JP3216391B2 - Magnetic particle type torque limiter and method of manufacturing the same - Google Patents
Magnetic particle type torque limiter and method of manufacturing the sameInfo
- Publication number
- JP3216391B2 JP3216391B2 JP01638794A JP1638794A JP3216391B2 JP 3216391 B2 JP3216391 B2 JP 3216391B2 JP 01638794 A JP01638794 A JP 01638794A JP 1638794 A JP1638794 A JP 1638794A JP 3216391 B2 JP3216391 B2 JP 3216391B2
- Authority
- JP
- Japan
- Prior art keywords
- main body
- connection main
- magnetic
- magnetic particle
- torque limiter
- 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
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- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Transmission Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は一対の連結主体間の伝
達トルクの限界を、磁性粒子による結合力によって定め
るようにする、例えば複写機の紙送り部の重送防止機構
にローラの負荷ブレーキとして使用される磁性粒子式ト
ルクリミッタの改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for limiting the transmission torque between a pair of connecting bodies by the coupling force of magnetic particles. The present invention relates to an improvement of a magnetic particle type torque limiter used as a device.
【０００２】[0002]
【従来の技術】従来の磁性粒子式トルクリミッタを図７
に示し説明する。図において１は磁性材よりなる第１連
結主体、２は第１連結主体１の内側に同芯的に配置され
た磁性材よりなる第２連結主体、３は前記第２連結主体
２，２間に配置された永久磁石、４は前記第１連結主体
１と第２連結主体２の間隙に充填された例えば１３Ｃｒ
フェライト系ステンレス鋼の磁性粒子、５は上記第２連
結主体２の内周部に固着されたシャフトである。このシ
ャフト５は非磁性金属で例えばオーステナイト系ステン
レス鋼よりなる。６は前記第１連結主体１の両側に固着
されたブラケットである。このブラケット６，６の内周
部は前記シャフト５と第２連結主体２に対して摺動回転
可能に接している。このブラケット６，６は合成樹脂に
て形成され外部とトルク伝達可能な凸部７を一体的に有
している。Φは永久磁石３の磁束を示す。この磁束は第
１，第２連結主体並びに磁性粒子４を通って閉磁路を形
成している。2. Description of the Related Art FIG. 7 shows a conventional magnetic particle type torque limiter.
And will be described. In the figure, reference numeral 1 denotes a first connection main body made of a magnetic material, 2 denotes a second connection main body made of a magnetic material concentrically arranged inside the first connection main body 1, and 3 denotes a position between the second connection main bodies 2 and 2. The permanent magnet 4 disposed in the first connection main body 1 and the second connection main body 2 is filled with, for example, 13Cr.
Magnetic particles 5 of ferritic stainless steel are shafts fixed to the inner peripheral portion of the second connection main body 2. The shaft 5 is a non-magnetic metal and is made of, for example, austenitic stainless steel. 6 is a bracket fixed to both sides of the first connection main body 1. The inner peripheral portions of the brackets 6 and 6 are slidably contacted with the shaft 5 and the second connection main body 2. The brackets 6, 6 are formed of a synthetic resin and integrally have a convex portion 7 capable of transmitting torque to the outside. Φ indicates the magnetic flux of the permanent magnet 3. This magnetic flux forms a closed magnetic path through the first and second connection main bodies and the magnetic particles 4.
【０００３】次に動作について説明する。上記のように
構成されたものにおいて、永久磁石３による磁束Φが図
中破線で示す磁路を通っており、この磁束により磁化さ
れた磁性粒子４の粒が互いに磁気的に吸引されて連なり
第１連結主体１と第２連結主体２とをトルク伝達可能に
接続している。第１連結主体１と第２連結主体２との間
に限界値以上の負荷トルクが加えられると磁性粒子４同
士が互いにころがったり第１連結主体１に対してスリッ
プして限界値以上のトルクは伝達しないようになってい
る。なお、第１連結主体１が駆動側であり第２連結主体
２が被駆動側であってもよいし、もちろんその反対であ
ってもよい。Next, the operation will be described. In the configuration as described above, the magnetic flux Φ by the permanent magnet 3 passes through the magnetic path shown by the broken line in the figure, and the magnetic particles 4 magnetized by this magnetic flux are magnetically attracted to each other and connected to each other. The first connection main body 1 and the second connection main body 2 are connected so as to be able to transmit torque. When a load torque equal to or more than the limit value is applied between the first connection main body 1 and the second connection main body 2, the magnetic particles 4 roll with each other or slip with respect to the first connection main body 1, and the torque exceeding the limit value is reduced. It does not communicate. Note that the first connection main body 1 may be on the driving side and the second connection main body 2 may be on the driven side, or, of course, the opposite.
【０００４】[0004]
【発明が解決しようとする課題】従来の磁性粒子式トル
クリミッタは以上のように構成されており、トルク発生
部は第１連結主体１の内周面と、磁化されてこの内周面
に吸引連結されている磁性粒子４とからなる。第１連結
主体１の内周面は円周方向にわん曲した面で、一方の磁
性粒子４は球に近い形状である。よって限界値近くのト
ルクを伝達しているとき、磁性粒子４には第１連結主体
１の内周面とのスリップの他に粒子間のころがり摩擦が
発生しているのに対し、第１連結主体１の内周面は磁性
粒子４との点接触部のすべり摩擦のみである。そのため
第１連結主体１の内周面は摩耗が早く、面状態が変化
し、よって摩擦係数に変動を生じ、かくして伝達トルク
に変動を起こすという問題があった。The conventional magnetic particle type torque limiter is configured as described above, and the torque generating portion is magnetized by the inner peripheral surface of the first connection main body 1 and attracted to the inner peripheral surface. And magnetic particles 4 connected to each other. The inner peripheral surface of the first connection main body 1 is a surface curved in the circumferential direction, and one magnetic particle 4 has a shape close to a sphere. Therefore, when torque near the limit value is transmitted, the magnetic particles 4 are not only slipping with the inner peripheral surface of the first connection main body 1 but also rolling friction between the particles is generated. The inner peripheral surface of the main body 1 has only sliding friction at a point contact portion with the magnetic particles 4. Therefore, there is a problem that the inner peripheral surface of the first connection main body 1 wears quickly, the surface state changes, and thus the friction coefficient fluctuates, and thus the transmission torque fluctuates.
【０００５】又、摩耗粉による摺動部の摺動性悪化と言
った問題もあり寿命低下の原因であった。[0005] Further, there is a problem that the sliding property of the sliding portion is deteriorated due to abrasion powder, which is a cause of shortening the service life.
【０００６】更に第１連結主体１の内周面は特に、上記
の摩耗対策として通常何らかの表面処理、例えば硬質ク
ロムメッキ、無電解ニッケルメッキ等を施されている。
そのためかかる処理を施されたすべり面では静止摩擦係
数と動摩擦係数に差が生じ、特に低速回転、例えば１０
ｒｐｍ程度、では、スリップ時の動摩擦によるトルク伝
達とスティック時の静止摩擦によるトルク伝達とが短時
間で交互に現われる状態、いわゆる、スティックスリッ
プトルク発生の状態となる。この状態のトルク変動を図
８に示す。図中 ｔ１ がスティックスリップ状態で発
生するトルク変動幅である。この様に特に低速回転例え
ば１０ｒｐｍ時には第１連結主体１の内周面と磁性粒子
４とのすべりにおいて差の大きい静止摩擦係数と動摩擦
係数を伴う現象が交互に現われて伝達トルクを安定して
一定値に制限することができないという問題があった。Further, the inner peripheral surface of the first connection main body 1 is usually provided with some surface treatment, for example, hard chrome plating, electroless nickel plating or the like, as a measure against the above-mentioned wear.
Therefore, a difference occurs between the coefficient of static friction and the coefficient of dynamic friction on the slip surface subjected to such a treatment.
At about rpm, a state in which torque transmission due to dynamic friction at the time of slip and torque transmission due to static friction at the time of stick appear alternately in a short time, that is, a state in which stick-slip torque is generated. FIG. 8 shows the torque fluctuation in this state. Figure t 1 is the torque variation width generated by a stick-slip condition. As described above, particularly at low speed rotation, for example, at 10 rpm, a phenomenon involving a static friction coefficient and a dynamic friction coefficient having a large difference in the slip between the inner peripheral surface of the first connection main body 1 and the magnetic particles 4 alternately appears, and the transmission torque is stably maintained constant. There was a problem that the value could not be limited.
【０００７】この発明は、上述のような課題を解決する
ためになされたもので、第１の目的は磁性粒子式トルク
リミッタを、低速回転時での伝達トルクの限界値の変動
を小さくおさえ、かつ耐久性の優れた構造とすることで
ある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first object of the present invention is to provide a magnetic particle type torque limiter which suppresses a fluctuation of a limit value of a transmission torque at a low speed rotation. And a structure having excellent durability.
【０００８】また、第２の目的は低速回転時での伝達ト
ルクの限界値の変動を小さくおさえ、かつ耐久性の優れ
た構造を有するように磁性粒子式トルクリミッタを製造
する方法を提供することである。A second object of the present invention is to provide a method of manufacturing a magnetic particle type torque limiter so as to suppress the fluctuation of the limit value of the transmission torque during low-speed rotation and to have a structure with excellent durability. It is.
【０００９】[0009]
【課題を解決するための手段】この発明に係る磁性粒子
式トルクリミッタは、磁性体からなるリング状の第１連
結主体と、この第１連結主体の内方に半径方向に間隙を
置かれて配置されかつ前記第１連結主体に対して回転可
能である磁性体の第２連結主体と、前記の二つの連結主
体間の前記間隙に充填された磁性粒子と、この磁性粒子
並びに前記の二つの連結主体により閉磁路を形成するよ
うに配置された永久磁石とからなる磁性粒子式トルクリ
ミッタにおいて、前記間隙に面する少なくとも前記第１
連結主体の内周面に磁性粒子の粒が入り込む深さの微小
凹部を設け、リン酸亜鉛皮膜処理を施したことを特徴と
する。A magnetic particle type torque limiter according to the present invention comprises a ring-shaped first connection main body made of a magnetic material and a radially inward gap provided inside the first connection main body. A second connection main body of a magnetic body arranged and rotatable with respect to the first connection main body, magnetic particles filled in the gap between the two connection main bodies, the magnetic particles and the two A magnetic particle type torque limiter comprising a permanent magnet arranged so as to form a closed magnetic circuit by a coupling main body, wherein at least the first
It is characterized in that a minute concave portion having a depth into which the particles of the magnetic particles enter is provided on the inner peripheral surface of the connection main body, and a zinc phosphate coating treatment is performed .
【００１０】さらに前記間隙に面する前記第２連結主体
の外周面にも磁性粒子の粒が入り込む深さの微小凹部を
設け、リン酸亜鉛皮膜処理を施した。Further, a minute concave portion having a depth into which the magnetic particles enter is provided on the outer peripheral surface of the second connection main body facing the gap, and a zinc phosphate coating treatment is performed .
【００１１】その製法として前記微小凹部を、ショット
ブラスト、化学的又は機械的エッチング、あるいは粒子
の蒸着により形成することを特徴とする。The method is characterized in that the minute recesses are formed by shot blasting, chemical or mechanical etching, or vapor deposition of particles.
【００１２】また第１連結主体と第２連結主体のうち少
なくとも第１連結主体を鉄系焼結合金で作ることにより
その内周面に微小凹部を自ずと形成することを特徴とす
る。[0012] Further, the present invention is characterized in that at least the first connection main body of the first connection main body and the second connection main body is made of an iron-based sintered alloy, so that minute concave portions are naturally formed on the inner peripheral surface thereof.
【００１３】また前記第１連結主体を引き抜き加工する
ことにより内周面に軸方向に延びた微小凹部を自ずと形
成することを特徴とする。Further, a minute concave portion extending in the axial direction is naturally formed on the inner peripheral surface by drawing out the first connection main body.
【００１４】また磁性体からなるリング状の回転可能な
第１連結主体と、この第１連結主体の内方に半径方向に
間隙を置かれて配置されかつ前記第１連結主体に対して
回転可能である磁性体の第２連結主体と、前記の二つの
連結主体間の前記間隙に充填された磁性粒子と、この磁
性粒子並びに前記の二つの連結主体により閉磁路を形成
するように配置された永久磁石とからなる磁性粒子式ト
ルクリミッタにおいて、少なくとも前記第１連結主体を
鉄系焼結合金で作り、前記間隙に面する第１連結主体の
内周面にスチーム処理を施しその後にリン酸亜鉛皮膜処
理を施したことを特徴とする。A ring-shaped rotatable first connection main body made of a magnetic material and a radially inwardly disposed gap inside the first connection main body and rotatable with respect to the first connection main body. And a magnetic particle filled in the gap between the two connecting main bodies, and the magnetic particles and the two connecting main bodies are arranged so as to form a closed magnetic path. In a magnetic particle type torque limiter comprising a permanent magnet, at least the first connection main body is made of an iron-based sintered alloy, and the inner peripheral surface of the first connection main body facing the gap is subjected to steam treatment, and then zinc phosphate It is characterized by having been subjected to a film treatment.
【００１５】さらに前記第２連結主体をも鉄系焼結合金
で作り、前記間隙に面する第２連結主体の外周面にスチ
ーム処理を施しその後にリン酸亜鉛皮膜処理を施した。Further, the second connection main body was also made of an iron-based sintered alloy, and the outer peripheral surface of the second connection main body facing the gap was subjected to a steam treatment, and then subjected to a zinc phosphate coating treatment.
【００１６】[0016]
【作用】この発明においては、第１連結主体１の内周面
での磁性粒子４のスリップをリン酸亜鉛皮膜処理付微小
凹部によりなくしたので、伝達トルクの限界値の変動が
小さくて低速回転時の動作が安定し、かつ摩耗粉発生が
少なくなって回転部の摺動性悪化を防ぐことができる。
さらに、第２連結主体２の外周面では磁束が集中してい
るので磁性粒子はこの外周面に強く吸引されていてスリ
ップしにくいのであるが、この外周面にもリン酸亜鉛皮
膜処理付微小凹部を設けることによりここでの磁性粒子
のスリップを確実に阻止できる。また、ショットブラス
ト、化学的又は機械的エッチング、あるいは粒子の蒸着
により連結主体の所要の表面に微小凹部を効果的に形成
することができる。また、焼結合金で連結主体を作るこ
とによっても自ずと微小凹部を形成できるのである。ま
た、第１連結主体を引き抜き加工することにより作るこ
とによっても磁性粒子が円周方向にスリップするのを阻
止するに十分である、軸方向に延びた微小凹部を形成で
きる。また、連結主体を焼結合金で作りこれにリン酸亜
鉛皮膜処理を施したものは、そのリン酸亜鉛皮膜により
磁性粒子は一層スリップしにくくなされる。In the present invention, since the slip of the magnetic particles 4 on the inner peripheral surface of the first connection main body 1 is eliminated by the minute concave portion with the zinc phosphate coating treatment, the fluctuation of the limit value of the transmission torque is small and the rotation speed is low. The operation at the time is stable, and the generation of abrasion powder is reduced, so that it is possible to prevent the slidability of the rotating portion from deteriorating.
Further, although the magnetic flux in the outer peripheral surface of the second connecting entity 2 are concentrated magnetic particles are hard to slip have been strongly attracted to the outer peripheral surface, zinc phosphate skin to the outer peripheral surface
By providing the minute recess with the film treatment, the slip of the magnetic particles here can be surely prevented. Further, minute concave portions can be effectively formed on a required surface of the connection main body by shot blasting, chemical or mechanical etching, or vapor deposition of particles. Also, by forming the connection main body from a sintered alloy, the minute concave portions can be formed naturally. Also, by forming the first connection main body by drawing, it is possible to form minute concave portions extending in the axial direction, which are sufficient to prevent the magnetic particles from slipping in the circumferential direction. In the case where the connection main body is made of a sintered alloy and is subjected to a zinc phosphate coating treatment, the zinc phosphate coating makes the magnetic particles less likely to slip.
【００１７】[0017]
【実施例】先ず、図１乃至図４を参照して本発明の参考
例を詳細に説明する。参考 例１． 図１および図２は本発明による磁性粒子式トルクリミッ
タの一参考例を示し、図１は一部縦断面の図であり、図
２は図１の主要部を拡大して示す図である。EXAMPLES First, a reference for the present invention with reference to FIGS
An example will be described in detail. Reference Example 1. 1 and 2 show a reference example of a magnetic particle type torque limiter according to the present invention. FIG. 1 is a partially longitudinal sectional view, and FIG. 2 is an enlarged view showing a main part of FIG.
【００１８】図において１は磁性材よりなる第１連結主
体、２は第１連結主体１の内側に同芯的に配置された磁
性材よりなる第２連結主体、３は前記第２連結主体２，
２間に配置された永久磁石、４は前記第１連結主体１と
第２連結主体２の間隙に充填された例えば１３Ｃｒフェ
ライト系ステンレス鋼の磁性粒子、５は上記の第２連結
主体２の内周部に固着されたシャフトである。このシャ
フト５は非磁性金属で例えばオーステナイト系ステンレ
ス鋼よりなる。６は前記第１連結主体１の両側に固着さ
れたブラケットである。このブラケット６，６の内周部
は前記シャフト５に対して摺動回転可能に配置されてい
る。このブラケット６，６は合成樹脂にて形成され外部
とトルク伝達可能な凸部７を一体的に有している。Φは
永久磁石３の磁束を示す。この磁束は第１，第２連結主
体並びに磁性粒子を通って閉磁路を形成している。９は
第１連結主体１の内周面に設けられた微小凹部である。
８は微小凹部９に入った磁性粒子である。微小凹部９の
深さは磁性粒子４の粒が入り込む程度である。例えば４
０〜６０μｍ程度の粒径の磁性粒子に対して、凹部の深
さは３０〜５０μｍ程度とするのが良い。かかる微小凹
部はショットブラスト、化学的又は機械的エッチングに
より形成される。なお、この微小凹部９は図示の通り第
１連結主体１の内周面の有効部（有効磁束が交差する部
分）に設けるのみならず、内周面の全面に設けてもよ
い。In FIG. 1, reference numeral 1 denotes a first connection main body made of a magnetic material, 2 denotes a second connection main body made of a magnetic material disposed concentrically inside the first connection main body 1, and 3 denotes the second connection main body 2 ,
The permanent magnets 4 arranged between the two are magnetic particles of, for example, 13Cr ferritic stainless steel filled in the gap between the first connection main body 1 and the second connection main body 2, and 5 is one of the above-described second connection main bodies 2. It is a shaft fixed to the periphery. The shaft 5 is a non-magnetic metal and is made of, for example, austenitic stainless steel. 6 is a bracket fixed to both sides of the first connection main body 1. The inner peripheral portions of the brackets 6 and 6 are arranged so as to be slidable and rotatable with respect to the shaft 5. The brackets 6, 6 are formed of a synthetic resin and integrally have a convex portion 7 capable of transmitting torque to the outside. Φ indicates the magnetic flux of the permanent magnet 3. This magnetic flux forms a closed magnetic path through the first and second connection main bodies and the magnetic particles. Reference numeral 9 denotes a minute concave portion provided on the inner peripheral surface of the first connection main body 1.
Reference numeral 8 denotes magnetic particles that have entered the minute concave portions 9. The depth of the minute recess 9 is such that the particles of the magnetic particles 4 enter. For example, 4
For magnetic particles having a particle size of about 0 to 60 μm, the depth of the recess is preferably about 30 to 50 μm. Such minute concave portions are formed by shot blasting, chemical or mechanical etching. In addition, this minute concave portion 9 may be provided not only on the effective portion (the portion where the effective magnetic flux intersects) on the inner peripheral surface of the first connection main body 1 as shown, but also on the entire inner peripheral surface.
【００１９】次に動作について説明する。上記のように
構成されたものにおいて、永久磁石３による磁束Φが図
中破線で示す磁路を通っており、この磁束により磁化さ
れた磁性粒子４の粒が互いに磁気的に吸引されて連なり
第１連結主体１と第２連結主体２とをトルク伝達可能に
接続している。しかし第１連結主体１と第２連結主体２
との間で限界値以上の負荷トルクが加えられると第１連
結主体１と第２連結主体とが互いにすべって限界値以上
のトルクは伝達しないようになっている。なお、第１連
結主体１が駆動側であり第２連結主体２が被駆動側であ
ってもよいし、もちろんその反対であってもよい。第１
連結主体１と第２連結主体２とが互いにすべって限界値
以上のトルクを伝達しないのであるが、本発明により第
１連結主体１の内周面に設けた微小凹部９に磁性粒子８
が入り込むので、磁性粒子４は第１連結主体１の内周面
をスリップすることはない。従って、第１連結主体１と
第２連結主体２との間のすべりは磁性粒子４の粒間のこ
ろがりのみによって達成される。かくして摩擦係数が安
定し、伝達トルクの限界値は変動しなくなる。また第１
連結主体１の内周面での磁性粒子４のスリップを無くし
たので、摩耗粉の発生がほとんど無くなり、従って摺動
部への摩耗粉の侵入が無くなり摺動性悪化を防ぎ、長寿
命となるのである。Next, the operation will be described. In the configuration as described above, the magnetic flux Φ by the permanent magnet 3 passes through the magnetic path shown by the broken line in the figure, and the magnetic particles 4 magnetized by this magnetic flux are magnetically attracted to each other and connected to each other. The first connection main body 1 and the second connection main body 2 are connected so as to be able to transmit torque. However, the first connecting entity 1 and the second connecting entity 2
When a load torque equal to or more than the limit value is applied between the first and second connection main bodies 1, the first connection main body 1 and the second connection main body do not transmit torque exceeding the limit value. Note that the first connection main body 1 may be on the driving side and the second connection main body 2 may be on the driven side, or, of course, the opposite. First
Although the connecting main body 1 and the second connecting main body 2 do not transmit torque exceeding a limit value due to slipping with each other, the magnetic particles 8 are formed in the minute concave portions 9 provided on the inner peripheral surface of the first connecting main body 1 according to the present invention.
, The magnetic particles 4 do not slip on the inner peripheral surface of the first connection main body 1. Therefore, the slip between the first connection main body 1 and the second connection main body 2 is achieved only by the rolling between the magnetic particles 4. Thus, the friction coefficient is stabilized, and the limit value of the transmission torque does not fluctuate. Also the first
Since the slip of the magnetic particles 4 on the inner peripheral surface of the connecting main body 1 is eliminated, the generation of wear powder is almost eliminated, and therefore, the penetration of wear powder into the sliding portion is prevented, and the deterioration of slidability is prevented, resulting in a longer life. It is.
【００２０】参考例２． 図３は参考例１で述べた磁性粒子式トルクリミッタにお
ける第１連結主体１の改変例を示し、図３の（ａ）は第
１連結主体１の縦断面図、図３の（ｂ）はその横断面図
である。この第１連結主体１は微小凹部を形成するのに
金属の粒子１ａを蒸着したものである。このように蒸着
した粒子１ａは隣接した蒸着粒子の間に微小凹部を形成
して磁性粒子４が連結主体１の内周面をスリップするの
を阻止する。 Reference Example 2 Figure 3 shows a first modification of the coupling body 1 in the magnetic particle type torque limiter described in Reference Example 1, longitudinal sectional view of (a) the first coupling body 1 3, in FIG. 3 (b) FIG. The first connection main body 1 is formed by depositing metal particles 1a to form minute concave portions. The particles 1a deposited in this manner form minute recesses between adjacent deposited particles, and prevent the magnetic particles 4 from slipping on the inner peripheral surface of the connection main body 1.
【００２１】参考例３． 図４は参考例１で述べた磁性粒子式トルクリミッタにお
ける第１連結主体１の別の改変例を示し、図４の（ａ）
は第１連結主体１の縦断面図、図４の（ｂ）はその横断
面図である。この微小凹部１ｂは軸方向に延びている。
かかる微小凹部はリング状の第１連結主体１を引き抜き
加工で作ると自ずと形成される。かかる軸方向に延びた
微小凹部１ｂも実施例１と同じ作用効果を発揮する。な
ぜならばこの微小凹部に入り込んだ磁性粒子８は円周方
向にスリップすることが阻止されるからである。 Reference Example 3 FIG. 4 shows another modification of the first connection main body 1 in the magnetic particle type torque limiter described in the reference example 1, and FIG.
FIG. 4 is a longitudinal sectional view of the first connection main body 1, and FIG. 4B is a transverse sectional view thereof. This minute concave portion 1b extends in the axial direction.
Such minute concave portions are naturally formed when the ring-shaped first connection main body 1 is formed by drawing. The minute concave portion 1b extending in the axial direction also exerts the same function and effect as the first embodiment. This is because the magnetic particles 8 that have entered the minute concave portions are prevented from slipping in the circumferential direction.
【００２２】実施例１． 図５は本発明の一実施例の磁性粒子式トルクリミッタに
おける第１連結主体の微小凹部を顕微鏡的拡大模式図で
示す。この図において、１０は第１連結主体を構成する
素材粒子である。この素材粒子１０は鉄系焼結合金であ
る。２０は素材粒子１０を焼結して第１連結主体を形成
した結果の空洞部であり、トンネル状に多数みられる。
３０は第１連結主体の内周面に設けたリン酸亜鉛皮膜部
であり、溶液中で処理することにより得られ、数μｍの
厚さであり、第１連結主体の内周面における素材粒子１
０に起因した凹凸の表面全面に均一にかつ密着性良く形
成されている。なおリン酸亜鉛皮膜処理を施す前に第１
連結主体の内周面にスチーム処理を施す。図５は模式図
であるので、各粒子間の粒界の線は省略している。焼結
合金で第１連結主体を形成するとその表面に自ずと本発
明の微小凹部が得られるのである。その上に形成された
リン酸亜鉛皮膜は磁性粒子４と第１連結主体１の素材粒
子１０とが金属同士の接触をするのを防止する隔離膜と
しての作用を有する。また、このリン酸亜鉛皮膜は磁性
粒子４に対して滑性をほとんど有しない性質をも有して
いる。かくしてこの実施例でも第１連結主体の内周面の
リン酸亜鉛皮膜３０と磁性粒子４との間のスリップがほ
とんどなくなり、磁性粒子間のころがり摩擦が安定的に
発生して特に低速回転時（例えば１０ｒｐｍ）のスティ
ックスリップ状態を小さくおさえ、一定の伝達トルクが
得られる。又、長期に亘る使用により、リン酸亜鉛皮膜
自身に摩耗が起こった場合でも、下地として鉄系焼結合
金に施しているスチーム処理による硬化層が在る為極端
な摩耗には至らず耐久性を悪化さすことはない。このよ
うに第１連結主体の内周面に対して磁性粒子がほとんど
スリップせず、特に低速回転時（例えば１０ｒｐｍ）の
スティックスリップ状態を小さくおさえ、一定の伝達ト
ルクが得られる。この効果を図６に示す。図中ｔ１ ′
がスティックスリップ状態で発生するトルク変動幅であ
る。このｔ１ ′は図８に示す従来構造品にみられるト
ルク変動幅ｔ１ より大きく減少していることは明白で
ある。Embodiment 1 Figure 5 shows on a microscopic enlarged schematic view of the micro-concave portion of the first connecting mainly in the magnetic particle type torque limiter of one embodiment of the present invention. In this drawing, reference numeral 10 denotes material particles constituting the first connection main body. The material particles 10 are an iron-based sintered alloy. Numeral 20 denotes a hollow portion formed by sintering the material particles 10 to form the first connection main body, and a large number of hollow portions are seen in a tunnel shape.
Reference numeral 30 denotes a zinc phosphate coating portion provided on the inner peripheral surface of the first connection main body, which is obtained by processing in a solution, has a thickness of several μm, and has material particles on the inner peripheral surface of the first connection main body. 1
It is formed uniformly and with good adhesion over the entire surface of the unevenness caused by 0. Before applying the zinc phosphate coating,
Steam treatment is performed on the inner peripheral surface of the connection main body. Since FIG. 5 is a schematic diagram, a line of a grain boundary between each particle is omitted. When the first connection main body is formed of the sintered alloy, the minute concave portion of the present invention is naturally obtained on the surface thereof. The zinc phosphate film formed thereon has a function as an isolation film for preventing the magnetic particles 4 and the material particles 10 of the first connection main body 1 from contacting metals. The zinc phosphate coating also has the property of having little lubricity with respect to the magnetic particles 4. Thus, also in this embodiment, the slip between the zinc phosphate coating 30 on the inner peripheral surface of the first connection main body and the magnetic particles 4 is almost eliminated, and the rolling friction between the magnetic particles is stably generated. For example, a stick-slip state (for example, 10 rpm) is kept small, and a constant transmission torque is obtained. In addition, even if the zinc phosphate coating itself wears due to long-term use, there is a hardened layer due to the steam treatment applied to the iron-based sintered alloy as a base, so it does not lead to extreme wear and durability Does not worsen. As described above, the magnetic particles hardly slip on the inner peripheral surface of the first connection main body, and the stick-slip state during the low-speed rotation (for example, 10 rpm) is kept small, and a constant transmission torque can be obtained. This effect is shown in FIG. In the figure, t 1 ′
Is the torque fluctuation width generated in the stick-slip state. It is clear that this t 1 ′ is greatly reduced from the torque fluctuation width t 1 seen in the conventional structure shown in FIG.
【００２３】実施例２． 第２連結主体２の外周面に対して磁性粒子４がスリップ
してスティックスリップ状態が発生する場合もある。こ
の場合には、第２連結主体２の外周面に図１に示された
微小凹部９と同様の微小凹部を設ければ全く同様の効果
が得られる。なお、磁性粒子は１３Ｃｒフェライト系ス
テンレス鋼に限られるものではなく、他の材料であって
も良く、また、微小凹部の深さと磁性粒子の大きさとは
以上の実施例に限られるものではなくこの発明の目的を
損なわない範囲で変化させてよい。Embodiment 2 FIG. The magnetic particles 4 may slip on the outer peripheral surface of the second connection main body 2 to cause a stick-slip state. In this case, the same effect can be obtained by providing a minute recess similar to the minute recess 9 shown in FIG. 1 on the outer peripheral surface of the second connection main body 2. The magnetic particles are not limited to 13Cr ferritic stainless steel, but may be other materials, and the depth of the minute concave portions and the size of the magnetic particles are not limited to the above-described embodiment, but are limited to the above. It may be changed within a range that does not impair the object of the invention.
【００２４】[0024]
【発明の効果】この発明においては、低速回転時に発生
するスティックスリップ状態の原因である連結主体に対
する磁性粒子のスリップを、その連結主体の表面に微小
凹部を形成かつリン酸亜鉛皮膜処理を施して磁性粒子の
粒を部分的に入れ込むことにより、発生させなくしたの
で、二つの連結主体間のすべりは磁性粒子間同士のころ
がりのみにより達成され、かくして伝達トルクの限界値
の変動が小さく低速回転時でのトルクリミッタの動作が
安定するという効果を有する。また連結主体の表面での
スリップが無くなったので摩耗粉発生が少なくなり回転
摺動部の摺動性悪化を防ぎ長寿命となる効果をも有す
る。In [Effect of the Invention The present invention, a slip of the magnetic particles to the connection entity responsible for stick-slip condition occurring during low-speed rotation, and facilities the formation and zinc phosphate coating treatment with fine recesses on the surface of the connecting entities The slippage between the two connecting bodies is achieved only by the rolling between the magnetic particles, and the fluctuation of the limit value of the transmission torque is small and the speed is low This has the effect of stabilizing the operation of the torque limiter during rotation. Further, since the slip on the surface of the connection main body is eliminated, the generation of abrasion powder is reduced, and the sliding property of the rotary sliding portion is prevented from being deteriorated, so that there is also an effect of extending the life.
【００２５】また、第２連結主体２の外周面にも微小凹
部を設け、リン酸亜鉛皮膜処理を施 すことにより磁性粒
子のスリップを阻止するのを確実にできる。Further, the fine recesses in the outer peripheral surface of the second connecting entity 2 is provided, it can be reliably to prevent slipping of the magnetic particles by to facilities the zinc phosphate coating treatment.
【００２６】また、ショットブラスト、化学的又は機械
的エッチング、あるいは粒子の蒸着により連結主体の所
要の表面に微小凹部を効果的に形成することができる。Further, a minute concave portion can be effectively formed on a required surface of the connection main body by shot blasting, chemical or mechanical etching, or vapor deposition of particles.
【００２７】また、焼結合金で連結主体を作ることによ
っても自ずと微小凹部を形成できるのである。Also, by forming the connection main body with a sintered alloy, the minute concave portions can be formed naturally.
【００２８】また、第１連結主体を引き抜き加工するこ
とにより作ることによっても磁性粒子が円周方向にスリ
ップするのを阻止するのに十分である軸方向に延びた微
小凹部を自ずと形成できる。Also, by forming the first connecting main body by drawing, minute concave portions extending in the axial direction which are sufficient to prevent the magnetic particles from slipping in the circumferential direction can be naturally formed.
【００２９】また、連結主体を焼結合金で作り、スチー
ム処理し、これにリン酸亜鉛皮膜処理を施したものは、
そのリン酸亜鉛皮膜により磁性粒子が一層スリップしに
くくなされるという効果をもたらす。[0029] In addition, to create a consolidated entity in the sintered alloy, a steam
And untreated, which to that subjected to zinc phosphate coating treatment,
The zinc phosphate coating has the effect of making the magnetic particles less likely to slip.
【００３０】更に、第２連結主体をも焼結合金で作り、
スチーム処理し、これにリン酸亜鉛皮膜処理を施したも
のはなお一層磁性粒子のスリップを阻止するという効果
をもたらす。Further, the second connection main body is also made of a sintered alloy,
The one which has been subjected to the steam treatment and the zinc phosphate coating treatment has the effect of further inhibiting the slip of the magnetic particles.
【図１】 本発明による磁性粒子式トルクリミッタの一
参考例を示す一部縦断面の図である。FIG. 1 shows a magnetic particle type torque limiter according to the present invention.
It is a figure of a partial longitudinal section showing a reference example.
【図２】 図１の主要部を拡大して示す図である。FIG. 2 is an enlarged view showing a main part of FIG. 1;
【図３】 本発明による磁性粒子式トルクリミッタの第
１連結主体の他の参考例を示し、図３の（ａ）は縦断面
図、図３の（ｂ）は横断面図である。3A and 3B show another reference example of the first connection main body of the magnetic particle type torque limiter according to the present invention, wherein FIG. 3A is a longitudinal sectional view and FIG. 3B is a transverse sectional view.
【図４】 本発明による磁性粒子式トルクリミッタの第
１連結主体の更に他の参考例を示し、図４の（ａ）は縦
断面図、図４の（ｂ）は横断面図である。4 shows still another reference example of the first connection main body of the magnetic particle type torque limiter according to the present invention. FIG. 4 (a) is a longitudinal sectional view, and FIG. 4 (b) is a transverse sectional view.
【図５】 本発明による一実施例の磁性粒子式トルクリ
ミッタの第１連結主体を示す顕微鏡的拡大模式図であ
る。5 is a microscopic enlarged schematic view showing a first connecting main body of the magnetic particles torque limiter of one embodiment according to the present invention.
【図６】 本発明の磁性粒子式トルクリミッタが低速回
転において示す伝達トルク限界値安定性を証するトルク
変動波形図である。FIG. 6 is a torque fluctuation waveform chart which demonstrates the transmission torque limit value stability exhibited by the magnetic particle type torque limiter of the present invention at low speed rotation.
【図７】 従来の磁性粒子式トルクリミッタの構造を示
す一部縦断面の図である。FIG. 7 is a partial longitudinal sectional view showing the structure of a conventional magnetic particle type torque limiter.
【図８】 従来の磁性粒子式トルクリミッタが低速回転
において示す伝達トルク限界値不安定性を証するトルク
変動波形図である。FIG. 8 is a torque fluctuation waveform chart that demonstrates the transmission torque limit value instability exhibited by the conventional magnetic particle type torque limiter at low speed rotation.
１ 第１連結主体 ２ 第２連結主体 ３ 永久磁石 ４ 磁性粒子 ５ シャフト ６ ブラケット ７ ブラケット凸部 ８ 微小凹部に入った磁性粒子 ９ 微小凹部 ３０ リン酸亜鉛皮膜 DESCRIPTION OF SYMBOLS 1 1st connection main body 2 2nd connection main body 3 Permanent magnet 4 Magnetic particle 5 Shaft 6 Bracket 7 Bracket convex part 8 Magnetic particle which entered minute concave part 9 Micro concave part 30 Zinc phosphate film
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−266116（ＪＰ，Ａ) 特開 昭58−30533（ＪＰ，Ａ) 特開 昭58−30534（ＪＰ，Ａ) 特開 昭57−167535（ＪＰ，Ａ) 特開 平６−26530（ＪＰ，Ａ) 特開 平６−16968（ＪＰ，Ａ) 実開 平４−31329（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16D 7/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-266116 (JP, A) JP-A-58-30533 (JP, A) JP-A-58-30534 (JP, A) JP-A-57-30 167535 (JP, A) JP-A-6-26530 (JP, A) JP-A-6-16968 (JP, A) JP-A-4-31329 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F16D 7/00
Claims (7)
１連結主体と、この第１連結主体の内方に半径方向に間
隙を置かれて配置されかつ前記第１連結主体に対して回
転可能である磁性体の第２連結主体と、前記の二つの連
結主体間の前記間隙に充填された磁性粒子と、この磁性
粒子並びに前記の二つの連結主体により閉磁路を形成す
るように配置された永久磁石とからなる磁性粒子式トル
クリミッタにおいて、 前記間隙に面する少なくとも前記第１連結主体の内周面
に磁性粒子の粒が入り込む深さの微小凹部を設け、リン
酸亜鉛皮膜処理を施したことを特徴とする磁性粒子式ト
ルクリミッタ。1. A ring-shaped rotatable first connection main body made of a magnetic material, and a radially inwardly disposed gap inside the first connection main body and rotating with respect to the first connection main body. A second connection main body of a magnetic material that is possible, magnetic particles filled in the gap between the two connection main bodies, and the magnetic particles and the two connection main bodies are arranged to form a closed magnetic path. A magnetic particle type torque limiter comprising a permanent magnet and a minute concave portion having a depth at which magnetic particle particles enter at least an inner peripheral surface of the first connection main body facing the gap ;
A magnetic particle type torque limiter characterized by a zinc oxide film treatment .
周面にも磁性粒子の粒が入り込む深さの微小凹部を設
け、リン酸亜鉛皮膜処理を施した請求項１の磁性粒子式
トルクリミッタ。2. The magnetic particle torque according to claim 1 , wherein a minute concave portion having a depth into which the magnetic particles enter is provided on the outer peripheral surface of the second connection main body facing the gap, and a zinc phosphate coating treatment is applied . limiter.
学的又は機械的エッチング、あるいは粒子の蒸着により
形成することを特徴とする請求項１又は２の磁性粒子式
トルクリミッタの製造方法。3. The method for manufacturing a magnetic particle type torque limiter according to claim 1, wherein said minute concave portion is formed by shot blasting, chemical or mechanical etching, or vapor deposition of particles.
くとも第１連結主体を鉄系焼結合金で作ることによりそ
の内周面に微小凹部を自ずと形成することを特徴とする
請求項１又は２の磁性粒子式トルクリミッタの製造方
法。4. A minute concave portion is naturally formed on an inner peripheral surface of the first connection main body and the second connection main body by forming at least the first connection main body from an iron-based sintered alloy. Or the manufacturing method of the magnetic particle type torque limiter of 2.
とにより内周面に軸方向に延びた微小凹部を自ずと形成
することを特徴とする請求項１の磁性粒子式トルクリミ
ッタの製造方法。5. The method for manufacturing a magnetic particle type torque limiter according to claim 1, wherein a minute concave portion extending in the axial direction is naturally formed on the inner peripheral surface by drawing out the first connection main body.
１連結主体と、この第１連結主体の内方に半径方向に間
隙を置かれて配置されかつ前記第１連結主体に対して回
転可能である磁性体の第２連結主体と、前記の二つの連
結主体間の前記間隙に充填された磁性粒子と、この磁性
粒子並びに前記の二つの連結主体により閉磁路を形成す
るように配置された永久磁石とからなる磁性粒子式トル
クリミッタにおいて、 少なくとも前記第１連結主体を鉄系焼結合金で作り、前
記間隙に面する第１連結主体の内周面にスチーム処理を
施しその後にリン酸亜鉛皮膜処理を施したことを特徴と
する磁性粒子式トルクリミッタ。6. A ring-shaped rotatable first connection main body made of a magnetic material, and a radially inwardly disposed gap inside the first connection main body and rotating with respect to the first connection main body. A second connection main body of a magnetic material that is possible, magnetic particles filled in the gap between the two connection main bodies, and the magnetic particles and the two connection main bodies are arranged to form a closed magnetic path. A magnetic particle type torque limiter comprising a permanent magnet made of iron, wherein at least the first connection main body is made of an iron-based sintered alloy, and the inner peripheral surface of the first connection main body facing the gap is subjected to a steam treatment, and then phosphoric acid is added. A magnetic particle type torque limiter characterized by a zinc coating treatment.
り、前記間隙に面する第２連結主体の外周面にスチーム
処理を施しその後にリン酸亜鉛皮膜処理を施した請求項
６の磁性粒子式トルクリミッタ。7. The second connection main body is also made of an iron-based sintered alloy, and the outer peripheral surface of the second connection main body facing the gap is subjected to a steam treatment and then to a zinc phosphate coating treatment. Magnetic particle type torque limiter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01638794A JP3216391B2 (en) | 1994-02-10 | 1994-02-10 | Magnetic particle type torque limiter and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01638794A JP3216391B2 (en) | 1994-02-10 | 1994-02-10 | Magnetic particle type torque limiter and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07224858A JPH07224858A (en) | 1995-08-22 |
| JP3216391B2 true JP3216391B2 (en) | 2001-10-09 |
Family
ID=11914859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01638794A Expired - Fee Related JP3216391B2 (en) | 1994-02-10 | 1994-02-10 | Magnetic particle type torque limiter and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3216391B2 (en) |
-
1994
- 1994-02-10 JP JP01638794A patent/JP3216391B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07224858A (en) | 1995-08-22 |
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