JP3285043B2 - Eddy current type reduction gear - Google Patents
Eddy current type reduction gearInfo
- Publication number
- JP3285043B2 JP3285043B2 JP20742192A JP20742192A JP3285043B2 JP 3285043 B2 JP3285043 B2 JP 3285043B2 JP 20742192 A JP20742192 A JP 20742192A JP 20742192 A JP20742192 A JP 20742192A JP 3285043 B2 JP3285043 B2 JP 3285043B2
- Authority
- JP
- Japan
- Prior art keywords
- ferromagnetic plate
- circumferential
- ferromagnetic
- magnet
- rear end
- 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.)
- Expired - Fee Related
Links
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は主として大型車両の摩擦
ブレーキを補助する渦電流式減速装置、特に制動ドラム
の内周面と磁石支持筒に周方向等間隔に並設した多数の
永久磁石（以下単に磁石という）との間に介在する強磁
性板の回転位相を変えるか、磁石支持筒を軸方向へ移動
することにより、制動と非制動の切換えを行う渦電流式
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 type speed reducer for assisting a friction brake of a large vehicle, and more particularly to a large number of permanent magnets (e.g. The present invention relates to an eddy-current type speed reducer that switches between braking and non-braking by changing the rotation phase of a ferromagnetic plate interposed between the magnets and moving the magnet support cylinder in the axial direction. .
【０００２】[0002]
【従来の技術】特開平1-298948号公報に開示される渦電
流式減速装置では、制動ドラムの内部に非磁性体からな
る断面箱形の固定筒を配設し、固定筒の外周壁に周方向
等間隔に多数の強磁性板（ポールピース）を結合し、固
定筒の内空部に回動可能に支持した磁石支持筒に、各強
磁性板に対向する磁石を結合し、磁石支持筒の回転位相
を強磁性板の半配列ピツチだけ変えることにより、制動
と非制動の切換えを行うようにしている。2. Description of the Related Art In an eddy current type speed reducer disclosed in Japanese Patent Application Laid-Open No. 1-298948, a fixed cylinder having a box-shaped cross section made of a non-magnetic material is disposed inside a braking drum, and the fixed cylinder has an outer peripheral wall. A large number of ferromagnetic plates (pole pieces) are connected at equal intervals in the circumferential direction, and a magnet supporting tube rotatably supported in the inner space of the fixed tube is connected to a magnet opposed to each ferromagnetic plate. Switching between braking and non-braking is performed by changing the rotation phase of the cylinder by half the pitch of the ferromagnetic plate.
【０００３】図５に示すように、上述の渦電流式減速装
置では、磁石支持筒１４の磁石２４は、強磁性板１５と
同じ配列ピツチで、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並設される。外部の熱、水、埃な
どの環境から磁石２４を保護するために、磁石２４は非
磁性体からなる固定筒１０の断面長方形の内空部に密封
されている。制動時、磁石２４は固定筒１０の外周壁１
０ａの強磁性板１５を経て、回転する制動ドラム７との
間に磁気回路（線２６で示す）を形成し、制動ドラム７
に制動力を及ぼす。制動ドラム７が回転していると、磁
石２４から発生する多量の磁束が強磁性板１５を経て制
動ドラム７へ達する時、制動ドラム７の内部に発生する
渦電流に基づく反抗磁界により、磁気回路は制動ドラム
７の回転方向（矢印ｘ方向）へ引きずられた形に歪曲す
る。上述の磁気回路の歪曲は制動ドラム７の回転数が高
くなるほど強くなる。すなわち、制動ドラム７が矢印ｘ
方向へ回転している時、磁石２４からの磁束密度が強磁
性板１５の前端部（制動ドラム７の回転方向前端部）で
蜜になり、磁束の一部は強磁性板１５を結合する固定筒
１０の外周壁１０ａを経て制動ドラム７へ達する。As shown in FIG. 5, in the eddy current type speed reducer described above, the magnets 24 of the magnet support cylinder 14 have the same arrangement pitch as the ferromagnetic plate 15 and the polarity with respect to the ferromagnetic plate 15 alternates in the circumferential direction. They are juxtaposed differently. In order to protect the magnet 24 from external heat, water, dust and the like, the magnet 24 is hermetically sealed in the inner space of the fixed cylinder 10 made of a non-magnetic material and having a rectangular cross section. At the time of braking, the magnet 24 is attached to the outer peripheral wall 1 of the fixed cylinder 10.
A magnetic circuit (indicated by a line 26) is formed between the brake drum 7 and the rotating brake drum 7 via the ferromagnetic plate 15a of the brake drum 7a.
Apply braking force to When the brake drum 7 rotates, when a large amount of magnetic flux generated from the magnet 24 reaches the brake drum 7 via the ferromagnetic plate 15, a magnetic circuit is generated by a repulsive magnetic field based on an eddy current generated inside the brake drum 7. Is distorted so as to be dragged in the rotation direction of the braking drum 7 (the direction of the arrow x). The above-described distortion of the magnetic circuit increases as the rotation speed of the braking drum 7 increases. That is, the braking drum 7 is moved in the direction of the arrow x.
When rotating in the direction, the magnetic flux density from the magnet 24 becomes small at the front end of the ferromagnetic plate 15 (the front end in the rotation direction of the braking drum 7), and a part of the magnetic flux is fixed to couple the ferromagnetic plate 15 It reaches the braking drum 7 via the outer peripheral wall 10a of the cylinder 10.
【０００４】[0004]
【発明が解決しようとする課題】上述のように、磁束の
強磁性板の前端部への集中は、磁気飽和をもたらし、制
動ドラムへ達する磁界を弱めるので、制動力の低下をも
たらす。本発明の目的は上述の問題に鑑み、強磁性板の
断面形状を変えることにより、強磁性板の前端部におけ
る磁束の集中を抑え、制動効率を高める、渦電流式減速
装置を提供することにある。As described above, the concentration of magnetic flux on the front end of the ferromagnetic plate causes magnetic saturation and weakens the magnetic field reaching the braking drum, thereby reducing the braking force. In view of the above problems, an object of the present invention is to provide an eddy current type reduction gear that suppresses the concentration of magnetic flux at the front end of a ferromagnetic plate and increases braking efficiency by changing the cross-sectional shape of the ferromagnetic plate. is there.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明の構成は回転軸に結合した制動ドラムの内部
に非磁性体からなる断面箱形の案内筒を配設し、案内筒
の外周壁に周方向等間隔に多数の強磁性板を結合し、案
内筒の内空部に回動可能に支持した磁石支持筒に、各強
磁性板に１つずつ対応して強磁性板に対する極性が周方
向に交互に異なるように永久磁石を結合した渦電流式減
速装置において、永久磁石の相互の周方向隙間を永久磁
石の周方向寸法よりも狭く、各強磁性板の内周面の周方
向寸法を永久磁石の周方向寸法とほぼ同寸とし、各強磁
性板は制動ドラムの回転方向後端部の外周側部分を、制
動ドラムの回転方向後方へ突出して強磁性板の後端面を
傾斜面とし、各強磁性板の後端部外周面と後隣りの強磁
性板の前端との隙間を、各強磁性板の後端部内周面と後
隣りの強磁性板の前端との隙間のほぼ半分にしたことを
特徴とする。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る断面箱形の案内筒を
配設し、案内筒の外周壁に周方向等間隔に多数の強磁性
板を結合し、案内筒の内空部に軸方向移動可能に支持し
た磁石支持筒に、各強磁性板に１つずつ対応して強磁性
板に対する極性が周方向に交互に異なるように永久磁石
を結合した渦電流式減速装置において、永久磁石の相互
の周方向隙間を永久磁石の周方向寸法よりも狭く、各強
磁性板の内周面の周方向寸法を永久磁石の周方向寸法と
ほぼ同寸とし、各強磁性板は制動ドラムの回転方向後端
部の外周側部分を、制動ドラムの回転方向後方へ突出し
て強磁性板の後端面を傾斜面とし、各強磁性板の後端部
外周面と後隣りの強磁性板の前端との隙間を、各強磁性
板の後端部内周面と後隣りの強磁性板の前端との隙間の
ほぼ半分にしたことを特徴とする。In order to achieve the above object, according to the present invention, a guide cylinder having a box-shaped cross section made of a non-magnetic material is provided inside a brake drum connected to a rotating shaft. A large number of ferromagnetic plates are connected to the outer peripheral wall of the magnet at equal intervals in the circumferential direction. In the eddy current type speed reducer in which permanent magnets are coupled so that their polarities alternately differ in the circumferential direction, the circumferential gap between the permanent magnets is smaller than the circumferential dimension of the permanent magnets, and the inner circumferential surface of each ferromagnetic plate. The circumferential dimension of the ferromagnetic plate is approximately the same as the circumferential dimension of the permanent magnet, and each ferromagnetic plate projects the outer peripheral portion of the rear end of the brake drum in the rotation direction, rearward in the rotation direction of the brake drum, and The end surface is an inclined surface, and the gap between the rear end outer peripheral surface of each ferromagnetic plate and the front end of the ferromagnetic plate adjacent to the rear is And characterized by being approximately half of the gap between the front end of the ferromagnetic plate next to the rear and the rear end portion inner peripheral surface of each ferromagnetic plate. Further, in the configuration of the present invention, a guide cylinder having a box-shaped cross section made of a non-magnetic material is disposed inside a braking drum coupled to a rotating shaft, and a large number of ferromagnetic plates are arranged at equal circumferential intervals on an outer peripheral wall of the guide cylinder. Permanent magnets are coupled to the magnet support cylinder, which is supported in the inner space of the guide cylinder so as to be movable in the axial direction, so that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction, one for each ferromagnetic plate. In the coupled eddy current type reduction gear, the circumferential gap between the permanent magnets is smaller than the circumferential dimension of the permanent magnet, and the circumferential dimension of the inner circumferential surface of each ferromagnetic plate is substantially the same as the circumferential dimension of the permanent magnet. Each ferromagnetic plate protrudes rearward in the rotation direction of the braking drum from the outer peripheral portion of the rear end of the braking drum in the rotation direction, and the rear end surface of the ferromagnetic plate is inclined, and the rear end of each ferromagnetic plate is inclined. The gap between the outer peripheral surface and the front end of the ferromagnetic plate adjacent to the rear is adjusted by the inner peripheral surface Characterized by being approximately half of the gap between the front end of the sexual plate.
【０００６】[0006]
【作用】本発明では強磁性板の後端部の外周側部分を、
制動ドラムの回転方向後方へ突出する。したがつて、強
磁性板の前端側で磁化された制動ドラムは回転に伴つ
て、前隣りの磁石の後端部に磁界を及ぼすことになり、
それだけ磁気回路が強磁性板の後端部即ち制動ドラムの
回転方向後方へ偏倚されることになり、強磁性板の前端
部への磁束集中が抑えられる。換言すれば、強磁性板の
前端部における磁気（磁束密度）の飽和が抑えられるの
で、磁石支持筒と制動ドラムとの間に磁気飽和のない効
率的な磁気回路が生じ、制動効率が高められる。According to the present invention, the outer peripheral portion of the rear end of the ferromagnetic plate is
The brake drum projects rearward in the rotation direction of the drum. Therefore, the braking drum magnetized on the front end side of the ferromagnetic plate exerts a magnetic field on the rear end of the magnet adjacent to the front with the rotation.
As a result, the magnetic circuit is deflected to the rear end of the ferromagnetic plate, that is, to the rear in the rotation direction of the brake drum, and the concentration of magnetic flux on the front end of the ferromagnetic plate is suppressed. In other words, since the saturation of the magnetism (magnetic flux density) at the front end of the ferromagnetic plate is suppressed, an efficient magnetic circuit without magnetic saturation is generated between the magnet support cylinder and the braking drum, and the braking efficiency is increased. .
【０００７】[0007]
【実施例】図１は本発明による渦電流式減速装置の側面
断面図、図２は同正面断面図である。本発明による渦電
流式減速装置は、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固定筒１０と、固
定筒１０の断面長方形の内空部に回動可能に支持した磁
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、かつ複数のボルト４とナツトに
より締結される。ボス５から放射状に延びる多数のスポ
ーク６に、冷却フイン８を備えた制動ドラム７の一端が
結合される。1 is a side sectional view of an eddy current type speed reducer according to the present invention, and FIG. 2 is a front sectional view thereof. An eddy current type speed reducer according to the present invention includes a braking drum 7 made of a conductor coupled to an output rotation shaft 1 of a vehicle transmission, for example, and a braking drum 7.
And a magnet support tube 14 rotatably supported in the inner space of the fixed tube 10 having a rectangular cross section. The brake drum 7 overlaps the flange portion 5a of the boss 5 together 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 has a plurality of bolts 4 and nuts. Is concluded. One end of a brake drum 7 having a cooling fin 8 is connected to a number of spokes 6 extending radially from the boss 5.
【０００８】断面箱形の固定筒１０は例えば断面Ｃ字形
の筒体に、環状の蓋板１１を結合して構成される。固定
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。固定筒１０の外周壁１０ａに多数の強磁性板１
５が周方向等間隔に結合される。好ましくは、強磁性板
１５は固定筒１０の成形時鋳ぐるまれる。強磁性板１５
は長方形の板状のものであつて、板面は円弧状に湾曲さ
れる。強磁性板１５の周壁は突条２５を一体に形成さ
れ、固定筒１０の外周壁１０ａと強磁性板１５との鋳造
による結合度を高める。磁石支持筒１４は固定筒１０の
内空部、詳しくは内周壁１０ｂに軸受１２により回動可
能に支持される。The fixed cylinder 10 having a box-shaped cross section is formed by connecting an annular cover plate 11 to a cylinder having a C-shaped cross section, for example. The fixed cylinder 10 is fixed by a suitable means, for example, to a gearbox of a transmission. A large number of ferromagnetic plates 1 are provided on the outer peripheral wall 10a of the fixed cylinder 10.
5 are connected at equal intervals in the circumferential direction. Preferably, the ferromagnetic plate 15 is cast when the fixed cylinder 10 is formed. Ferromagnetic plate 15
Is a rectangular plate, and the plate surface is curved in an arc shape. The peripheral wall of the ferromagnetic plate 15 is formed integrally with the ridge 25 to enhance the coupling between the outer peripheral wall 10a of the fixed cylinder 10 and the ferromagnetic plate 15 by casting. The magnet support cylinder 14 is rotatably supported by the bearing 12 on the inner space of the fixed cylinder 10, specifically, on the inner peripheral wall 10 b.
【０００９】固定筒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
るロツドは、磁石支持筒１４から固定筒１０の左端壁の
円弧状のスリツト１８ａを経て突出する腕１６に連結さ
れる。Preferably, three fluid pressure actuators 20 are connected to the left end wall of the fixed cylinder 10 at equal circumferential intervals. The fluid pressure actuator 20 has a piston 17 fitted in a cylinder 18, and a rod projecting outward from the piston 17 has an arm 16 projecting from the magnet support cylinder 14 through an arc-shaped slit 18a on the left end wall of the fixed cylinder 10. Linked to
【００１０】図２に示すように、磁石支持筒１４は各強
磁性板１５に１つずつ対応する磁石２４を結合される。
磁石支持筒１４は磁性体からなり、各強磁性板１５に対
向する磁石２４は、極性が周方向に交互に異なるように
配設される。As shown in FIG. 2, the magnet support cylinder 14 has a magnet 24 corresponding to each ferromagnetic plate 15 one by one.
The magnet support tube 14 is made of a magnetic material, and the magnets 24 facing the ferromagnetic plates 15 are arranged so that the polarities are alternately different in the circumferential direction.
【００１１】本発明によれば、強磁性板１５は内周面の
周方向長さＬを磁石２４の外周面の周方向長さと同寸と
し、後端部１５ｂの外周側部分を制動ドラム７の回転方
向後方（矢印ｘと反対方向）へ突出させる。図２に示す
実施例では、後端部１５ｂは強磁性板１５の径方向線に
対し傾斜した面として構成される。強磁性板１５の前端
部１５ａは、図３に示すように、軽量化のために外周側
部分を後端部１５ｂとほぼ平行にカツトしてもよい。According to the present invention, the ferromagnetic plate 15 has a circumferential length L of the inner circumferential surface equal to the circumferential length of the outer circumferential surface of the magnet 24, and an outer circumferential portion of the rear end portion 15b provided on the brake drum 7. In the rotation direction (direction opposite to arrow x). In the embodiment shown in FIG. 2, the rear end portion 15b is formed as a surface inclined with respect to the radial line of the ferromagnetic plate 15. As shown in FIG. 3, the front end portion 15a of the ferromagnetic plate 15 may have an outer peripheral side portion cut substantially parallel to the rear end portion 15b for weight reduction.
【００１２】次に、本発明による渦電流式減速装置の作
動について説明する。非制動時、図３に示すように、極
性が異なる２つの磁石２４が部分的に共通の強磁性板１
５に対向する。各強磁性板１５と磁石支持筒１４との間
に、線２７で示す短絡的磁気回路が生じ、磁石２４は磁
界を制動ドラム７に及ぼさない。Next, the operation of the eddy current type speed reducer according to the present invention will be described. When the brake is not applied, as shown in FIG. 3, two magnets 24 having different polarities partially share the common ferromagnetic plate 1.
5. Between each ferromagnetic plate 15 and the magnet support tube 14 a short-circuit magnetic circuit is created, indicated by line 27, and the magnet 24 does not apply a magnetic field to the braking drum 7.
【００１３】制動時、流体圧アクチユエータ２０により
磁石支持筒１４を強磁性板１５の半配列ピツチ分だけ回
動すると、図２に示すように、各磁石２４は各強磁性板
１５に全面的に対向し、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は制
動トルクを受ける。At the time of braking, when the magnet support cylinder 14 is rotated by a half-pitch of the ferromagnetic plate 15 by the fluid pressure actuator 20, each magnet 24 is entirely attached to each ferromagnetic plate 15 as shown in FIG. A magnetic field is applied to the braking drum 7 through 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.
【００１４】制動時、制動ドラム７が回転していると、
磁石２４から強磁性板１５を経て制動ドラム７へ及ぶ磁
界は、制動ドラム７の回転方向へ引きずられた格好に歪
曲される。しかし、本発明によれば、強磁性板１５の後
端部１５ｂの外周側部分が後方へ突出しているので、磁
石２４を挟んで制動ドラム７と磁石支持筒１４とに形成
される磁気回路（線２６ａで示す）は、制動ドラム７の
回転方向前方の強磁性板１５の後端部１５ｂで、前隣り
の磁石２４との間の円滑な磁気回路を形成し、磁気回路
の制動ドラム７の回転方向へのずれないし歪曲が抑えら
れる。つまり、強磁性板１５を通過する磁束分布が、従
来よりも回転方向後方側へ引き寄せられた格好になり、
強磁性板１５の前端部１５ａでの磁束密度の集中が回避
される。したがつて、強磁性板１５の前端部１５ａでの
磁気飽和が起らないから、磁石２４と制動ドラム７との
間に効率的な磁気回路が形成され（各強磁性板１５を通
過する磁束数が増加する）、制動能力が増大する。At the time of braking, if the braking drum 7 is rotating,
The magnetic field that reaches the brake drum 7 from the magnet 24 via the ferromagnetic plate 15 is distorted in such a manner as to be dragged in the rotation direction of the brake drum 7. However, according to the present invention, since the outer peripheral portion of the rear end portion 15b of the ferromagnetic plate 15 protrudes rearward, the magnetic circuit formed between the brake drum 7 and the magnet support tube 14 with the magnet 24 interposed therebetween. A line 26a) is a rear end portion 15b of the ferromagnetic plate 15 in the rotation direction of the braking drum 7 and forms a smooth magnetic circuit between the magnet 24 adjacent to the front and a magnetic circuit. Displacement or distortion in the rotation direction is suppressed. That is, the distribution of the magnetic flux passing through the ferromagnetic plate 15 is drawn more toward the rear in the rotation direction than in the related art,
Concentration of magnetic flux density at the front end 15a of the ferromagnetic plate 15 is avoided. Therefore, since magnetic saturation does not occur at the front end 15a of the ferromagnetic plate 15, an efficient magnetic circuit is formed between the magnet 24 and the braking drum 7, and the magnetic flux passing through each ferromagnetic plate 15 is formed. Number increases) and the braking capacity increases.
【００１５】本発明は上述した形式の減速装置に限定さ
れるものではなく、図４に示す形式の渦電流式減速装置
にも適用できる。図４に示す減速装置では、磁石２３ａ
を支持する磁石支持筒１３と磁石２４ａを支持する磁石
支持筒１４とが、固定筒１０の内空部に収容される。磁
石支持筒１３は内周壁１０ｂに軸受１２により磁石の配
列ピツチ分だけ回動可能に支持される一方、磁石支持筒
１４は内周壁１０ｂに嵌合され、かつボルト２１により
右端壁１１に固定される。磁石支持筒１３の外周面に周
方向等間隔に多数の磁石２３ａが結合される。磁石支持
筒１４の外周面にも同間隔で多数の磁石２４ａが結合さ
れる。各磁石２３ａ，２４ａは磁石支持筒１３，１４に
接合する内面と、強磁性板１５に対向する外面とが磁極
となつており、外面の極性が周方向に交互に異なるよう
に配列される。強磁性板１５は非磁性体からなる外周壁
１０ａの開口に嵌合支持され、磁石２３ａ，２４ａと同
配列ピツチで並ぶように配列される。他の構成について
は図１のものと同様である。The present invention is not limited to the speed reducer of the type described above, but can also be applied to an eddy current type speed reducer of the type shown in FIG. In the reduction gear transmission shown in FIG.
And a magnet support tube 14 supporting the magnet 24a are accommodated in the inner space of the fixed tube 10. The magnet support cylinder 13 is rotatably supported by the bearing 12 on the inner peripheral wall 10b by the bearing pitch, while the magnet support cylinder 14 is fitted to the inner peripheral wall 10b and fixed to the right end wall 11 by bolts 21. You. A large number of magnets 23a are connected to the outer peripheral surface of the magnet support cylinder 13 at equal intervals in the circumferential direction. A large number of magnets 24a are also coupled to the outer peripheral surface of the magnet support tube 14 at equal intervals. The magnets 23a and 24a have an inner surface joined to the magnet support cylinders 13 and 14 and an outer surface facing the ferromagnetic plate 15 serving as magnetic poles, and are arranged so that the polarities of the outer surfaces are alternately different in the circumferential direction. The ferromagnetic plate 15 is fitted and supported in the opening of the outer peripheral wall 10a made of a non-magnetic material, and is arranged so as to be aligned with the magnets 23a and 24a at the same arrangement pitch. Other configurations are the same as those in FIG.
【００１６】上述の実施例では、非制動時、磁石支持筒
１４の磁石２４ａと磁石支持筒１３の磁石２３ａとは、
図４のように磁石の配列ピツチ分だけずれ、強磁性板１
５に対向する極性が互いに反対になつている。この時、
図４に矢印で示すように、短絡的磁気回路２７ａが形成
されるので、各磁石２３ａ，２４ａから制動ドラム７の
内周面へ垂直に作用する磁界は極めて微弱なものとな
り、制動ドラム７に制動トルクを及ぼさない。In the above-described embodiment, when braking is not performed, the magnet 24a of the magnet support tube 14 and the magnet 23a of the magnet support tube 13
As shown in FIG. 4, the ferromagnetic plate 1 is shifted by the arrangement pitch of the magnets.
The polarities facing 5 are opposite to each other. At this time,
As shown by the arrow in FIG. 4, the short-circuit magnetic circuit 27a is formed, so that the magnetic field acting perpendicularly from the magnets 23a and 24a to the inner peripheral surface of the braking drum 7 is extremely weak. No braking torque is applied.
【００１７】制動時、流体圧アクチユエータ２０により
磁石支持筒１３を磁石の配列ピツチ分だけ回動すると、
磁石支持筒１３の磁石２３ａと磁石支持筒１４の磁石２
４ａとは極性が同じく横に並び、図２の場合と同様に、
各磁石２３ａ，２４ａが制動ドラム７と磁石支持筒１
３，１４の間で磁気回路を形成する。At the time of braking, when the magnet supporting cylinder 13 is rotated by the fluid pressure actuator 20 by an arrangement pitch of the magnets,
The magnet 23a of the magnet support tube 13 and the magnet 2 of the magnet support tube 14
4a has the same polarity as that of FIG.
Each of the magnets 23a and 24a is composed of the braking drum 7 and the magnet support cylinder 1.
A magnetic circuit is formed between 3 and 14.
【００１８】また、本発明は軸方向に長い固定筒の内部
で磁石支持筒を軸方向に移動し、磁石が強磁性板に対向
する制動位置と、磁石が制動ドラムから軸方向に引退し
て強磁性板に対向しない非制動時とに、切り換えられる
形式の減速装置にも適用できる。Further, according to the present invention, the magnet support cylinder is moved in the axial direction inside the fixed cylinder that is long in the axial direction, and the braking position where the magnet faces the ferromagnetic plate, and the magnet retreats in the axial direction from the braking drum. The present invention can also be applied to a speed reducer of a type that can be switched between when the brake is not applied to the ferromagnetic plate and when the brake is not applied.
【００１９】[0019]
【発明の効果】本発明は上述のように、制動ドラムの内
側に断面長方形の内空部を有する固定筒を配設し、固定
筒の内空部に固定筒の外周壁に対向する極性が周方向に
交互に異なるよう多数の永久磁石を配列した磁石支持筒
を回動可能に支持し、固定筒の外周壁に磁石支持筒の各
永久磁石に対向する強磁性板を埋設し、強磁性板は制動
ドラムの回転方向後端部の外周側部分を、制動ドラムの
回転方向後方へ突出したものであるから、各強磁性板の
後端側で磁化された制動ドラムは回転に伴つて、前隣り
の強磁性板の後端部を介して前隣りの磁石に対向し、そ
れだけ磁束が強磁性板の後端部（制動ドラムの回転方向
後側）へ偏倚されることとなり、強磁性板の前端部への
磁束集中が抑えられる。換言すれば、強磁性板の前端部
における磁気の飽和が抑えられるので、制動ドラムへ達
する磁束が増加し、磁石支持筒と制動ドラムとの間に効
率的な磁気回路が生じ、制動効率ないし制動能力が高め
られる。As described above, according to the present invention, a fixed cylinder having an inner space with a rectangular cross section is disposed inside the braking drum, and the inner space of the fixed cylinder has a polarity facing the outer peripheral wall of the fixed cylinder. A magnet support cylinder in which a large number of permanent magnets are arranged so as to be alternately arranged in the circumferential direction is rotatably supported, and a ferromagnetic plate facing each permanent magnet of the magnet support cylinder is buried on the outer peripheral wall of the fixed cylinder, and ferromagnetic Since the plate protrudes rearward in the rotation direction of the braking drum, the braking drum magnetized on the rear end side of each ferromagnetic plate rotates along with the rotation of the braking drum. The magnet is opposed to the magnet adjacent to the front side through the rear end of the ferromagnetic plate adjacent to the front side, and the magnetic flux is accordingly biased toward the rear end of the ferromagnetic plate (rear side in the rotation direction of the braking drum). The concentration of magnetic flux on the front end of the wire is suppressed. In other words, since the magnetic saturation at the front end of the ferromagnetic plate is suppressed, the magnetic flux reaching the braking drum increases, and an efficient magnetic circuit is generated between the magnet support cylinder and the braking drum, and the braking efficiency or braking is reduced. Ability is enhanced.
【図１】本発明に係る渦電流式減速装置の側面断面図で
ある。FIG. 1 is a side sectional view of an eddy current type reduction gear according to the present invention.
【図２】図１の線２Ａ−２Ａによる減速装置の制動時の
正面断面図である。FIG. 2 is a front sectional view of the speed reduction device during braking, taken along line 2A-2A in FIG. 1;
【図３】本発明の変更実施例に係る強磁性板を備えた減
速装置の非制動時の正面断面図である。FIG. 3 is a front sectional view of a speed reducer having a ferromagnetic plate according to a modified embodiment of the present invention when no braking is performed.
【図４】本発明に係る他の形式の渦電流式減速装置の側
面断面図である。FIG. 4 is a side sectional view of another type of eddy current type speed reducer according to the present invention.
【図５】従来の渦電流式減速装置の正面断面図である。FIG. 5 is a front sectional view of a conventional eddy current type speed reducer.
７：制動ドラム １０：固定筒 １３，１４：磁石支持
筒 １５：強磁性板 １５ｂ：後端部 ２４，２３ａ，
２４ａ：磁石7: braking drum 10: fixed cylinder 13, 14: magnet support cylinder 15: ferromagnetic plate 15b: rear end 24, 23a,
24a: magnet
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 榎園正人、外３名，ＥＣＢリターダの 有限要素シミュレーション，第３回電磁 力関連のダイナミックスシンポジウム講 演論文集，日本，日本機会学会、電気学 会 共催，1991年 ５月12日，480−485 ＴＡＫＡＨＡＳＨＩ Ｎｏｒｉｏ，ｅ ｔ ａｌ．，Ｏｐｔｉｍａｌ Ｄｅｓｉ ｇｎ ｏｆ Ｐｅｒｍａｎｅｎｔ Ｍａ ｇｎｅｔ Ｔｙｐｅ ｏｆ Ｒｅｔａｒ ｄｅｒ，Ｔｈｅ Ｓｅｃｏｎｄ Ｉｎｔ ｅｒｎａｔｉｏｎａｌ Ｓｙｍｐｏｓｉ ｕｍ ｏｎ Ｌｉｎｅａｒ Ｄｒｉｖｅ ｓ ｆｏｒ Ｉｎｄｕｓｔｒｙ Ａｐｐ ｌｉｃａｔｉｏｎｓ，日本，ＬＤＩＲ ’98 Ｔｏｋｙｏ，Ｊａｐａｎ，1998年 ４月 ８日，375−378 (58)調査した分野(Int.Cl.7，ＤＢ名) H02K 49/02 H02K 49/10 ────────────────────────────────────────────────── ─── Continuing the front page (56) References Masato Enozono, 3 others, Finite Element Simulation of ECB Retarder, 3rd Electromagnetics-related Dynamics Symposium Proceedings, Japan, Japan Opportunity Society, Institute of Electrical Engineers Co-sponsor, May 12, 1991, 480-485 TAKAHASHI Norio, et al. , Optimal Design of Permanent Magnet Type of Retar der, The Second International Symposium on Linear Driving Japan, August 8, 1998, April 8, 1998. Field surveyed (Int.Cl. 7 , DB name) H02K 49/02 H02K 49/10
Claims (2)
性体からなる断面箱形の案内筒を配設し、案内筒の外周
壁に周方向等間隔に多数の強磁性板を結合し、案内筒の
内空部に回動可能に支持した磁石支持筒に、各強磁性板
に１つずつ対応して強磁性板に対する極性が周方向に交
互に異なるように永久磁石を結合した渦電流式減速装置
において、永久磁石の相互の周方向隙間を永久磁石の周
方向寸法よりも狭く、各強磁性板の内周面の周方向寸法
を永久磁石の周方向寸法とほぼ同寸とし、各強磁性板は
制動ドラムの回転方向後端部の外周側部分を、制動ドラ
ムの回転方向後方へ突出して強磁性板の後端面を傾斜面
とし、各強磁性板の後端部外周面と後隣りの強磁性板の
前端との隙間を、各強磁性板の後端部内周面と後隣りの
強磁性板の前端との隙間のほぼ半分にしたことを特徴と
する渦電流式減速装置。1. A guide cylinder having a box-shaped cross section made of a non-magnetic material is disposed inside a brake drum connected to a rotating shaft, and a number of ferromagnetic plates are connected to an outer peripheral wall of the guide cylinder at equal intervals in a circumferential direction. A vortex in which permanent magnets are coupled to a magnet support cylinder rotatably supported in the inner space of the guide cylinder such that the polarity of the ferromagnetic plate is alternately different in the circumferential direction, one for each ferromagnetic plate. In the current-type reduction gear, the circumferential gap between the permanent magnets is smaller than the circumferential dimension of the permanent magnet, and the circumferential dimension of the inner peripheral surface of each ferromagnetic plate is substantially the same as the circumferential dimension of the permanent magnet. Each ferromagnetic plate protrudes rearward in the rotational direction of the braking drum, and forms a rear end surface of the ferromagnetic plate as an inclined surface. The gap between the front end of the ferromagnetic plate adjacent to the back is defined by the inner peripheral surface of the rear end of each ferromagnetic plate and the front end of the ferromagnetic plate adjacent to the back. Eddy current reduction gear, characterized in that the approximately half of the gap.
性体からなる断面箱形の案内筒を配設し、案内筒の外周
壁に周方向等間隔に多数の強磁性板を結合し、案内筒の
内空部に軸方向移動可能に支持した磁石支持筒に、各強
磁性板に１つずつ対応して強磁性板に対する極性が周方
向に交互に異なるように永久磁石を結合した渦電流式減
速装置において、永久磁石の相互の周方向隙間を永久磁
石の周方向寸法よりも狭く、各強磁性板の内周面の周方
向寸法を永久磁石の周方向寸法とほぼ同寸とし、各強磁
性板は制動ドラムの回転方向後端部の外周側部分を、制
動ドラムの回転方向後方へ突出して強磁性板の後端面を
傾斜面とし、各強磁性板の後端部外周面と後隣りの強磁
性板の前端との隙間を、各強磁性板の後端部内周面と後
隣りの強磁性板の前端との隙間のほぼ半分にしたことを
特徴とする渦電流式減速装置。2. A guide cylinder having a box-shaped cross section made of a non-magnetic material is disposed inside a brake drum connected to a rotation shaft, and a number of ferromagnetic plates are connected to an outer peripheral wall of the guide cylinder at equal intervals in a circumferential direction. Permanent magnets are coupled to the magnet support cylinder, which is supported in the inner space of the guide cylinder so as to be movable in the axial direction, so that the polarity with respect to the ferromagnetic plate is alternately different in the circumferential direction, one for each ferromagnetic plate. In the eddy current type reduction gear, the circumferential gap between the permanent magnets is smaller than the circumferential dimension of the permanent magnet, and the circumferential dimension of the inner peripheral surface of each ferromagnetic plate is substantially the same as the circumferential dimension of the permanent magnet. , Each ferromagnetic plate protrudes rearward in the rotational direction of the brake drum, and the rear end surface of the ferromagnetic plate is inclined, and the outer peripheral portion of the rear end in the rotational direction of the brake drum is inclined. And the gap between the front end of the ferromagnetic plate adjacent to the rear and the inner peripheral surface of the rear end of each ferromagnetic plate and the ferromagnetic plate adjacent to the rear. Eddy current reduction gear, characterized in that the approximately half of the gap between the edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20742192A JP3285043B2 (en) | 1992-07-10 | 1992-07-10 | Eddy current type reduction gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20742192A JP3285043B2 (en) | 1992-07-10 | 1992-07-10 | Eddy current type reduction gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0638505A JPH0638505A (en) | 1994-02-10 |
| JP3285043B2 true JP3285043B2 (en) | 2002-05-27 |
Family
ID=16539479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20742192A Expired - Fee Related JP3285043B2 (en) | 1992-07-10 | 1992-07-10 | Eddy current type reduction gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3285043B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000116108A (en) | 1998-09-30 | 2000-04-21 | Isuzu Motors Ltd | Fddy-current reduction gear |
| JP2009232528A (en) * | 2008-03-21 | 2009-10-08 | Tbk:Kk | Eddy-current braking device |
-
1992
- 1992-07-10 JP JP20742192A patent/JP3285043B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| ＴＡＫＡＨＡＳＨＩ Ｎｏｒｉｏ，ｅｔ ａｌ．，Ｏｐｔｉｍａｌ Ｄｅｓｉｇｎ ｏｆ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ Ｔｙｐｅ ｏｆ Ｒｅｔａｒｄｅｒ，Ｔｈｅ Ｓｅｃｏｎｄ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｓｙｍｐｏｓｉｕｍ ｏｎ Ｌｉｎｅａｒ Ｄｒｉｖｅｓ ｆｏｒ Ｉｎｄｕｓｔｒｙ Ａｐｐｌｉｃａｔｉｏｎｓ，日本，ＬＤＩＲ ’９８ Ｔｏｋｙｏ，Ｊａｐａｎ，１９９８年 ４月 ８日，３７５−３７８ |
| 榎園正人、外３名，ＥＣＢリターダの有限要素シミュレーション，第３回電磁力関連のダイナミックスシンポジウム講演論文集，日本，日本機会学会、電気学会 共催，１９９１年 ５月１２日，４８０−４８５ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0638505A (en) | 1994-02-10 |
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