JP3484992B2 - Eddy current speed reducer - Google Patents
Eddy current speed reducerInfo
- Publication number
- JP3484992B2 JP3484992B2 JP27772198A JP27772198A JP3484992B2 JP 3484992 B2 JP3484992 B2 JP 3484992B2 JP 27772198 A JP27772198 A JP 27772198A JP 27772198 A JP27772198 A JP 27772198A JP 3484992 B2 JP3484992 B2 JP 3484992B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- rotor
- eddy current
- switch plate
- braking
- 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]
【発明の属する技術分野】本発明は、制動補助装置とし
てバスやトラック等の大型自動車に取付けられる渦電流
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 speed reducer mounted on a large automobile such as a bus or a truck as a braking assist device.
【0002】[0002]
【従来の技術】近年、バスやトラック等の大型自動車に
は、長い降坂時等において、安定した減速を行い、フッ
トブレーキの使用回数を減少させて、ライニングの異常
摩耗やフェード現象を防止すると共に、制動停止距離を
短縮することを目的として、主ブレーキであるフットブ
レーキや補助ブレーキである排気ブレーキの他に渦電流
減速装置が取付けられるようになってきた。この渦電流
減速装置には、磁石として、電磁石を使用するものと、
永久磁石を使用するものがあるが、最近では、制動時に
通電を必要としない永久磁石を使用したものが多くなっ
てきている。2. Description of the Related Art In recent years, for large automobiles such as buses and trucks, stable deceleration is performed during long downhill trips and the number of times the foot brake is used is reduced to prevent abnormal wear of the lining and fade phenomenon. At the same time, for the purpose of shortening the braking stop distance, an eddy current speed reducer has been installed in addition to the foot brake which is a main brake and the exhaust brake which is an auxiliary brake. This eddy current speed reducer uses an electromagnet as a magnet,
Some use permanent magnets, but recently, many use permanent magnets that do not require energization during braking.
【0003】この永久磁石を使用した渦電流式減速装置
の一例である特開平1−298948号で提案されたも
のは、図3に示すように、回転軸1に軸受2を介して軸
支された非磁性体の支持体3に、ヨーク用の支持リング
4を軸受5を介して回動自在に軸支し、この支持リング
4に複数の永久磁石6を互いに極性を逆向きにして周設
すると共に、これら永久磁石6群の外周面に対向するよ
うに、上記支持体3に互いに磁気的に絶縁した強磁性体
の複数のスイッチ板7を周設し、回転軸1に固着したロ
ータ8の円筒部8aの内周面を、所定の間隙を存して前
記スイッチ板7に対向せしめ、上記支持リング4を支持
体3に対して所定角度回動可能に構成したものである。
なお図3中の3aは支持体3の取付け部を示す。An example of an eddy current type speed reducer using this permanent magnet, which is proposed in Japanese Patent Application Laid-Open No. 1-298948, is axially supported by a rotary shaft 1 via a bearing 2 as shown in FIG. A support ring 4 for a yoke is rotatably supported by a non-magnetic support body 3 via a bearing 5, and a plurality of permanent magnets 6 are provided around the support ring 4 with their polarities being opposite to each other. In addition, a plurality of ferromagnetic switch plates 7 magnetically insulated from each other are provided around the support 3 so as to face the outer peripheral surfaces of the permanent magnets 6, and the rotor 8 fixed to the rotating shaft 1 is provided. The inner peripheral surface of the cylindrical portion 8a is opposed to the switch plate 7 with a predetermined gap, and the support ring 4 is rotatable with respect to the support 3 by a predetermined angle.
In addition, 3a in FIG. 3 shows a mounting portion of the support 3.
【0004】この特開平1−298948号で提案され
た渦電流式減速装置では、図4(a)に示すように、永
久磁石6がスイッチ板7と重なり合うように支持リング
4を回動させると、支持リング4と、隣接する永久磁石
6及び隣接するスイッチ板7と、ロータ8の円筒部8a
で、矢印で示すように磁気回路が形成されて、いわゆる
制動ON状態となり、前記した円筒部8aには永久磁石
6からの磁束が作用して渦電流が発生し、制動トルクが
発生する。In the eddy current type speed reducer proposed in Japanese Patent Application Laid-Open No. 1-298948, as shown in FIG. 4A, when the support ring 4 is rotated so that the permanent magnet 6 overlaps the switch plate 7. , The support ring 4, the adjacent permanent magnet 6 and the adjacent switch plate 7, and the cylindrical portion 8 a of the rotor 8.
Then, as shown by the arrow, a magnetic circuit is formed to bring about a so-called braking ON state, the magnetic flux from the permanent magnet 6 acts on the cylindrical portion 8a to generate an eddy current, and a braking torque is generated.
【0005】また、上記した制動ONの位置から支持リ
ング4を回し、図4(b)に示すように、一つの永久磁
石6が隣接するスイッチ板7を跨いで半分ずつ重なり合
った状態となすと、支持リング4と、隣接する永久磁石
6と、一つのスイッチ板7で、矢印で示すように短絡的
磁気回路が形成されて、いわゆる制動OFFの状態とな
る。Further, when the support ring 4 is turned from the above-mentioned braking ON position, as shown in FIG. 4 (b), one permanent magnet 6 is placed in a state where it is overlapped by half over the adjacent switch plate 7. The support ring 4, the adjacent permanent magnet 6 and the single switch plate 7 form a short-circuit magnetic circuit as shown by an arrow, which results in a so-called braking OFF state.
【0006】この状態では、前記した円筒部8aに渦電
流が流れず、制動トルクが発生しないのが理想である
が、現実には、図4(b)に破線で示す、永久磁石6上
でスイッチ板7に覆われない部分からの漏れ磁束がロー
タ8の円筒部8aに作用するため、円筒部8aに引きず
りトルクが発生するという問題が生じる。In this state, ideally, the eddy current does not flow in the cylindrical portion 8a and the braking torque is not generated, but in reality, on the permanent magnet 6 shown by the broken line in FIG. 4 (b). Since the leakage magnetic flux from the portion not covered by the switch plate 7 acts on the cylindrical portion 8a of the rotor 8, there arises a problem that drag torque is generated in the cylindrical portion 8a.
【0007】そこで、この引きずりトルクの発生を防止
するために、例えば特開平5−211761号、特開平
6−165477号、特開平6−189522号、特開
平6−86534号が提案されている。Therefore, in order to prevent the occurrence of the drag torque, for example, Japanese Patent Laid-Open Nos. 5-211761, 6-165477, 6-189522 and 6-86534 have been proposed.
【0008】例えば特開平5−211761号では、図
5に示すように、制動OFF時にスイッチ板に覆われな
い部分となる永久磁石6の周方向中央部分に開口部6a
を設けたり(図5(a))、また、周方向中央両側に切
欠き6bを設ける(図5(b))ことで、スイッチ板に
覆われない部分の永久磁石面積を縮小し、制動OFF
時、スイッチ板に覆われない部分からの漏れ磁束を低減
しようとしている。For example, in Japanese Unexamined Patent Publication No. 5-211761, as shown in FIG. 5, an opening 6a is formed at the central portion in the circumferential direction of the permanent magnet 6, which is a portion not covered by the switch plate when braking is off.
By providing (FIG. 5 (a)) or notches 6b on both sides in the center in the circumferential direction (FIG. 5 (b)), the area of the permanent magnet that is not covered by the switch plate is reduced, and the braking is turned off.
At times, we are trying to reduce the leakage flux from the part not covered by the switch plate.
【0009】また、特開平6−165477号では、図
6に示すように、制動OFF時にスイッチ板7に覆われ
ない部分となる永久磁石6の周方向中央部分に、極性が
逆の磁石9を設け、制動OFF時、永久磁石6と磁石9
とで短絡的磁気回路を形成させるようにしたものであ
る。Further, in Japanese Unexamined Patent Publication No. 6-165477, as shown in FIG. 6, a magnet 9 having a reverse polarity is provided at the central portion in the circumferential direction of the permanent magnet 6 which is a portion not covered by the switch plate 7 when the braking is turned off. Provided and when braking is off, permanent magnet 6 and magnet 9
A short circuit magnetic circuit is formed by and.
【0010】また、特開平6−189522号では、図
7に示すように、制動OFF時にスイッチ板に覆われな
い部分となる永久磁石6の周方向中央部分に凹部6cを
設けて、スイッチ板に覆われない部分の永久磁石体積を
縮小し、制動OFF時、スイッチ板に覆われない部分か
らの漏れ磁束を低減しようとしている。Further, in Japanese Unexamined Patent Publication No. 6-189522, as shown in FIG. 7, a concave portion 6c is provided in the central portion in the circumferential direction of the permanent magnet 6 which is a portion which is not covered by the switch plate when the braking is turned off. We are trying to reduce the volume of the permanent magnet in the uncovered area and reduce the leakage flux from the uncovered area when the braking is off.
【0011】また、特開平6−86534号では、図8
に示すように、各永久磁石6の外周面の周方向両端側
に、スイッチ板7の方向に突出する強磁性体からなる磁
極材10を設けることで、制動OFF時、スイッチ板7
に覆われない部分からの漏れ磁束を低減しようとしてい
る。Further, in Japanese Patent Laid-Open No. 6-86534, FIG.
As shown in FIG. 3, the magnetic pole material 10 made of a ferromagnetic material that protrudes in the direction of the switch plate 7 is provided on both ends of the outer peripheral surface of each permanent magnet 6 in the circumferential direction.
We are trying to reduce the magnetic flux leakage from the parts that are not covered by.
【0012】[0012]
【発明が解決しようとする課題】しかしながら、上記し
た特開平5−211761号、特開平6−165477
号、特開平6−189522号で提案されたものは、い
ずれも、制動OFF時にスイッチ板に覆われない部分と
なる、永久磁石における周方向中央部分の磁力を弱める
ものであるから、制動OFF時の漏れ磁束は低減できる
ものの、同時に制動ON時の制動トルクも低下するとい
う問題がある。However, the above-mentioned Japanese Patent Laid-Open Nos. 5-211761 and 6-165477 have been disclosed.
Japanese Patent Laid-Open No. 6-189522 and Japanese Patent Laid-Open No. 6-189522 weaken the magnetic force at the central portion in the circumferential direction of the permanent magnet, which is the portion not covered by the switch plate when braking is off. Although the leakage magnetic flux can be reduced, there is a problem that the braking torque at the time of braking ON is also reduced.
【0013】また、特開平6−86534号で提案され
たものでは、スイッチ板と永久磁石間の間隔が大きくな
るので、必然的に永久磁石とロータの円筒部との距離も
大きくなって、制動ON時にロータの円筒部に作用する
磁束密度が低減する。特に、永久磁石の周方向中央部
で、スイッチ板との間に空隙が形成されるので、永久磁
石の周方向中央部から生じる磁束の減衰が大きくなる結
果、制動ON時の制動トルクが低下するという問題があ
る。Further, in the one proposed in Japanese Patent Laid-Open No. 6-86534, the distance between the switch plate and the permanent magnet is increased, so that the distance between the permanent magnet and the cylindrical portion of the rotor is inevitably increased and the braking is performed. The magnetic flux density acting on the cylindrical portion of the rotor at the time of ON is reduced. In particular, since a gap is formed between the permanent magnet and the switch plate at the center in the circumferential direction, the attenuation of the magnetic flux generated from the center in the circumferential direction of the permanent magnet is increased, resulting in a decrease in the braking torque when the brake is turned on. There is a problem.
【0014】本発明は、上記した従来の問題点に鑑みて
なされたものであり、制動ON時の制動力を損なわない
で、制動OFF時に、隣接するスイッチ板からロータの
円筒部に漏れる磁束を抑え、引きずりトルクを抑制する
ことができる渦電流式減速装置を提供することを目的と
している。The present invention has been made in view of the above-mentioned conventional problems, and does not impair the braking force when the braking is turned on, and when the braking is turned off, the magnetic flux leaking from the adjacent switch plate to the cylindrical portion of the rotor is prevented. An object of the present invention is to provide an eddy current type speed reducer capable of suppressing and suppressing drag torque.
【0015】[0015]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の渦電流式減速装置は、永久磁石群が一
列に配置された渦電流式減速装置において、支持体部分
の内周面、外周面、または内部に強磁性体を配置するこ
ととしている。そして、この強磁性体によって、制動O
FF時、ロータの円筒部に漏れようとする磁束の流れを
スイッチ板の方向に変え、ロータの円筒部への磁気漏れ
を低減する。In order to achieve the above object, the eddy current type speed reducer of the present invention includes a permanent magnet group.
In an eddy current type speed reducer arranged in a row, a support part
The ferromagnetic material is arranged on the inner peripheral surface, the outer peripheral surface, or inside . And, by this ferromagnetic material, braking O
During FF, the flow of magnetic flux that tends to leak into the cylindrical portion of the rotor is changed to the direction of the switch plate, and the magnetic leakage into the cylindrical portion of the rotor is reduced.
【0016】[0016]
【発明の実施の形態】本発明の渦電流式減速装置は、回
転軸に一体的に取り付けられたロータと、このロータに
対向して支持され、ロータの周方向に沿って磁極の向き
を互いに逆向きとなるように、一列に一定の間隔を存し
て配置された永久磁石群と、この永久磁石群と前記ロー
タとの間に、前記永久磁石群の各永久磁石と同じ間隔を
存して介設された強磁性体のスイッチ板群と、このスイ
ッチ板群の各スイッチ板の間に介設された非磁性体の支
持体部分を備えた渦電流式減速装置において、前記支持
体部分の内周面、外周面、または内部に強磁性体を配置
し、制動OFF時に、前記永久磁石から生じる磁束が前
記強磁性体に入った後、該強磁性体に沿って円周方向に
曲がって前記スイッチ板に導かれるように構成したも
の、或いは、前記支持体部分の内周面、外周面、または
内部に小片で板状の強磁性体が備えられており、前記内
周面又は外周面の強磁性体は、当該強磁性体の板厚方向
に垂直な平面方向が、前記スイッチ板の内周面あるいは
外周面によって規定される周方向に沿って配置されたも
のである。BEST MODE FOR CARRYING OUT THE INVENTION An eddy current type speed reducer according to the present invention includes a rotor integrally attached to a rotating shaft, a rotor supported so as to face the rotor, and magnetic poles oriented along the circumferential direction of the rotor. A group of permanent magnets arranged in a row at regular intervals so as to be in the opposite direction, and the same spacing as each permanent magnet of the permanent magnet group exists between the permanent magnet group and the rotor. in eddy current reduction gear having a switch plate group interposed ferromagnetic material Te, a support portion of non-magnetic material interposed in each switch plates of the switch plate assembly, prior Ki支 bearing member portion A ferromagnetic material is placed on the inner surface, outer surface, or inside of the , and when braking is turned off, the magnetic flux generated from the permanent magnet
After entering the ferromagnetic material, in the circumferential direction along the ferromagnetic material
A structure configured to bend and be guided to the switch plate , or an inner peripheral surface, an outer peripheral surface of the support portion, or
Inside is a small piece of plate-shaped ferromagnetic material.
The ferromagnetic material on the peripheral surface or the outer peripheral surface is the thickness direction of the ferromagnetic material.
The plane direction perpendicular to is the inner peripheral surface of the switch plate or
Also arranged along the circumferential direction defined by the outer peripheral surface
Of .
【0017】本発明の渦電流式減速装置において、隣接
するスイッチ板間の支持体部分に配置する強磁性体の設
置位置は、支持体部分の内周面に限らず、外周面であっ
ても、また、支持体部分の内部であっても良い。また、
本発明の渦電流式減速装置は、ドラムタイプのものに限
らず、ディスクタイプのものも含まれる。そして、ディ
スクタイプのものには、永久磁石群の両側をディスクで
挟むものに限らず、一枚のディスクの両側を永久磁石群
で挟むものも含まれる。In the eddy current type speed reducer of the present invention, the installation position of the ferromagnetic material disposed in the support portion between the adjacent switch plates is not limited to the inner peripheral surface of the support portion, but may be the outer peripheral surface. Alternatively, it may be inside the support portion. Also,
The eddy current type speed reducer of the present invention is not limited to the drum type, and includes a disc type. The disk type includes not only those in which both sides of the permanent magnet group are sandwiched by the disks, but also those in which both sides of one disk are sandwiched by the permanent magnet groups.
【0018】本発明の渦電流式減速装置では、スイッチ
板と永久磁石が重なり合うと、支持リングと、隣接する
永久磁石及び隣接するスイッチ板と、ロータの円筒部で
磁気回路が構成されて、いわゆる制動ON状態となり、
前記した円筒部には永久磁石からの磁束が作用して渦電
流が発生し、制動トルクが発生する。In the eddy current type speed reducer of the present invention, when the switch plate and the permanent magnet are overlapped with each other, the support ring, the adjacent permanent magnet and the adjacent switch plate, and the cylindrical portion of the rotor constitute a magnetic circuit, which is so-called. Braking is turned on,
A magnetic flux from a permanent magnet acts on the cylindrical portion to generate an eddy current, and a braking torque is generated.
【0019】また、上記した制動ONの位置から、一つ
の永久磁石が、隣接するスイッチ板を跨いで半分ずつ重
なり合った状態となすと、支持リングと、隣接する永久
磁石と、これら永久磁石を跨いだスイッチ板で短絡磁気
回路が構成されて、いわゆる制動OFFの状態となる。
この時、スイッチ板に覆われない永久磁石部から生じる
磁束は、前記支持体部分に配置した強磁性体に入った
後、強磁性体に沿って円周方向に曲ってスイッチ板に導
かれるので、ロータの円筒部への磁気漏れは大幅に抑制
される。Further, when one permanent magnet is placed in a state of being half-overlapped over the adjacent switch plates from the above braking ON position, the support ring, the adjacent permanent magnets, and these permanent magnets are crossed over. The switch plate constitutes a short-circuit magnetic circuit, and the so-called braking is turned off.
At this time, since the magnetic flux generated from the permanent magnet portion not covered by the switch plate enters the ferromagnetic body arranged in the support portion, is bent in the circumferential direction along the ferromagnetic body and is guided to the switch plate. Magnetic leakage to the cylindrical portion of the rotor is significantly suppressed.
【0020】[0020]
【実施例】以下、本発明の渦電流式減速装置を図1及び
図2に示す実施例に基づいて説明する。なお、図1及び
図2中、図3〜図8と同一符号は同一部分或いは相当部
分を示し、詳細な説明を省略する。図1は本発明の渦電
流式減速装置の説明図で、左半分は制動ONの状態の磁
気回路構成を示す説明図、右半分は制動OFFの状態の
短絡磁気回路構成を示す説明図、図2は本発明の渦電流
式減速装置の説明図の他の実施例の説明図で、制動OF
Fの状態の短絡磁気回路構成を示す説明図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current type speed reducer of the present invention will be described below with reference to the embodiments shown in FIGS. 1 and 2, the same reference numerals as those in Figs. 3 to 8 indicate the same or corresponding portions, and detailed description thereof will be omitted. FIG. 1 is an explanatory diagram of an eddy current type speed reducer of the present invention. The left half is an explanatory diagram showing a magnetic circuit configuration in a braking ON state, and the right half is an explanatory diagram showing a short circuit magnetic circuit configuration in a braking OFF state. Reference numeral 2 is an explanatory view of another embodiment of the explanatory view of the eddy current type speed reducer of the present invention.
It is explanatory drawing which shows the short circuit magnetic circuit structure of the state of F.
【0021】図1において、11は例えば低炭素鋼から
なる強磁性体であり、回転軸(1)に軸受(2)を介し
て回動自在に軸支された支持体3における、互いに磁気
的に絶縁した状態で周設した強磁性体のスイッチ板7間
の支持体3部分の内周面に、例えば接着によって取り付
けられる。In FIG. 1, reference numeral 11 is a ferromagnetic material made of, for example, low carbon steel, and magnetic materials are mutually magnetic in a support 3 rotatably supported by a rotating shaft (1) through a bearing (2). It is attached to the inner peripheral surface of the support 3 portion between the ferromagnetic switch plates 7 which are provided in an insulated state, for example, by adhesion.
【0022】このような図1に示した渦電流式減速装置
では、支持リング4を回動させて、図1の左半分に示す
ように、永久磁石6がスイッチ板7と重なり合うと、支
持リング4と、隣接する永久磁石6及び隣接するスイッ
チ板7と、ロータ(8)の円筒部8aで磁気回路が形成
されて、いわゆる制動ON状態となり、回転する前記円
筒部8aが永久磁石6からの磁界を横切る時に、円筒部
8aに生じる渦電流と磁界の作用により、円筒部8aに
制動トルクが発生する。In such an eddy current type speed reducer shown in FIG. 1, when the support ring 4 is rotated and the permanent magnet 6 overlaps with the switch plate 7 as shown in the left half of FIG. 4, the adjacent permanent magnet 6 and the adjacent switch plate 7, and the cylindrical portion 8a of the rotor (8) form a magnetic circuit, so that a so-called braking ON state is established, and the rotating cylindrical portion 8a is separated from the permanent magnet 6. A braking torque is generated in the cylindrical portion 8a by the action of the eddy current and the magnetic field generated in the cylindrical portion 8a when traversing the magnetic field.
【0023】また、上記した制動ONの位置から、支持
リング4を回動させて永久磁石6列を磁石の半配列ピッ
チ分だけ旋回させる。この状態では、図1の右半分に示
すように、一つの永久磁石6が、隣接するスイッチ板7
を跨いで半分ずつ重なった状態となって、支持リング4
と、隣接する永久磁石6及びスイッチ板7で短絡磁気回
路が形成されて、いわゆる制動OFFの状態となる。Further, from the above-mentioned braking ON position, the support ring 4 is rotated to rotate the row of permanent magnets 6 by the half arrangement pitch of the magnets. In this state, as shown in the right half of FIG.
And the support ring 4
Then, a short-circuit magnetic circuit is formed by the adjacent permanent magnet 6 and the switch plate 7, and a so-called braking OFF state is set.
【0024】この時、磁束は透過し易い物質内を選択的
に透過する性質を有することから、スイッチ板7に覆わ
れない永久磁石6部から生じる磁束は、対向する非磁性
体の支持体3部分に取り付けた強磁性体11に垂直に入
った後、強磁性体11に沿って円周方向に曲ってスイッ
チ板7に導かれる。従って、ロータ(8)の円筒部8a
への漏れ磁束が減少し、前記した円筒部8aに発生する
制動トルクは大幅に減少して、引きずりトルクが低減す
る。At this time, since the magnetic flux has a property of selectively permeating the inside of a substance that easily permeates, the magnetic flux generated from the permanent magnet 6 portion not covered by the switch plate 7 opposes the supporting body 3 of the non-magnetic body. After entering perpendicularly to the ferromagnetic body 11 attached to the part, it is bent in the circumferential direction along the ferromagnetic body 11 and guided to the switch plate 7. Therefore, the cylindrical portion 8a of the rotor (8)
The leakage magnetic flux to the cylinder portion 8a is reduced, the braking torque generated in the cylindrical portion 8a is significantly reduced, and the drag torque is reduced.
【0025】ちなみに、本発明の効果を確認するため
に、図1に示したように、スイッチ板間の支持体部分の
内周面に低炭素鋼からなる強磁性体を接着した渦電流式
減速装置を、大型トラックのトランスミッション後部の
プロペラシャフトの途中に装備して、制動ON時の制動
トルクと、制動OFF時の引きずりトルクを測定した。Incidentally, in order to confirm the effect of the present invention, as shown in FIG. 1, an eddy current type deceleration in which a ferromagnetic material made of low carbon steel is adhered to the inner peripheral surface of the support portion between the switch plates. The device was installed in the middle of the propeller shaft at the rear of the transmission of a large truck, and the braking torque when braking was turned on and the drag torque when braking was turned off were measured.
【0026】試験に供した渦電流式減速装置のロータの
円筒部はCr−Mo系の低合金鋼からなり、内径は約3
80mm、肉厚は約20mm、軸方向長さは約80mm
であった。また、比較として、スイッチ板間の支持体部
分に強磁性体を取り付けていない従来の渦電流式減速装
置(従来例) と、図5(a)に示した、周方向中央部
に、周方向長さの1/4、幅方向長さの2/3の開口部
を形成した永久磁石を設けた渦電流式減速装置(比較
例)も同時に試験に供した。The cylindrical portion of the rotor of the eddy current type speed reducer used in the test is made of Cr-Mo low alloy steel and has an inner diameter of about 3 mm.
80mm, wall thickness is about 20mm, axial length is about 80mm
Met. For comparison, a conventional eddy current type speed reducer (conventional example) in which a ferromagnetic material is not attached to the support portion between the switch plates and the circumferential center portion shown in FIG. An eddy current type speed reducer (comparative example) provided with a permanent magnet having an opening of 1/4 of the length and 2/3 of the length in the width direction was also subjected to the test at the same time.
【0027】制動トルクと引きずりトルクは、図3に示
す回転軸を連結しているプロペラシャフトの回転速度が
500、1000、1500、2000rpmの時点
で、制動のON,OFFを切換えて測定した。その測定
結果を下記表1に示す。The braking torque and the drag torque were measured by switching the braking ON and OFF when the rotation speed of the propeller shaft connecting the rotating shafts shown in FIG. 3 was 500, 1000, 1500 and 2000 rpm. The measurement results are shown in Table 1 below.
【0028】[0028]
【表1】 [Table 1]
【0029】表1より明らかなように、本発明例では従
来例と比べて、制動トルクはほぼ同じであるが、引きず
りトルクは大幅に減少している。つまり、永久磁石と対
向する側のスイッチ板間の支持体部分に強磁性体を取り
付けることで、制動ON時の制動力を損なわないで、制
動OFF時の引きずりトルクを大幅に減少することがで
きることが判る。一方、比較例では、従来例と比べて引
きずりトルクは低減できるものの、同時に制動ON時の
制動トルクも減少している。As is apparent from Table 1, the braking torque of the present invention is substantially the same as that of the conventional example, but the drag torque is greatly reduced. That is, by attaching a ferromagnetic material to the support portion between the switch plates on the side facing the permanent magnet, it is possible to significantly reduce the drag torque when the braking is turned off without impairing the braking force when the braking is turned on. I understand. On the other hand, in the comparative example, the drag torque can be reduced as compared with the conventional example, but at the same time, the braking torque when the braking is turned on is also reduced.
【0030】図1に示した実施例では、スイッチ板7間
の支持体3部分の内周面に強磁性体11を取り付けたも
のを示しているが、図2に示すように、支持体3部分の
外周面や、支持体3部分の内部に取り付けても同様な効
果が得られることは言うまでもない。また、本実施例で
は、強磁性体11として低炭素鋼を示したが、強磁性体
11であれば、低炭素鋼に限らないことは言うまでもな
い。In the embodiment shown in FIG. 1, the ferromagnetic material 11 is attached to the inner peripheral surface of the support 3 portion between the switch plates 7, but as shown in FIG. It goes without saying that the same effect can be obtained by attaching the outer peripheral surface of the portion or the inside of the support body 3 portion. Further, in this embodiment, the low-carbon steel is shown as the ferromagnetic body 11, but it goes without saying that the ferromagnetic body 11 is not limited to the low-carbon steel.
【0031】また、取付方法も、支持体3に強磁性体1
1を取り付けられるものであれば、接着に限らず、ビス
止めなどであっても良い。また、本実施例では、ポール
ピースを省略したものを示しているが、永久磁石6の外
周にポールピースを取付けたものであっても良い。The mounting method is also such that the ferromagnetic material 1 is attached to the support body 3.
As long as 1 can be attached, it is not limited to adhesion, and screws or the like may be used. Further, in the present embodiment, the pole piece is omitted, but the pole piece may be attached to the outer circumference of the permanent magnet 6.
【0032】なお、図1及び図2に示す実施例では、ド
ラムタイプの渦電流式減速装置に適用したものを示した
が、本発明の渦電流式減速装置は、例えば特開平1−2
98947号で提案されているような、ディスクタイプ
の渦電流式減速装置にも適用できることは言うまでもな
い。そして、ディスクタイプも、永久磁石群の両側をデ
ィスクで挟むものに限らず、一枚のディスクの両側を永
久磁石群で挟むものでも良い。Although the embodiment shown in FIGS. 1 and 2 is applied to the drum type eddy current type speed reducer, the eddy current type speed reducer of the present invention is disclosed in, for example, Japanese Patent Laid-Open No. 1-22.
It goes without saying that the present invention can also be applied to a disk type eddy current type speed reducer as proposed in Japanese Patent No. 98947. Further, the disc type is not limited to one in which both sides of the permanent magnet group are sandwiched by the disks, and one in which both sides of one disc are sandwiched by the permanent magnet groups may be used.
【0033】[0033]
【発明の効果】以上説明したように、本発明の渦電流式
減速装置によれば、制動OFF時、スイッチ板に覆われ
ない永久磁石部から生じる磁束は、支持体部分に配置し
た強磁性体に入った後、強磁性体に沿って円周方向に曲
ってスイッチ板に導かれるので、ロータの円筒部への磁
気漏れを大幅に抑制できる。従って、制動OFF時、ロ
ータの円筒部に制動トルクが抑制でき、その結果、引き
ずりトルクが低減して、非制動時の動力損失を抑制する
ことができる。As described above, according to the eddy current type speed reducer of the present invention, the magnetic flux generated from the permanent magnet portion which is not covered by the switch plate when the braking is turned off is a ferromagnetic material arranged in the support portion. After entering, it is bent in the circumferential direction along the ferromagnetic material and guided to the switch plate, so that magnetic leakage to the cylindrical portion of the rotor can be greatly suppressed. Therefore, when the braking is off, the braking torque can be suppressed in the cylindrical portion of the rotor, as a result, the drag torque is reduced, and the power loss during non-braking can be suppressed.
【図1】本発明の渦電流式減速装置の説明図で、左半分
は制動ONの状態の磁気回路構成を示す説明図、右半分
は制動OFFの状態の短絡磁気回路構成を示す説明図で
ある。FIG. 1 is an explanatory view of an eddy current type speed reducer of the present invention, the left half is an explanatory view showing a magnetic circuit configuration in a braking ON state, and the right half is an explanatory view showing a short-circuit magnetic circuit configuration in a braking OFF state. is there.
【図2】本発明の渦電流式減速装置の説明図の他の実施
例の説明図で、制動OFFの状態の短絡磁気回路構成を
示す説明図である。FIG. 2 is an explanatory view of another embodiment of the explanatory view of the eddy current type speed reducer of the present invention, and is an explanatory view showing a short-circuit magnetic circuit configuration in a braking OFF state.
【図3】特開平1−298948号で提案された渦電流
式減速装置の側面図で、上半分を断面して示した図であ
る。FIG. 3 is a side view of an eddy current type speed reducer proposed in Japanese Patent Application Laid-Open No. 1-298948, showing an upper half in section.
【図4】図3の渦電流式減速装置における磁気回路構成
を示す説明図で、(a)は制動ONの状態、(b)は制
動OFFの状態を示す図である。4A and 4B are explanatory diagrams showing a magnetic circuit configuration in the eddy current type speed reducer shown in FIG. 3, in which FIG. 4A is a braking ON state and FIG. 4B is a braking OFF state.
【図5】(a)(b)は共に特開平5−211761号
で提案された永久磁石の形状を説明する斜視図である。5A and 5B are perspective views for explaining the shape of a permanent magnet proposed in Japanese Patent Laid-Open No. 5-211761.
【図6】特開平6−165477号で提案された渦電流
式減速装置における制動OFF時の短絡磁気回路構成を
示す説明図である。FIG. 6 is an explanatory diagram showing a short-circuit magnetic circuit configuration when braking is off in the eddy current type speed reducer proposed in JP-A-6-165477.
【図7】特開平6−189522号で提案された永久磁
石の形状を説明する断面図である。FIG. 7 is a cross-sectional view illustrating the shape of a permanent magnet proposed in Japanese Patent Laid-Open No. 6-189522.
【図8】特開平6−86534号で提案された渦電流式
減速装置における制動OFF時の短絡磁気回路構成を示
す説明図である。FIG. 8 is an explanatory diagram showing a short-circuit magnetic circuit configuration when braking is off in the eddy current type speed reducer proposed in Japanese Patent Laid-Open No. 6-86534.
1 回転軸 3 支持体 4 支持リング 6 永久磁石 7 スイッチ板 8 ロータ 8a 円筒部 11 強磁性体 1 rotation axis 3 support 4 Support ring 6 permanent magnet 7 switch board 8 rotor 8a cylindrical part 11 Ferromagnet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石田 昭佳 大阪府大阪市此花区島屋5丁目1番109 号 住友金属工業株式会社関西製造所製 鋼品事業所内 (72)発明者 山口 働 大阪府大阪市此花区島屋5丁目1番109 号 住友金属工業株式会社関西製造所製 鋼品事業所内 (56)参考文献 実開 平7−27291(JP,U) (58)調査した分野(Int.Cl.7,DB名) H02K 49/02,49/10 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akika Ishida Osaka Prefecture Osaka City 5-1-1 Shimaya, Konohana-ku Osaka Sumitomo Metal Industries, Ltd. Kansai Works Steel Works (72) Inventor Yamaguchi Works Osaka 5-109 Shimaya, Konohana-ku, Osaka City Sumitomo Metal Industries, Ltd. Kansai Works Steel Works (56) Bibliography 7-27291 (JP, U) (58) Fields investigated (Int.Cl . 7 , DB name) H02K 49 / 02,49 / 10
Claims (2)
と、このロータに対向して支持され、ロータの周方向に
沿って磁極の向きを互いに逆向きとなるように、一列に
一定の間隔を存して配置された永久磁石群と、この永久
磁石群と前記ロータとの間に、前記永久磁石群の各永久
磁石と同じ間隔を存して介設された強磁性体のスイッチ
板群と、このスイッチ板群の各スイッチ板の間に介設さ
れた非磁性体の支持体部分を備えた渦電流式減速装置に
おいて、 前記支持体部分の内周面、外周面、または内部に強磁性
体を配置し、制動OFF時に、前記永久磁石から生じる
磁束が前記強磁性体に入った後、該強磁性体に沿って円
周方向に曲がって前記スイッチ板に導かれるように構成
したことを特徴とする渦電流式減速装置。[1 claim: a rotor that is integrally attached to the rotary shaft is supported to face the rotor, so that the opposite directions the pole orientation along the circumferential direction of the rotor, in a row <br / > A group of permanent magnets arranged with a constant space, and a ferromagnetic body interposed between the permanent magnet group and the rotor at the same intervals as the permanent magnets of the permanent magnet group. and switch plate assembly, the eddy current type reduction gear comprising a carrier part of the non-magnetic material interposed in each switch plates of the switch plate assembly, the inner circumferential surface of the front Ki支 bearing member portion, the outer peripheral surface, Or , a ferromagnetic material is placed inside , and when braking is turned off, it is generated from the permanent magnet.
After the magnetic flux enters the ferromagnetic material, a circle is drawn along the ferromagnetic material.
It is configured to bend in the circumferential direction and be guided to the switch plate.
The eddy current type speed reducer characterized in that
と、このロータに対向して支持され、ロータの周方向にAnd is supported opposite to this rotor, and is supported in the circumferential direction of the rotor.
沿って磁極の向きを互いに逆向きとなるように、一列にAlong the lines so that the magnetic poles are in opposite directions.
一定の間隔を存して配置された永久磁石群と、この永久A group of permanent magnets arranged at regular intervals and this permanent magnet
磁石群と前記ロータとの間に、前記永久磁石群の各永久Between the magnet group and the rotor, each permanent magnet of the permanent magnet group is
磁石と同じ間隔を存して介設された強磁性体のスイッチFerromagnetic switch placed at the same distance as the magnet
板群と、このスイッチ板群の各スイッチ板の間に介設さIt is installed between the plate group and each switch plate of this switch plate group.
れた非磁性体の支持体部分を備えた渦電流式減速装置にEddy current reducer with a non-magnetic support
おいて、Be careful 前記支持体部分の内周面、外周面、または内部に小片でA small piece on the inner surface, outer surface, or inside of the support part
板状の強磁性体が備えられており、前記内周面又は外周A plate-shaped ferromagnetic material is provided, and the inner peripheral surface or the outer peripheral surface is provided.
面の強磁性体は、当該強磁性体の板厚方向に垂直な平面The ferromagnetic material of the plane is a plane perpendicular to the thickness direction of the ferromagnetic material.
方向が、前記スイッチ板の内周面あるいは外周面によっDepending on the inner or outer surface of the switch plate.
て規定される周方向に沿って配置されることを特徴とすAre arranged along the circumferential direction defined by
る渦電流式減速装置。Eddy current type speed reducer.
Priority Applications (1)
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JP27772198A JP3484992B2 (en) | 1998-09-30 | 1998-09-30 | Eddy current speed reducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27772198A JP3484992B2 (en) | 1998-09-30 | 1998-09-30 | Eddy current speed reducer |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000116106A JP2000116106A (en) | 2000-04-21 |
JP3484992B2 true JP3484992B2 (en) | 2004-01-06 |
Family
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JP27772198A Expired - Fee Related JP3484992B2 (en) | 1998-09-30 | 1998-09-30 | Eddy current speed reducer |
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JP5569407B2 (en) * | 2011-01-20 | 2014-08-13 | 新日鐵住金株式会社 | Eddy current reducer |
US20180035493A1 (en) * | 2015-02-24 | 2018-02-01 | Nippon Steel & Sumitomo Metal Corporation | Eddy current heat generating apparatus |
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