JPH07224858A - Magnetic particle type torque limiter and manufacture thereof - Google Patents
Magnetic particle type torque limiter and manufacture thereofInfo
- Publication number
- JPH07224858A JPH07224858A JP1638794A JP1638794A JPH07224858A JP H07224858 A JPH07224858 A JP H07224858A JP 1638794 A JP1638794 A JP 1638794A JP 1638794 A JP1638794 A JP 1638794A JP H07224858 A JPH07224858 A JP H07224858A
- Authority
- JP
- Japan
- Prior art keywords
- main body
- connecting main
- magnetic
- peripheral surface
- 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.)
- Granted
Links
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Transmission Devices (AREA)
Abstract
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 determines the limit of transmission torque between a pair of connecting main bodies by a coupling force of magnetic particles, for example, a double feed prevention mechanism of a paper feeding section of a copying machine and a roller load brake. The present invention relates to an improvement of a magnetic particle type torque limiter used as.
【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 A conventional magnetic particle type torque limiter is shown in FIG.
Will be explained. In the figure, 1 is a first connecting main body made of a magnetic material, 2 is a second connecting main body made of a magnetic material and arranged concentrically inside the first connecting main body 1, 3 is between the second connecting main bodies 2 and 2. The permanent magnets 4 arranged at are, for example, 13Cr filled in the gap between the first connecting main body 1 and the second connecting main body 2.
Magnetic particles 5 of ferritic stainless steel are shafts fixed to the inner peripheral portion of the second connecting main body 2. The shaft 5 is a non-magnetic metal and is made of, for example, austenitic stainless steel. 6 are brackets fixed to both sides of the first connecting main body 1. The inner peripheral portions of the brackets 6 and 6 are in sliding contact with the shaft 5 and the second connecting main body 2. The brackets 6 and 6 are integrally formed with a protrusion 7 formed of synthetic resin and capable of transmitting torque to the outside. Φ represents the magnetic flux of the permanent magnet 3. This magnetic flux passes through the first and second connection main bodies and the magnetic particles 4 to form a closed magnetic circuit.
【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 structure as described above, the magnetic flux Φ by the permanent magnet 3 passes through the magnetic path indicated by the broken line in the figure, and the particles of the magnetic particles 4 magnetized by this magnetic flux are magnetically attracted to each other to form a continuous line. The 1st connection main body 1 and the 2nd connection main body 2 are connected so that torque can be transmitted. When a load torque exceeding the limit value is applied between the first connecting main body 1 and the second connecting main body 2, the magnetic particles 4 roll with each other or slip relative to the first connecting main body 1 and the torque above the limit value is generated. It does not communicate. The first connecting main body 1 may be the driving side and the second connecting main body 2 may be 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 constructed as described above, and the torque generating portion is magnetized to the inner peripheral surface of the first connecting main body 1 and attracted to this inner peripheral surface. The magnetic particles 4 are connected to each other. The inner peripheral surface of the first connecting main body 1 is a curved surface 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, in addition to the slip between the magnetic particles 4 and the inner peripheral surface of the first connecting main body 1, rolling friction between particles is generated. The inner peripheral surface of the main body 1 has only sliding friction at the point contact portion with the magnetic particles 4. Therefore, there is a problem that the inner peripheral surface of the first connecting main body 1 is rapidly worn, the surface condition is changed, and thus the friction coefficient is changed, and thus the transmission torque is changed.
【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。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 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, in particular, the inner peripheral surface of the first connecting main body 1 is usually subjected to some surface treatment, such as hard chrome plating or electroless nickel plating, as a measure against the above wear.
Therefore, a difference in static friction coefficient and dynamic friction coefficient occurs on the slip surface that has been subjected to such a treatment, especially at low speed rotation, for example, 10
At about rpm, a state in which torque transmission due to dynamic friction during slip and torque transmission due to static friction during stick appear alternately in a short time, that is, a state in which so-called stick-slip torque is generated. The torque fluctuation in this state is shown in FIG. In the figure, t 1 is the torque fluctuation width generated in the stick-slip state. Thus, especially at low speed rotation, for example, 10 rpm, the inner peripheral surface of the first connecting main body 1 and the magnetic particles 4 are
There was a problem in that the phenomenon involving the static friction coefficient and the dynamic friction coefficient, which had a large difference in slippage, appeared alternately and the transmission torque could not be stably limited to a constant value.
【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。The present invention has been made to solve the above problems, and a first object of the present invention is to suppress the fluctuation of the limit value of the transmission torque at the time of low speed rotation with a magnetic particle type torque limiter. In addition, the structure should have 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 at low speed rotation and to have a structure having excellent durability. 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
凹部を設けたことを特徴とする。A magnetic particle type torque limiter according to the present invention has a ring-shaped first connecting main body made of a magnetic material, and a gap is radially provided inside the first connecting main body. A second connecting body of a magnetic body arranged and rotatable with respect to the first connecting body; magnetic particles filled in the gap between the two connecting bodies; In a magnetic particle type torque limiter including a permanent magnet arranged to form a closed magnetic circuit by a connecting main body, at least the first surface facing the gap.
It is characterized in that a minute concave portion having a depth into which magnetic particles enter is provided on the inner peripheral surface of the connecting main body.
【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
設けた。Further, a minute concave portion having a depth into which the particles of the magnetic particles enter is also provided on the outer peripheral surface of the second connecting main body facing the gap.
【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 manufacturing 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。Further, it is characterized in that at least the first connecting main body among the first connecting main body and the second connecting main body is made of an iron-based sintered alloy, so that the minute recesses 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, it is characterized in that a minute recess extending in the axial direction is naturally formed on the inner peripheral surface by drawing the first connecting 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。Further, a ring-shaped rotatable first connecting main body made of a magnetic material, and arranged radially inside the first connecting main body with a gap therebetween and rotatable with respect to the first connecting 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 including a permanent magnet, at least the first connecting main body is made of an iron-based sintered alloy, and the inner peripheral surface of the first connecting main body facing the gap is subjected to steam treatment, and then zinc phosphate. It is characterized by being 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 connecting main body was also made of an iron-based sintered alloy, and the outer peripheral surface of the second connecting main body facing the gap was subjected to steam treatment and then 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 connecting main body 1 is eliminated by the minute concave portions, the fluctuation of the limit value of the transmission torque is small and the operation at low speed rotation is stable. In addition, it is possible to prevent the generation of abrasion powder and prevent the slidability of the rotating portion from being deteriorated. Further, since the magnetic flux is concentrated on the outer peripheral surface of the second connecting main body 2, the magnetic particles are strongly attracted to this outer peripheral surface and are unlikely to slip, but by providing a minute concave portion also on this outer peripheral surface, The magnetic particles can be reliably prevented from slipping. In addition, minute recesses can be effectively formed on the required surface of the connection main body by shot blasting, chemical or mechanical etching, or vapor deposition of particles. Further, the minute concave portions can be formed naturally by forming the connecting main body from the sintered alloy. Also, by forming the first connecting main body by drawing, it is possible to form the minute recesses extending in the axial direction, which are sufficient to prevent the magnetic particles from slipping in the circumferential direction. Further, in the case where the connecting 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】以下、図１乃至図６を参照して本発明を詳細
に説明する。 実施例１．図１および図２は本発明による磁性粒子式ト
ルクリミッタの一実施例を示し、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。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. Example 1. 1 and 2 show an embodiment of a magnetic particle type torque limiter according to the present invention, FIG. 1 is a partial 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 the figure, 1 is a first connecting main body made of a magnetic material, 2 is a second connecting main body made of a magnetic material and arranged concentrically inside the first connecting main body 1, 3 is the second connecting main body 2 ，
Permanent magnets arranged between 2 are magnetic particles of, for example, 13Cr ferritic stainless steel filled in the gap between the first connecting main body 1 and the second connecting main body 2, and 5 is a part of the second connecting main body 2. It is a shaft fixed to the peripheral portion. The shaft 5 is a non-magnetic metal and is made of, for example, austenitic stainless steel. 6 are brackets fixed to both sides of the first connecting main body 1. The inner peripheral portions of the brackets 6 and 6 are slidably rotatable with respect to the shaft 5. The brackets 6 and 6 are integrally formed with a protrusion 7 formed of synthetic resin and capable of transmitting torque to the outside. Φ represents the magnetic flux of the permanent magnet 3. This magnetic flux forms a closed magnetic circuit through the first and second connection main bodies and the magnetic particles. Reference numeral 9 is a minute concave portion provided on the inner peripheral surface of the first connecting main body 1.
Reference numeral 8 is a magnetic particle that has entered the minute recess 9. The depth of the minute recesses 9 is such that the particles of the magnetic particles 4 enter. Eg 4
The depth of the recess is preferably about 30 to 50 μm for magnetic particles having a particle size of about 0 to 60 μm. Such minute recesses are formed by shot blasting, chemical or mechanical etching. The minute recesses 9 may be provided not only in the effective portion (the portion where the effective magnetic flux intersects) of the inner peripheral surface of the first connecting main body 1 as shown, but also in 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 structure as described above, the magnetic flux Φ by the permanent magnet 3 passes through the magnetic path indicated by the broken line in the figure, and the particles of the magnetic particles 4 magnetized by this magnetic flux are magnetically attracted to each other to form a continuous line. The 1st connection main body 1 and the 2nd connection main body 2 are connected so that torque can be transmitted. However, the first connection subject 1 and the second connection subject 2
When a load torque equal to or more than the limit value is applied between the first and second connecting main bodies 1 and 2, the first connecting main body 1 and the second connecting main body slip to each other so that the torque larger than the limit value is not transmitted. The first connecting main body 1 may be the driving side and the second connecting main body 2 may be 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 the limit value due to slipping with each other, the magnetic particles 8 are provided in the minute recesses 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 connecting main body 1. Therefore, the slip between the first connecting main body 1 and the second connecting main body 2 is achieved only by the rolling between the magnetic particles 4. Thus, the friction coefficient becomes stable and the limit value of the transmission torque does not fluctuate. Also the first
Since the slippage 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 wear powder is prevented from entering the sliding portion to prevent the slidability from deteriorating and providing a long life. Of.
【００２０】実施例２．図３は本発明の磁性粒子式トル
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。Example 2. FIG. 3 shows a modified example of the first connecting main body 1 in the magnetic particle type torque limiter of the present invention. FIG. 3 (a) is a longitudinal sectional view of the first connecting main body 1, and FIG. 3 (b).
FIG. The first connecting main body 1 is formed by evaporating metal particles 1a to form a minute recess.
The thus-deposited particles 1a form a minute recess between adjacent vapor deposition particles to prevent the magnetic particles 4 from slipping on the inner peripheral surface of the connecting main body 1.
【００２１】実施例３．図４は本発明の磁性粒子式トル
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。Example 3. FIG. 4 shows another modified example of the first connecting main body 1 in the magnetic particle type torque limiter of the present invention. FIG. 4A is a vertical sectional view of the first connecting main body 1 and FIG. FIG. The minute recess 1b extends in the axial direction. Such minute recesses are naturally formed when the ring-shaped first connecting main body 1 is formed by drawing. The minute concave portion 1b extending in the axial direction also exhibits the same effect as that of the first embodiment. This is because the magnetic particles 8 that have entered the minute recesses are prevented from slipping in the circumferential direction.
【００２２】実施例４．図５は本発明の磁性粒子式トル
クリミッタにおける第１連結主体の微小凹部の更に別の
改変例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１０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。Example 4. FIG. 5 is a microscopic enlarged schematic view showing still another modified example of the minute recesses of the first coupling main body in the magnetic particle type torque limiter of the present invention. In this figure,
Reference numeral 10 is a material particle that constitutes the first connecting main body. The material particles 10 are iron-based sintered alloys. 20 is material particle 10
Is a hollow portion resulting from the sintering of the above to form the first connecting main body, and is seen in a large number in a tunnel shape. Reference numeral 30 denotes a zinc phosphate film portion provided on the inner peripheral surface of the first connecting main body, which is obtained by processing in a solution and has a thickness of several μm, and raw material particles on the inner peripheral surface of the first connecting main body. It is formed uniformly and with good adhesion on the entire surface of the unevenness due to 10. Before the zinc phosphate film treatment, the inner peripheral surface of the first connecting main body is subjected to steam treatment. Since FIG. 5 is a schematic diagram, the grain boundary lines between the grains are omitted. When the first connecting main body is formed of the sintered alloy, the minute recesses of the present invention are naturally obtained on the surface of the first connecting main body. The zinc phosphate film formed thereon has a function as an isolation film that prevents the magnetic particles 4 and the material particles 10 of the first connecting main body 1 from contacting with each other.
In addition, this zinc phosphate coating also has the property of having little lubricity with respect to the magnetic particles 4. Thus, in this embodiment as well, slippage between the zinc phosphate coating 30 on the inner peripheral surface of the first connecting body and the magnetic particles 4 is almost eliminated, and rolling friction between the magnetic particles is stably generated, especially at low speed rotation ( A constant transmission torque can be obtained by keeping the stick-slip state (for example, 10 rpm) small. Also, even if the zinc phosphate coating itself wears due to long-term use, there is a hardened layer due to the steam treatment that is applied to the iron-based sintered alloy as a base, and it does not lead to extreme wear and durability. Does not make it worse. In this way, the magnetic particles hardly slip on the inner peripheral surface of the first connecting main body, and a constant transmission torque can be obtained particularly when the stick-slip state at low speed rotation (for example, 10 rpm) is suppressed small. This effect is shown in FIG. In the figure, t 1 ′ is the torque fluctuation width generated in the stick-slip state. It is obvious that this t 1 ′ is much smaller than the torque fluctuation width t 1 seen in the conventional structure shown in FIG.
【００２３】実施例５．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。Example 5. The magnetic particles 4 may slip on the outer peripheral surface of the second connecting 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 connecting main body 2. The magnetic particles are not limited to 13Cr ferritic stainless steel, and other materials may be used, and the depth of the minute recesses and the size of the magnetic particles are not limited to those in the above-mentioned examples. 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。According to the present invention, the slip of the magnetic particles with respect to the connecting main body, which is the cause of the stick-slip state occurring at low speed rotation, is formed by forming minute recesses on the surface of the connecting main body to partially disperse the particles of the magnetic particles. The slip between the two connecting bodies is achieved only by the rolling between the magnetic particles, so the fluctuation of the limit value of the transmission torque is small and the operation of the torque limiter at low speed rotation is small. Has the effect of being stable. Further, since the slip on the surface of the connecting main body is eliminated, the generation of abrasion powder is reduced, and there is an effect that the slidability of the rotary sliding portion is prevented from being deteriorated and the life is extended.
【００２５】また、第２連結主体２の外周面にも微小凹
部を設ける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, by providing minute recesses also on the outer peripheral surface of the second connecting main body 2, it is possible to surely prevent the magnetic particles from slipping.
【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。Also, minute recesses can be effectively formed on the required surface of the connecting 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。Further, the minute concave portions can be formed naturally by forming the connecting main body from the sintered alloy.
【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, it is possible to naturally form the minute recesses extending in the axial direction which are sufficient to prevent the magnetic particles from slipping in the circumferential direction.
【００２９】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。Further, when the connecting main body is made of a sintered alloy and is subjected to a zinc phosphate film treatment, the zinc phosphate film has an effect that the magnetic particles are further prevented from slipping.
【００３０】更に、第２連結主体をも焼結合金で作り、
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 connecting main body is also made of a sintered alloy,
The zinc phosphate coating applied to this has an effect of further preventing the slippage of magnetic particles.
【図１】本発明による磁性粒子式トルクリミッタの一実
施例を示す一部縦断面の図である。FIG. 1 is a partial vertical cross-sectional view showing an embodiment of a magnetic particle type torque limiter according to the present invention.
【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.
【図３】本発明による磁性粒子式トルクリミッタの第１
連結主体の改変例を示し、図３の（ａ）は縦断面図、図
３の（ｂ）は横断面図である。FIG. 3 is a first magnetic particle type torque limiter according to the present invention.
FIG. 3A is a vertical cross-sectional view, and FIG. 3B is a horizontal cross-sectional view showing a modified example of the connection main body.
【図４】本発明による磁性粒子式トルクリミッタの第１
連結主体の別の改変例を示し、図４の（ａ）は縦断面
図、図４の（ｂ）は横断面図である。FIG. 4 is a first magnetic particle type torque limiter according to the present invention.
FIG. 4A is a vertical cross-sectional view and FIG. 4B is a horizontal cross-sectional view showing another modified example of the connection main body.
【図５】本発明による磁性粒子式トルクリミッタの第１
連結主体の更に別の改変例を示す顕微鏡的拡大模式図で
ある。FIG. 5 is a first magnetic particle type torque limiter according to the present invention.
It is a microscope expansion schematic diagram which shows another modification of a connection main body.
【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 diagram demonstrating the stability of the transmission torque limit value 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 vertical cross-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 diagram demonstrating the instability of the transmission torque limit value that the conventional magnetic particle type torque limiter shows 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 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 the minute recessed part 9 Micro recessed part 30 Zinc phosphate coating
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 connecting main body made of a magnetic material, and arranged radially inside the first connecting main body with a gap therebetween and rotating with respect to the first connecting main body. It is possible to arrange a second connecting main body of magnetic material, magnetic particles filled in the gap between the two connecting main bodies, and arranged so as to form a closed magnetic path by the magnetic particles and the two connecting main bodies. In a magnetic particle type torque limiter including a permanent magnet, a magnetic particle characterized in that a minute concave portion having a depth into which a particle of the magnetic particle enters is provided on at least an inner peripheral surface of the first connecting main body facing the gap. Formula torque limiter.
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
た請求項１の磁性粒子式トルクリミッタ。2. The magnetic particle type torque limiter according to claim 1, wherein a minute concave portion having a depth into which a particle of magnetic particles enters is also provided on an outer peripheral surface of the second connecting main body facing the gap.
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 of manufacturing a magnetic particle type torque limiter according to claim 1, wherein the minute recesses are 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. The minute recesses are naturally formed on the inner peripheral surface of at least the first connecting main body made of an iron-based sintered alloy among the first connecting main body and the second connecting main body. Alternatively, the method of manufacturing the magnetic particle type torque limiter according to the item 2 or 3.
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 of manufacturing a magnetic particle type torque limiter according to claim 1, wherein a minute recess extending in the axial direction is naturally formed on the inner peripheral surface by drawing the first connecting 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 connecting main body made of a magnetic material, and arranged radially inward of the first connecting main body with a gap therebetween and rotating with respect to the first connecting main body. It is possible to arrange a second connecting main body of magnetic material, magnetic particles filled in the gap between the two connecting main bodies, and arranged so as to form a closed magnetic path by the magnetic particles and the two connecting main bodies. In the magnetic particle type torque limiter including a permanent magnet, at least the first connecting main body is made of an iron-based sintered alloy, the inner peripheral surface of the first connecting main body facing the gap is steamed, and then phosphoric acid is added. Magnetic particle type torque limiter characterized by being treated with zinc coating.
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 connecting main body is also made of an iron-based sintered alloy, and the outer peripheral surface of the second connecting main body facing the gap is subjected to steam treatment and then 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 true JPH07224858A (en) | 1995-08-22 |
| JP3216391B2 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 |
|---|---|
| JP3216391B2 (en) | 2001-10-09 |
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