JP2001078425A - Eddy curent decelerator - Google Patents
Eddy curent deceleratorInfo
- Publication number
- JP2001078425A JP2001078425A JP25081499A JP25081499A JP2001078425A JP 2001078425 A JP2001078425 A JP 2001078425A JP 25081499 A JP25081499 A JP 25081499A JP 25081499 A JP25081499 A JP 25081499A JP 2001078425 A JP2001078425 A JP 2001078425A
- Authority
- JP
- Japan
- Prior art keywords
- braking
- ferromagnetic plate
- magnet
- guide cylinder
- magnets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は大型車両などの摩擦
ブレーキを補助する渦電流減速装置、特に磁石支持筒の
磁石からの磁界を効率的に制動ドラムまたは制動円板へ
導き、制動能力を高めるようにした渦電流減速装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current reduction device for assisting a friction brake of a large vehicle or the like, and more particularly, to efficiently guide a magnetic field from a magnet of a magnet support cylinder to a braking drum or a braking disk to enhance a braking capability. The present invention relates to an eddy current reduction device as described above.
【０００２】[0002]
【従来の技術】回転する導体からなる制動ドラムまたは
制動円板に対向して非磁性体からなる案内筒を配置し、
案内筒の内空部に収容した磁石支持筒の磁石（電磁石を
含む）からの磁界を、回転する制動ドラムまたは制動円
板が横切る時、制動ドラムまたは制動ドラムに制動トル
クを発生させる渦電流減速装置では、磁石支持筒の磁石
を泥水などから保護するために、磁石支持筒が案内筒の
内部に収容されている。案内筒の制動ドラムまたは制動
円板に対向する壁部には、磁石の磁界が制動ドラムまた
は制動円板へ到達するように、多数の強磁性板が周方向
等間隔に配設される。2. Description of the Related Art A guide cylinder made of a non-magnetic material is arranged opposite a braking drum or a braking disk made of a rotating conductor.
Eddy current deceleration that generates a braking torque on the braking drum or the braking drum when a rotating braking drum or braking disk crosses a magnetic field from a magnet (including an electromagnet) of the magnet supporting cylinder housed in the inner space of the guide cylinder. In the device, the magnet support tube is housed inside the guide tube in order to protect the magnet of the magnet support tube from muddy water or the like. A large number of ferromagnetic plates are arranged at equal intervals in the circumferential direction on the wall of the guide cylinder facing the brake drum or the brake disk so that the magnetic field of the magnet reaches the brake drum or the brake disk.
【０００３】従来の渦電流減速装置では、磁石支持筒の
磁石からの磁界が制動ドラムへ効率的に到達するよう
に、かつ渦電流による制動ドラムの過熱を抑えるために
種々の手段が講じられている。例えば、特開平１０−２
４３６２７号公報に開示される渦電流減速装置では、制
動ドラムの両端壁部に銅などの良伝導体からなる環状体
を結合することにより、制動ドラムの内部に発生する渦
電流を軸方向に広めることにより、制動ドラムの冷却性
を高め、同時に制動能力を高めるようにしている。しか
し、上述の制動ドラムの両端部に良伝導体からなる環状
体を結合した渦電流減速装置では、制動ドラムに対する
銅などの良伝導体からなる環状体を接合するのに次のよ
うな問題がある。[0003] In the conventional eddy current reduction device, various measures are taken so that the magnetic field from the magnet of the magnet support cylinder can efficiently reach the brake drum and suppress overheating of the brake drum due to the eddy current. I have. For example, JP-A-10-2
In the eddy current reduction device disclosed in Japanese Patent No. 43627, an annular body made of a good conductor such as copper is connected to both end walls of the braking drum, so that the eddy current generated inside the braking drum is spread in the axial direction. Thereby, the cooling performance of the braking drum is enhanced, and at the same time, the braking capacity is enhanced. However, in the eddy current reduction device in which the annular body made of a good conductor is connected to both ends of the above-described braking drum, the following problem occurs in joining the annular body made of a good conductor such as copper to the braking drum. is there.
【０００４】（ａ） 制動能力の向上を図るために、制
動ドラムに接合する環状体の軸方向寸法がかなり大きく
なり、つまり環状体の銅量が多くなるので材料費が嵩
む。(A) In order to improve the braking capacity, the axial dimension of the annular body joined to the braking drum becomes considerably large, that is, the amount of copper in the annular body increases, so that the material cost increases.
【０００５】（ｂ） 環状体の軸方向寸法が、制動ドラ
ムの開放端部ないし先端部と基端部とでは異なるため
に、制動ドラムに発生する渦電流による熱の分布が不均
一になり、制動ドラムの冷却性を阻害し、制動能力の向
上にはあまり役立たない。(B) Since the axial dimension of the annular body is different between the open end or the front end and the base end of the brake drum, the distribution of heat due to eddy current generated in the brake drum becomes uneven. It hinders the cooling performance of the braking drum and is not very useful for improving braking performance.
【０００６】[0006]
【発明が解決しようとする課題】本発明の課題は上述の
問題に鑑み、強磁性板の形状について内面の軸方向寸法
よりも外面の軸方面寸法を大きくすることにより、磁石
支持筒の磁石から強磁性板を経て制動ドラムへ達する磁
界の洩れを抑制し、制動能力を向上し、強磁性板の厚さ
を薄くできるようにした渦電流減速装置を提供すること
にある。SUMMARY OF THE INVENTION In view of the above-mentioned problems, the object of the present invention is to make the shape of a ferromagnetic plate larger in the axial direction on the outer surface than in the axial direction on the inner surface, thereby reducing the size of the magnet in the magnet support cylinder. It is an object of the present invention to provide an eddy current reduction device that suppresses leakage of a magnetic field reaching a braking drum via a ferromagnetic plate, improves a braking capability, and can reduce the thickness of the ferromagnetic plate.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、本発明の構成は車体などの非回転部分に取り付けら
れ断面長方形の内空部を有する非磁性体からなる案内筒
と、該案内筒の内空部に収容した少くとも一方が可動の
磁石支持筒と、該磁石支持筒の外周壁に周方向等間隔に
結合した多数の磁石と、前記案内筒の前記各磁石と対向
する部分に鋳込んだ強磁性板と、前記案内筒を覆うよう
に回転軸に結合されかつ前記強磁性板と対向しない内周
面の両端部に銅などの良伝導体からなる環状体を具備す
る制動ドラムとを有し、前記磁石からの磁界により渦電
流に基づく制動力を前記制動ドラムに発生させる渦電流
減速装置において、前記強磁性板の外面の両端縁を前記
制動ドラムと前記環状体との境界に合わせ、前記強磁性
板の内面の両端縁を前記磁石の外面の端縁に合わせたこ
とを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a configuration of the present invention is a guide tube made of a non-magnetic material having a rectangular hollow section and attached to a non-rotating portion such as a vehicle body. At least one of the magnet support tubes housed in the inner space of the tube, at least one of which is movable, a large number of magnets coupled to the outer peripheral wall of the magnet support tube at equal circumferential intervals, and a portion of the guide tube facing each of the magnets A ferromagnetic plate cast into a cylinder and a ring body made of a good conductor such as copper at both ends of an inner peripheral surface which is coupled to the rotating shaft so as to cover the guide cylinder and does not face the ferromagnetic plate. An eddy current reduction device having a drum and generating a braking force based on an eddy current by a magnetic field from the magnet in the braking drum, wherein both end edges of an outer surface of the ferromagnetic plate are formed by the braking drum and the annular body. Align both edges of the inner surface of the ferromagnetic plate with the boundary Wherein the tailored to the edge of the outer surface of the magnet.
【０００８】また、本発明の構成は車体などの非回転部
分に取り付けられ断面長方形の内空部を有する非磁性体
からなる案内筒と、該案内筒の内空部に収容した少くと
も一方が可動の磁石支持筒と、該磁石支持筒に周方向等
間隔に結合した多数の磁石と、前記案内筒の両端壁の前
記各磁石と対向する部分に鋳込んだ強磁性板と、前記案
内筒の両端壁に対向するよう回転軸に結合されかつ前記
強磁性板と対向しない内外周縁に銅などの良伝導体から
なる環状体を具備する１対の制動円板とを有し、前記磁
石からの磁界により渦電流に基づく制動力を前記制動円
板に発生させる渦電流減速装置において、前記強磁性板
の外面の内外周縁を前記制動円板と前記環状体との境界
に合わせ、前記強磁性板の内面の内外周縁を前記磁石の
内外周縁に合わせたことを特徴とする。Further, according to the structure of the present invention, a guide cylinder made of a non-magnetic material having an inner space with a rectangular cross section attached to a non-rotating portion such as a vehicle body, and at least one accommodated in the inner space of the guide tube is provided. A movable magnet support cylinder, a large number of magnets coupled to the magnet support cylinder at equal intervals in the circumferential direction, a ferromagnetic plate cast in portions of both end walls of the guide cylinder facing the respective magnets, and the guide cylinder A pair of braking disks each having an annular body made of a good conductor such as copper on inner and outer peripheral edges not coupled to the ferromagnetic plate and coupled to the rotating shaft so as to face both end walls of the magnet. An eddy current reduction device that generates a braking force based on an eddy current on the braking disk by the magnetic field of the ferromagnetic plate, wherein an inner and outer peripheral edge of an outer surface of the ferromagnetic plate is aligned with a boundary between the braking disk and the annular body, Align the inner and outer edges of the inner surface of the plate with the inner and outer edges of the magnet It is characterized in.
【０００９】[0009]
【発明の実施の形態】本発明では案内筒の外筒部に周方
向等間隔に配設される多数の強磁性板について、強磁性
板の外面の両端縁を制動ドラムと環状体との境界に合わ
せ、強磁性板の内面の両端縁を磁石の外面の端縁に合わ
せる。換言すれば、強磁性板の外面の軸方向寸法を、制
動ドラムの環状体の間隔と等しくし、強磁性板の磁石と
対向する内面の軸方向寸法を、磁石の外面の軸方向寸法
と等しくする。また、本発明では案内筒の両端壁に周方
向等間隔に配設される多数の強磁性板について、強磁性
板の外面の内外周縁を制動円板と環状体との境界に合わ
せ、強磁性板の内面の内外周縁を磁石の内外周縁に合わ
せる。換言すれば、強磁性板の外面の径方向寸法を、制
動円板の内外周縁に結合した環状体の間隔と等しくし、
強磁性板の磁石と対向する内面の径方向寸法を、磁石の
径方向寸法と等しくする。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, with respect to a large number of ferromagnetic plates arranged at equal intervals in the circumferential direction on an outer cylinder portion of a guide cylinder, both end edges of the outer surface of the ferromagnetic plate are defined by a boundary between a braking drum and an annular body. , The edges of the inner surface of the ferromagnetic plate are aligned with the edges of the outer surface of the magnet. In other words, the axial dimension of the outer surface of the ferromagnetic plate is equal to the distance between the annular bodies of the braking drum, and the axial dimension of the inner surface of the ferromagnetic plate facing the magnet is equal to the axial dimension of the outer surface of the magnet. I do. Further, in the present invention, with respect to a large number of ferromagnetic plates disposed at equal intervals in the circumferential direction on both end walls of the guide cylinder, the inner and outer peripheral edges of the outer surface of the ferromagnetic plate are aligned with the boundary between the braking disk and the annular body, The inner and outer edges of the inner surface of the plate are aligned with the inner and outer edges of the magnet. In other words, the radial dimension of the outer surface of the ferromagnetic plate is equal to the interval between the annular bodies coupled to the inner and outer peripheral edges of the braking disk,
The radial dimension of the inner surface of the ferromagnetic plate facing the magnet is made equal to the radial dimension of the magnet.
【００１０】磁石から強磁性板を経て制動ドラムまたは
制動円板へ到達する磁界が、軸方向または径外方へ広め
られるので、制動ドラムまたは制動円板へ到達しない磁
気洩れが殆どなくなり、また渦電流の分布が制動ドラム
の軸方向または制動円板の径方向へ広められるので、渦
電流による熱の放散が促進され、制動能力が高められ
る。また、非制動時、案内筒に配設した強磁性板と磁石
支持筒との間に形成される短絡的磁気回路が軸方向に広
がるので、強磁性板における磁束密度が小さくなり、磁
気洩れによる引きずりトルクが抑えられ、強磁性板を薄
くしても差し支えない。制動ドラムの両端または制動円
板の内外周縁の環状体の軸方向間隔または径方向間隔を
広げることにより、環状体に要する銅量が少くなる。The magnetic field reaching the brake drum or the brake disk from the magnet via the ferromagnetic plate is spread axially or radially outward, so that there is almost no magnetic leakage that does not reach the brake drum or the brake disk, Since the current distribution is spread in the axial direction of the braking drum or in the radial direction of the braking disk, the dissipation of heat by eddy currents is promoted, and the braking ability is enhanced. In addition, at the time of non-braking, the short-circuit magnetic circuit formed between the ferromagnetic plate disposed on the guide cylinder and the magnet support cylinder spreads in the axial direction, so that the magnetic flux density in the ferromagnetic plate decreases and magnetic leakage occurs. The drag torque is suppressed, and the ferromagnetic plate can be made thinner. By increasing the axial or radial spacing of the annular body at both ends of the braking drum or at the inner and outer peripheral edges of the braking disk, the amount of copper required for the annular body is reduced.
【００１１】[0011]
【実施例】渦電流減速装置は図１に示す導体からなる制
動ドラム２と、図２に示す非磁性体からなる不動の案内
筒１２と、案内筒１２の内部に収容される可動の磁石支
持筒２３と不動の磁石支持筒１３とから構成される。制
動ドラム２の外周面には周方向等間隔に多数の冷却フイ
ン２ａが備えられ、図３に示すように、制動ドラム２と
冷却フイン２ａの両端壁には、銅などの良伝導体からな
る環状体７，７ａと環状体８，８ａが結合され、制動ド
ラム２の基端部の環状体８に、複数の支持腕３の先端部
が溶接などにより結合される。しかし、支持腕３の先端
部を左方へ折り曲げたうえ、制動ドラム２の基端壁に直
接溶接するようにしてもよい。断面長方形の内空部を有
する案内筒１２が、制動ドラム２の内部に臨むように車
体の非回転部分に支持される。図１に示すように、支持
腕３はボス４から放射方向に延びるように支持され、ボ
ス４と一体の取付片５がボルト挿通孔６へ挿通したボル
トにより、図示してない回転軸にスプライン嵌合した取
付フランジに結合される。図２に示すように案内筒１２
の内空部に収容される各磁石支持筒２３，１３には、磁
石２５，１５がそれぞれ案内筒１２の各強磁性板１９に
対向し、かつ強磁性板１９に対する極性が周方向交互に
異なるように結合される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An eddy current reduction device includes a braking drum 2 made of a conductor shown in FIG. 1, an immobile guide cylinder 12 made of a non-magnetic material shown in FIG. 2, and a movable magnet support housed inside the guide cylinder 12. It comprises a cylinder 23 and a stationary magnet support cylinder 13. A large number of cooling fins 2a are provided on the outer peripheral surface of the braking drum 2 at equal intervals in the circumferential direction. As shown in FIG. 3, both ends of the braking drum 2 and the cooling fin 2a are made of a good conductor such as copper. The annular bodies 7, 7a and the annular bodies 8, 8a are connected, and the distal ends of the plurality of support arms 3 are connected to the annular body 8 at the base end of the braking drum 2 by welding or the like. However, the distal end of the support arm 3 may be bent to the left and then directly welded to the base end wall of the braking drum 2. A guide cylinder 12 having an inner space with a rectangular cross section is supported by a non-rotating portion of the vehicle body so as to face the inside of the braking drum 2. As shown in FIG. 1, the support arm 3 is supported so as to extend in the radial direction from the boss 4, and a mounting piece 5 integrated with the boss 4 is splined to a rotating shaft (not shown) by a bolt inserted into a bolt insertion hole 6. It is connected to the fitted mounting flange. As shown in FIG.
The magnets 25 and 15 of the magnet support cylinders 23 and 13 housed in the inner space of the guide cylinder 12 face the respective ferromagnetic plates 19 of the guide cylinder 12 and the polarities to the ferromagnetic plates 19 are alternately different in the circumferential direction. And so on.
【００１２】図２に示すように案内筒１２にはアルミニ
ウムなどの非磁性体からなる外筒部１２ａと内筒部１２
ｂとの両端に、環状の端壁１２ｃ，１２ｄを一体に結合
してなり、外筒部１２ａに多数の強磁性板１９が周方向
等間隔に結合される。実際には、強磁性板１９は外筒部
１２ａを鋳造する際に鋳込まれる。案内筒１２は内筒部
１２ｂと一体の取付フランジ２０のボルト挿通孔６ａへ
挿通したボルトにより、例えば車両用変速機の壁部など
の車体の非回転部分に固定される。案内筒１２の端壁１
２ｃに結合したアクチユエータ３１は、シリンダにピス
トンを嵌挿して両端に油室を区画され、ピストンに結合
したロツドがシリンダから外部へ突出され、かつ後述す
る可動の磁石支持筒２３に連結され、磁石支持筒２３を
磁石２５の配列ピツチだけ正逆回動可能に構成される。
アクチユエータ３１の油室には、導管３２，３３の一方
から圧油を供給され、他方から油を油槽へ戻されるよう
になつている。磁石２５は磁石支持筒２３の外周面に重
ね合され、各磁石２５の周方向端部に形成した段部の間
へ非磁性体からなる固定金具１６を当て、ボルト１７に
より磁石支持筒２３へ締結される。磁石１５も同様にし
て磁石支持筒１３に支持される。As shown in FIG. 2, the guide cylinder 12 has an outer cylinder 12a and an inner cylinder 12 made of a non-magnetic material such as aluminum.
b, both ends are integrally joined with annular end walls 12c and 12d, and a large number of ferromagnetic plates 19 are joined to the outer cylindrical portion 12a at equal intervals in the circumferential direction. Actually, the ferromagnetic plate 19 is cast when the outer cylinder portion 12a is cast. The guide tube 12 is fixed to a non-rotating portion of the vehicle body such as a wall portion of a vehicle transmission, for example, by a bolt inserted into the bolt insertion hole 6a of the mounting flange 20 integrated with the inner cylinder portion 12b. End wall 1 of guide tube 12
The actuator 31 connected to the actuator 2c has an oil chamber defined at both ends by inserting a piston into the cylinder, and a rod connected to the piston protrudes from the cylinder to the outside. The support cylinder 23 is configured to be rotatable forward and backward by an arrangement pitch of the magnets 25.
Pressure oil is supplied to the oil chamber of the actuator 31 from one of the conduits 32 and 33, and the oil is returned to the oil tank from the other. The magnet 25 is superimposed on the outer peripheral surface of the magnet support cylinder 23, and a fixing bracket 16 made of a non-magnetic material is applied between steps formed at circumferential ends of the magnets 25, and the magnet 17 is attached to the magnet support cylinder 23 by bolts 17. Will be concluded. The magnet 15 is similarly supported by the magnet support tube 13.
【００１３】図３，５に示すように各強磁性板１９の制
動ドラム２の内周面２ｂに対向する外面１９ａの軸方向
寸法ａは、磁石２５，１５の外面に対向する内面１９ｂ
の軸方向寸法ｂよりも長くする。詳しくは、外面１９ａ
の軸方向寸法ａは、制動ドラム２の両端壁に結合した環
状体７，８の間隔と等しくする。また、内面１９ｂの軸
方向寸法ｂは、磁石２５，１５の外面を覆うような軸方
向寸法、つまり磁石２５の左端縁から磁石１５の右端縁
までの寸法と等しくする。As shown in FIGS. 3 and 5, the axial dimension a of the outer surface 19a of each ferromagnetic plate 19 which faces the inner peripheral surface 2b of the braking drum 2 is the inner surface 19b which faces the outer surfaces of the magnets 25 and 15.
Is larger than the dimension b in the axial direction. For details, see the outer surface 19a.
Is made equal to the distance between the annular bodies 7, 8 connected to both end walls of the braking drum 2. The axial dimension b of the inner surface 19b is equal to the axial dimension covering the outer surfaces of the magnets 25 and 15, that is, the dimension from the left edge of the magnet 25 to the right edge of the magnet 15.
【００１４】次に、本発明による渦電流減速装置の作動
について説明する。非制動時、図３に示すように、各磁
石２５，１５の強磁性板１９に対向する極性が異なる
時、磁石支持筒２３，１３と強磁性板１９との間に短絡
的磁気回路ｗが形成され、制動ドラム２には磁界を及ぼ
さない。非制動時の短絡的磁気回路ｗは、径外方かつ軸
方向へ広がるので、磁束密度が小さくなり、磁気洩れに
よる引きずりトルクが抑えられる。したがつて、強磁性
板１９を従来のものよりも若干薄くしても差し支えな
い。Next, the operation of the eddy current reduction device according to the present invention will be described. When the brakes are not applied, as shown in FIG. 3, when the polarities of the magnets 25 and 15 facing the ferromagnetic plate 19 are different, a short-circuit magnetic circuit w is formed between the magnet support cylinders 23 and 13 and the ferromagnetic plate 19. It is formed and does not exert a magnetic field on the braking drum 2. Since the short-circuit magnetic circuit w at the time of non-braking spreads radially outward and in the axial direction, the magnetic flux density decreases, and drag torque due to magnetic leakage is suppressed. Therefore, the ferromagnetic plate 19 may be slightly thinner than the conventional one.
【００１５】制動時、図４に示すように、磁石支持筒２
３を磁石２５の配列ピツチだけ回動し、各磁石２５，１
５の強磁性板１９に対する極性を同じにすると、各磁石
２５，１５の磁界が強磁性板１９を経て制動ドラム２に
達し、回転する制動ドラム２が磁界を横切る時、制動ド
ラム２に流れる渦電流に基づく制動トルクが発生する。
この時、各磁石支持筒２３，１３と制動ドラム２との間
に磁気回路ｚが発生する。すなわち、磁石支持筒２３の
場合について説明すれば、磁石２５から強磁性板１９、
制動ドラム２、隣りの強磁性板１９、隣りの磁石２５、
磁石支持筒２３を経て元の磁石２５へと磁気回路ｚが発
生する。At the time of braking, as shown in FIG.
3 is rotated by the arrangement pitch of the magnets 25, and each magnet 25, 1 is rotated.
5 has the same polarity with respect to the ferromagnetic plate 19, the magnetic field of each magnet 25, 15 reaches the brake drum 2 via the ferromagnetic plate 19, and when the rotating brake drum 2 crosses the magnetic field, the vortex flowing through the brake drum 2 A braking torque based on the current is generated.
At this time, a magnetic circuit z is generated between each of the magnet support cylinders 23 and 13 and the braking drum 2. That is, the case of the magnet support cylinder 23 will be described.
Braking drum 2, adjacent ferromagnetic plate 19, adjacent magnet 25,
A magnetic circuit z is generated in the original magnet 25 via the magnet support cylinder 23.
【００１６】図６，７に示す実施例では、渦電流減速装
置は例えば車両用変速機の出力回転軸６１に結合される
１対の導体からなる左右１対の制動円板６２と、左右１
対の制動円板６２の間に配設されるアルミニウムなどの
非磁性体からなる案内筒７２と、案内筒７２の内空部に
相対回動可能に収容した内外１対の磁石支持筒７３，７
３Ａとを備えている。制動円板６２は回転軸６１にスプ
ライン嵌合して固定されるボス６４と、ボス６４から放
射状に延びる支持腕６３と、円板部とを、例えば鋳造に
より一体に形成される。In the embodiment shown in FIGS. 6 and 7, the eddy current reduction device includes, for example, a pair of left and right braking disks 62 formed of a pair of conductors coupled to an output rotation shaft 61 of a vehicle transmission.
A guide cylinder 72 made of a non-magnetic material such as aluminum disposed between the pair of braking disks 62, and a pair of inner and outer magnet support cylinders 73 rotatably housed in the inner space of the guide cylinder 72; 7
3A. The braking disk 62 is formed integrally with a boss 64 fixed by spline fitting to the rotating shaft 61, a support arm 63 extending radially from the boss 64, and a disk portion, for example, by casting.
【００１７】案内筒７２は外筒部７２ａと内筒部７２ｂ
との両端に左右１対の端壁７２ｃを結合して断面長方形
の内空部を形成される。図示の実施例では、案内筒７２
はボス７１から放射方向に延びる支持腕７８と一体の断
面Ｃ字形の筒体に、環状の蓋板を結合して構成される。
ボス７１は軸受７０により回転軸６１に支持される。案
内筒７２は適当な手段により車両の非回転部分、例えば
変速機の歯車箱に固定される。案内筒７２の両端壁７２
ｃに多数の強磁性板７９が周方向等間隔に結合される。
好ましくは、強磁性板７９は案内筒７２の鋳造の際に鋳
込まれる。The guide cylinder 72 includes an outer cylinder 72a and an inner cylinder 72b.
A pair of left and right end walls 72c are coupled to both ends of the inner space to form an inner space having a rectangular cross section. In the illustrated embodiment, the guide cylinder 72
Is formed by connecting a ring-shaped lid plate to a C-shaped cylindrical body integral with a support arm 78 extending radially from the boss 71.
The boss 71 is supported on the rotating shaft 61 by a bearing 70. The guide tube 72 is fixed to the non-rotating part of the vehicle, for example, to the gearbox of the transmission by suitable means. Both end walls 72 of guide tube 72
A number of ferromagnetic plates 79 are coupled to c at equal intervals in the circumferential direction.
Preferably, the ferromagnetic plate 79 is cast when the guide tube 72 is cast.
【００１８】内側の磁石支持筒７３Ａは案内筒７２の内
部に固定支持される。外側の磁石支持筒７３は内側の磁
石支持筒７３Ａの外周壁に軸受８０により回動可能に支
持される。磁石支持筒７３，７３Ａの両端面に潤滑油を
含浸させた薄い滑り板７４が挟まれ、強磁性板７９に摺
接される。磁石支持筒７３Ａはアルミニウムなどの非磁
性体からなり、多数の扇形をなす磁石７３Ａが、各強磁
性板７９と対向しかつ強磁性板７９に対する極性が周方
向に交互に異なるように配設される。好ましくは、磁石
７３Ａは磁石支持筒７３Ａに鋳込まれる。磁石支持筒７
３にも同様にして多数の磁石７３が各強磁性板７９と対
向しかつ強磁性板７９に対する極性が周方向に交互に異
なるように配設される。図示してないが、磁石支持筒７
３の外周壁に形成した部分歯車に、案内筒７２に固定し
た電動機のピニオンが噛み合され、磁石支持筒７３は磁
石７５の配列ピツチだけ正逆回動可能とされる。The inner magnet support tube 73A is fixedly supported inside the guide tube 72. The outer magnet support cylinder 73 is rotatably supported by a bearing 80 on the outer peripheral wall of the inner magnet support cylinder 73A. A thin sliding plate 74 impregnated with lubricating oil is sandwiched between both end surfaces of the magnet support cylinders 73 and 73A, and is slidably contacted with the ferromagnetic plate 79. The magnet support cylinder 73A is made of a non-magnetic material such as aluminum, and a large number of fan-shaped magnets 73A are disposed so as to face the ferromagnetic plates 79 and alternately have different polarities to the ferromagnetic plates 79 in the circumferential direction. You. Preferably, the magnet 73A is cast into the magnet support cylinder 73A. Magnet support cylinder 7
Similarly, a large number of magnets 73 are disposed so as to face each ferromagnetic plate 79 and have polarities alternately different from each other in the circumferential direction. Although not shown, the magnet support cylinder 7
The pinion of the electric motor fixed to the guide cylinder 72 is engaged with the partial gear formed on the outer peripheral wall of the magnet 3, and the magnet support cylinder 73 can be rotated forward and backward by the pitch of the magnets 75.
【００１９】図７に左側の強磁性板７９を示すように、
各強磁性板７９の制動円板６２に対向する外面７９ａの
径方向寸法ｃは、磁石７５，７５Ａに対向する内面７９
ｂの径方向寸法ｄよりも長くする。詳しくは、各強磁性
板７９の外面７９ａの径方向寸法ｃは、制動円板６２の
内外周縁に結合した環状体６８，６７の間隔と等しくす
る。また、各強磁性板７９の内面７９ｂの径方向寸法ｄ
は、磁石７５Ａ，７５の外面を覆うような径方向寸法、
つまり磁石７５Ａの内周縁から磁石７５の外周縁までの
寸法と等しくする。As shown in FIG. 7 showing the left ferromagnetic plate 79,
The radial dimension c of the outer surface 79a of each ferromagnetic plate 79 that faces the braking disk 62 is the inner surface 79 that faces the magnets 75 and 75A.
b is made longer than the radial dimension d. More specifically, the radial dimension c of the outer surface 79a of each ferromagnetic plate 79 is made equal to the interval between the annular bodies 68 and 67 connected to the inner and outer peripheral edges of the braking disk 62. The radial dimension d of the inner surface 79b of each ferromagnetic plate 79
Are radial dimensions that cover the outer surfaces of the magnets 75A, 75,
That is, the dimension from the inner peripheral edge of the magnet 75A to the outer peripheral edge of the magnet 75 is made equal.
【００２０】１対の制動円板６２が回転軸６１と一緒に
回転されるのに対し、図６に示すように、非制動時、内
外の磁石７５Ａ，７５の強磁性板７９に対する極性が異
なり、１対の強磁性板７９の間で短絡的磁気回路ｗが生
じ、制動円板６２には磁界を及ぼさない。１対の強磁性
板７９は磁石７５Ａ，７５を両側から全面的に挟む状態
にあるから、制動円板６２への洩れ磁束は殆どなく、制
動円板６２は引きずりトルクを受けない。While the pair of braking disks 62 are rotated together with the rotating shaft 61, as shown in FIG. 6, when braking is not performed, the polarities of the inner and outer magnets 75A and 75 with respect to the ferromagnetic plate 79 are different. A short-circuit magnetic circuit w is generated between the pair of ferromagnetic plates 79, and no magnetic field is applied to the braking disk 62. Since the pair of ferromagnetic plates 79 sandwich the magnets 75A and 75 entirely from both sides, there is almost no leakage magnetic flux to the braking disk 62, and the braking disk 62 does not receive drag torque.
【００２１】制動時、外側の磁石支持筒７３を磁石７５
の配列ピツチだけ回動すると、径方向に重なる内外の磁
石７５Ａ，７５の強磁性板７９に対する極性が同じにな
る。したがつて、図８に示すように、各磁石７５Ａ，７
５が等しく強磁性板７９を経て制動円板６２に磁界を及
ぼす。回転する制動円板６２が磁界を横切る時、制動円
板６２に渦電流が発生し、制動円板６２が制動トルクを
発生する。この時、左右１対の制動円板６２の間に１対
の強磁性板７９と磁石７５Ａ，７５を通る磁気回路ｚが
生じる。During braking, the outer magnet support cylinder 73 is
, The polarities of the inner and outer magnets 75A, 75 overlapping in the radial direction with respect to the ferromagnetic plate 79 become the same. Accordingly, as shown in FIG.
5 equally applies a magnetic field to the braking disk 62 via the ferromagnetic plate 79. When the rotating brake disk 62 crosses the magnetic field, an eddy current is generated in the brake disk 62 and the brake disk 62 generates a braking torque. At this time, a magnetic circuit z is generated between the pair of left and right braking disks 62 through the pair of ferromagnetic plates 79 and the magnets 75A and 75.
【００２２】[0022]
【発明の効果】本発明は上述のように、車体などの非回
転部分に取り付けられ断面長方形の内空部を有する非磁
性体からなる案内筒と、該案内筒の内空部に収容した少
くとも一方が可動の磁石支持筒と、該磁石支持筒に周方
向等間隔に結合した多数の磁石と、前記案内筒の前記各
磁石と対向する部分に鋳込んだ強磁性板と、前記案内筒
に対向するよう回転軸に結合されかつ前記強磁性板と対
向しない両端部または内外周縁部に、銅などの良伝導体
からなる環状体を具備する制動ドラムまたは制動円板と
を有し、前記磁石からの磁界により渦電流に基づく制動
力を前記制動ドラムまたは制動円板に発生させる渦電流
減速装置において、前記強磁性板の外面の端縁または周
縁を前記制動ドラムまたは制動円板と前記環状体との境
界に合わせ、前記強磁性板の内面の端縁または周縁を前
記磁石の外面の端縁または周縁に合わせたものであり、
強磁性板の回転軸を含む平面により切断した断面形状
が、制動ドラムまたは制動円板の方へ広がりをもつ台形
になるので、磁石からの磁界が外部へ洩れることなく、
効率的に制動ドラムまたは制動円板へ到達し、渦電流が
制動ドラムの軸方向または制動円板の径方向へ広がりを
もつので、制動能力が向上され、また渦電流に基づく熱
が同様に制動ドラムの軸方向または制動円板の径方向へ
広められるので、制動ドラムまたは制動円板の冷却性が
高められ、この点でも制動能力が向上される。As described above, according to the present invention, a guide cylinder made of a non-magnetic material having an inner space with a rectangular cross section attached to a non-rotating part such as a vehicle body, and a small number of guide tubes housed in the inner space of the guide tube. One of which is a movable magnet support cylinder, a number of magnets connected to the magnet support cylinder at equal intervals in the circumferential direction, a ferromagnetic plate cast in a portion of the guide cylinder facing each of the magnets, A braking drum or a braking disk having an annular body made of a good conductor such as copper at both ends or inner and outer peripheral edges which are coupled to the rotation shaft so as to face the ferromagnetic plate and do not face the ferromagnetic plate; In an eddy current reduction device for generating a braking force based on an eddy current on a braking drum or a braking disk by a magnetic field from a magnet, an edge or a peripheral edge of an outer surface of the ferromagnetic plate may be formed on the braking drum or the braking disk and the ring. According to the border with the body, Are those of the edge or periphery of the inner surface of the magnetic plate adapted to the edge or periphery of the outer surface of the magnet,
Since the cross-sectional shape cut by the plane including the rotation axis of the ferromagnetic plate becomes a trapezoid that spreads toward the braking drum or the braking disk, the magnetic field from the magnet does not leak to the outside,
Efficiently reaches the braking drum or the braking disk, and the eddy current spreads in the axial direction of the braking drum or in the radial direction of the braking disk, so that the braking ability is improved and the heat based on the eddy current is similarly damped. Since it is spread in the axial direction of the drum or in the radial direction of the brake disc, the cooling performance of the brake drum or the brake disc is enhanced, and the braking capacity is also improved in this respect.
【００２３】非制動時も磁石から制動ドラムへの磁気洩
れが抑えられるので、引きずりトルクが抑えられ、環状
体の周方向寸法を小さくできるので、制動ドラムの両端
部に接合する環状体の銅量が少くなり、軽量化と材料費
の節減に役立つ。Since the magnetic leakage from the magnet to the brake drum is suppressed even when the brake is not applied, the drag torque is suppressed, and the circumferential dimension of the annular body can be reduced. Therefore, the amount of copper in the annular body joined to both ends of the brake drum can be reduced. Reduces the weight and material costs.
【００２４】制動ドラムの両端部に接合する環状体の形
状を単純化できるので、銅の加工工数が減じられ、製造
経費を節減できる。Since the shape of the annular body joined to both ends of the braking drum can be simplified, the number of processing steps for copper can be reduced, and the production cost can be reduced.
【００２５】強磁性板が断面台形をなすので、制動円板
を案内筒に鋳込む際に強磁性板の抜止めができ、案内筒
に対する従来品同様の切削加工ができる。Since the ferromagnetic plate has a trapezoidal cross section, the ferromagnetic plate can be prevented from slipping out when the braking disk is cast into the guide cylinder, and the guide cylinder can be cut like a conventional product.
【図１】本発明が適用されるドラム型渦電流減速装置の
制動ドラムの斜視図である。FIG. 1 is a perspective view of a braking drum of a drum type eddy current reduction device to which the present invention is applied.
【図２】同渦電流減速装置の案内筒の斜視図である。FIG. 2 is a perspective view of a guide cylinder of the eddy current reduction device.
【図３】同渦電流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 the eddy current reduction device when no braking is performed.
【図４】同渦電流減速装置の制動時の正面断面図であ
る。FIG. 4 is a front sectional view of the eddy current reduction device during braking.
【図５】同渦電流減速装置の強磁性板の正面図である。FIG. 5 is a front view of a ferromagnetic plate of the eddy current reduction device.
【図６】本発明が適用される円板型渦電流減速装置の正
面断面図である。FIG. 6 is a front sectional view of a disk-type eddy current reduction device to which the present invention is applied;
【図７】同渦電流減速装置の左側の強磁性板の正面図で
ある。FIG. 7 is a front view of a left ferromagnetic plate of the eddy current reduction device.
【図８】同渦電流減速装置を周方向に展開して示す平面
断面図である。FIG. 8 is a plan sectional view showing the eddy current reduction device developed in a circumferential direction.
２：制動ドラム ３：支持腕 ７：環状体 ７ａ：環状
体 ８：環状体 ８ａ：環状体 １２：案内筒 １２
ａ：外筒部 １２ｂ：内筒部 １３：磁石支持筒 １５：磁石 １９：強磁性板 １９ａ：外面 １９ｂ：
内面 ２３：磁石支持筒 ２５：磁石 ３１：アクチユエータ ６１：回転軸 ６
２：制動円板 ６３：支持腕 ６７：環状体 ６８：環
状体 ７２：案内筒 ７２ａ：外筒部 ７２ｂ：内筒部
７３：磁石支持筒 ７３Ａ：磁石支持筒 ７５：磁石
７５Ａ：磁石 ７８：支持腕 ７９：強磁性板2: brake drum 3: support arm 7: annular body 7a: annular body 8: annular body 8a: annular body 12: guide cylinder 12
a: Outer tube part 12b: Inner tube part 13: Magnet support tube 15: Magnet 19: Ferromagnetic plate 19a: Outer surface 19b:
Inner surface 23: Magnet support cylinder 25: Magnet 31: Actuator 61: Rotating shaft 6
2: braking disc 63: support arm 67: annular body 68: annular body 72: guide cylinder 72a: outer cylinder 72b: inner cylinder 73: magnet support cylinder 73A: magnet support cylinder 75: magnet 75A: magnet 78: support Arm 79: Ferromagnetic plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 晋 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 小川 誠 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 Ｆターム(参考） 5H649 AA03 BB02 BB08 GG08 GG13 GG16 HH04 HH16 JK03 PP02 PP08 PP13 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Susumu Kobayashi 8 Dosana, Fujisawa, Kanagawa Prefecture Inside Isuzu Central Research Institute Co., Ltd. (72) Inventor Makoto Ogawa 8 Dosana, Fujisawa, Kanagawa Prefecture Isuzu Central Research Inc In-house F term (reference) 5H649 AA03 BB02 BB08 GG08 GG13 GG16 HH04 HH16 JK03 PP02 PP08 PP13
Claims (2)
長方形の内空部を有する非磁性体からなる案内筒と、該
案内筒の内空部に収容した少くとも一方が可動の磁石支
持筒と、該磁石支持筒の外周壁に周方向等間隔に結合し
た多数の磁石と、前記案内筒の前記各磁石と対向する部
分に鋳込んだ強磁性板と、前記案内筒を覆うように回転
軸に結合されかつ前記強磁性板と対向しない内周面の両
端部に銅などの良伝導体からなる環状体を具備する制動
ドラムとを有し、前記磁石からの磁界により渦電流に基
づく制動力を前記制動ドラムに発生させる渦電流減速装
置において、前記強磁性板の外面の両端縁を前記制動ド
ラムと前記環状体との境界に合わせ、前記強磁性板の内
面の両端縁を前記磁石の外面の端縁に合わせたことを特
徴とする渦電流減速装置。1. A guide cylinder made of a non-magnetic material and having a hollow section with a rectangular cross section attached to a non-rotating portion such as a vehicle body, and at least one of the magnet support pipes housed in the guide chamber. A large number of magnets coupled to the outer peripheral wall of the magnet support cylinder at equal intervals in the circumferential direction; a ferromagnetic plate cast in a portion of the guide cylinder facing each of the magnets; and a rotation rotating to cover the guide cylinder. A braking drum having an annular body made of a good conductor such as copper at both ends of an inner peripheral surface that is coupled to the shaft and does not face the ferromagnetic plate; In the eddy current reduction device for generating power on the braking drum, both end edges of the outer surface of the ferromagnetic plate are aligned with a boundary between the braking drum and the annular body, and both end edges of the inner surface of the ferromagnetic plate are connected to the magnet. Eddy current reduction characterized by matching to the outer edge Apparatus.
長方形の内空部を有する非磁性体からなる案内筒と、該
案内筒の内空部に収容した少くとも一方が可動の磁石支
持筒と、該磁石支持筒に周方向等間隔に結合した多数の
磁石と、前記案内筒の両端壁の前記各磁石と対向する部
分に鋳込んだ強磁性板と、前記案内筒の両端壁に対向す
るよう回転軸に結合されかつ前記強磁性板と対向しない
内外周縁に銅などの良伝導体からなる環状体を具備する
１対の制動円板とを有し、前記磁石からの磁界により渦
電流に基づく制動力を前記制動円板に発生させる渦電流
減速装置において、前記強磁性板の外面の内外周縁を前
記制動円板と前記環状体との境界に合わせ、前記強磁性
板の内面の内外周縁を前記磁石の内外周縁に合わせたこ
とを特徴とする渦電流減速装置。2. A guide cylinder which is attached to a non-rotating part such as a vehicle body and is made of a non-magnetic material having a hollow section having a rectangular cross section, and at least one of the magnet support pipes accommodated in the guide tube. A large number of magnets coupled to the magnet support cylinder at equal intervals in the circumferential direction; a ferromagnetic plate cast in portions of both end walls of the guide cylinder facing the respective magnets; A pair of braking disks each having an annular body made of a good conductor such as copper on the inner and outer peripheral edges not opposed to the ferromagnetic plate so as to be opposed to the ferromagnetic plate, and an eddy current is generated by a magnetic field from the magnet. In the eddy current reduction device for generating a braking force on the braking disk based on: the inner and outer peripheral edges of the outer surface of the ferromagnetic plate are aligned with the boundary between the braking disk and the annular body, and the inner and outer surfaces of the inner surface of the ferromagnetic plate are A vortex having a peripheral edge aligned with the inner and outer peripheral edges of the magnet. Flow reduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25081499A JP2001078425A (en) | 1999-09-03 | 1999-09-03 | Eddy curent decelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25081499A JP2001078425A (en) | 1999-09-03 | 1999-09-03 | Eddy curent decelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001078425A true JP2001078425A (en) | 2001-03-23 |
Family
ID=17213446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25081499A Withdrawn JP2001078425A (en) | 1999-09-03 | 1999-09-03 | Eddy curent decelerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001078425A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021176977A1 (en) | 2020-03-06 | 2021-09-10 | 日本製鉄株式会社 | Eddy current-type speed reducer |
-
1999
- 1999-09-03 JP JP25081499A patent/JP2001078425A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021176977A1 (en) | 2020-03-06 | 2021-09-10 | 日本製鉄株式会社 | Eddy current-type speed reducer |
| KR20220148879A (en) | 2020-03-06 | 2022-11-07 | 닛폰세이테츠 가부시키가이샤 | Eddy Current Type Deceleration Device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060118 |
|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20070122 |