特徴とする、永久磁石式渦電流減速装置。An immovable guide cylinder made of a non-magnetic material and having an inner space having a rectangular cross section is coaxially disposed inside a brake drum made of a conductor connected to a rotating shaft, and the brake drum of the guide cylinder is provided. A large number of ferromagnetic plates are connected at equal intervals in the circumferential direction to the outer peripheral wall portion facing the outer peripheral wall portion. The permanent magnets are coupled alternately in different directions, and the magnet support cylinder is axially moved to a braking position in which the permanent magnet faces the ferromagnetic plate and a non-braking position in which the permanent magnet does not face the ferromagnetic plate. In a permanent magnet type eddy current reduction device including an actuator that reciprocates, a wall surface of a peripheral end of the ferromagnetic plate is inclined so that a size of the ferromagnetic plate in a circumferential direction decreases as approaching a braking drum. It is characterized by being That, permanent magnet type eddy current reduction apparatus.
の内部に、非磁性体からなりかつ断面長方形の内空部を
有する不動の案内筒を同軸に配設し、前記案内筒の外周
壁部に周方向等間隔に多数の強磁性板を結合し、前記案
内筒の前記内空部に回動可能の磁石支持筒と回動不能の
磁石支持筒とを軸方向に並べて支持し、前記各磁石支持
筒に強磁性板に対する極性が周方向に交互に異なるよう
永久磁石を結合し、前記各強磁性板に対向する前記各磁
石支持筒の永久磁石の極性が同じである制動位置と前記
各強磁性板に対向する前記各磁石支持筒の永久磁石の極
性が異なる非制動位置とに一方の磁石支持筒を正逆回動
するアクチユエータを備えてなる永久磁石式渦電流減速
装置において、前記強磁性板は制動ドラムに近づくにつ
れて周方向の寸法が短くなるように、前記強磁性板の周
方向端部の壁面が傾斜されていることを特徴とする、永
久磁石式渦電流減速装置。2. An immovable guide cylinder made of a non-magnetic material and having an inner space having a rectangular cross section is coaxially disposed inside a braking drum made of a conductor coupled to a rotating shaft, and an outer peripheral wall of the guide cylinder. A large number of ferromagnetic plates are connected to the portion at equal intervals in the circumferential direction, and a rotatable magnet support tube and a non-rotatable magnet support tube are arranged and supported in the inner space of the guide tube in the axial direction. A permanent magnet is coupled to each magnet support cylinder so that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction, and the braking position where the polarity of the permanent magnet of each magnet support cylinder facing each of the ferromagnetic plates is the same, and In the permanent magnet type eddy current reduction device, comprising: an actuator for rotating one of the magnet support cylinders in a forward / reverse direction at a non-braking position having a different polarity of a permanent magnet of each magnet support cylinder facing each ferromagnetic plate. Ferromagnetic plate has a circumferential dimension as it approaches the braking drum As shorter, characterized in that the wall surface of the circumferential end portion of the ferromagnetic plate is tilted, a permanent magnet type eddy current reduction apparatus.
の内部に、非磁性体からなりかつ断面長方形の内空部を
有する不動の案内筒を同軸に配設し、前記案内筒の外周
壁部に周方向等間隔に多数の強磁性板を配設し、前記案
内筒の前記内空部に回動可能に支持した磁石支持筒に、
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２つずつ周方向に交互に異なるよう永久磁石を結合
し、前記各強磁性板に対向する２つの永久磁石の極性が
同じである制動位置と前記各強磁性板に対向する２つの
永久磁石の極性が異なる非制動位置とに前記磁石支持筒
を回動するアクチユエータを備えてなる永久磁石式渦電
流減速装置において、前記強磁性板は制動ドラムに近づ
くにつれて周方向の寸法が短くなるように、強磁性板の
周方向端面が傾斜されていることを特徴とする、永久磁
石式渦電流減速装置。3. An immovable guide cylinder made of a non-magnetic material and having an inner space with a rectangular cross section is coaxially disposed inside a braking drum made of a conductor coupled to a rotating shaft, and an outer peripheral wall of the guide cylinder. A large number of ferromagnetic plates are arranged at equal intervals in the circumferential direction in the portion, and a magnet support cylinder rotatably supported in the inner space of the guide cylinder,
Permanent magnets are coupled so as to face the ferromagnetic plates two by two and alternately differ in polarity with respect to the ferromagnetic plates by two in the circumferential direction, and the two permanent magnets facing the respective ferromagnetic plates have the same polarity. In a permanent magnet type eddy current reduction device comprising an actuator for rotating the magnet support cylinder between a certain braking position and a non-braking position in which two permanent magnets facing each of the ferromagnetic plates have different polarities, A permanent magnet type eddy current reduction device characterized in that a circumferential end face of a ferromagnetic plate is inclined so that a size of the plate in the circumferential direction decreases as approaching the braking drum.
は０〜３０°である、請求項１〜３に記載の永久磁石式
渦電流減速装置。4. The permanent magnet type eddy current reduction device according to claim 1, wherein an inclination angle of a wall surface at a circumferential end portion of the ferromagnetic plate is 0 to 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29335496A JPH10127039A (en) | 1996-10-15 | 1996-10-15 | Permanent magnet eddy current speed reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29335496A JPH10127039A (en) | 1996-10-15 | 1996-10-15 | Permanent magnet eddy current speed reducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10127039A true JPH10127039A (en) | 1998-05-15 |
Family
ID=17793714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29335496A Pending JPH10127039A (en) | 1996-10-15 | 1996-10-15 | Permanent magnet eddy current speed reducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10127039A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1005144A1 (en) * | 1997-06-12 | 2000-05-31 | Isuzu Motors Limited | Permanent magnet type eddy current reduction apparatus |
| EP1073183A2 (en) * | 1999-07-29 | 2001-01-31 | Isuzu Motors Limited | Eddy-current deceleration apparatus |
| EP1124311A2 (en) * | 2000-02-10 | 2001-08-16 | Sumitomo Metal Industries, Ltd | Eddy current braking apparatus |
| US7791237B2 (en) * | 2006-12-19 | 2010-09-07 | General Electric Company | Fault-tolerant synchronous permanent magnet machine |
| CN103335063A (en) * | 2013-06-26 | 2013-10-02 | 镇江市博林光电科技有限公司 | Hermetical transmission structure of high pressure fluid magnetic coupler |
-
1996
- 1996-10-15 JP JP29335496A patent/JPH10127039A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1005144A1 (en) * | 1997-06-12 | 2000-05-31 | Isuzu Motors Limited | Permanent magnet type eddy current reduction apparatus |
| EP1073183A2 (en) * | 1999-07-29 | 2001-01-31 | Isuzu Motors Limited | Eddy-current deceleration apparatus |
| EP1073183A3 (en) * | 1999-07-29 | 2002-07-03 | Isuzu Motors Limited | Eddy-current deceleration apparatus |
| EP1124311A2 (en) * | 2000-02-10 | 2001-08-16 | Sumitomo Metal Industries, Ltd | Eddy current braking apparatus |
| EP1124311A3 (en) * | 2000-02-10 | 2004-08-25 | Sumitomo Metal Industries, Ltd | Eddy current braking apparatus |
| US7791237B2 (en) * | 2006-12-19 | 2010-09-07 | General Electric Company | Fault-tolerant synchronous permanent magnet machine |
| CN103335063A (en) * | 2013-06-26 | 2013-10-02 | 镇江市博林光电科技有限公司 | Hermetical transmission structure of high pressure fluid magnetic coupler |
| CN103335063B (en) * | 2013-06-26 | 2015-09-30 | 镇江市博林光电科技有限公司 | Hermetical transmission structure of high pressure fluid magnetic coupler |
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