JP5341320B2 - Torque limiter - Google Patents

Torque limiter Download PDF

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JP5341320B2
JP5341320B2 JP2007079504A JP2007079504A JP5341320B2 JP 5341320 B2 JP5341320 B2 JP 5341320B2 JP 2007079504 A JP2007079504 A JP 2007079504A JP 2007079504 A JP2007079504 A JP 2007079504A JP 5341320 B2 JP5341320 B2 JP 5341320B2
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permanent magnet
torque limiter
peripheral portion
rotating body
axial direction
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JP2008240805A (en
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正 平山
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Yamauchi Corp
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Description

この発明は、例えば複写機やプリンター、ファクシミリ等の給紙分離装置や、ドアのダンパ等に用いられるトルクリミッタに関する。   The present invention relates to a torque limiter used for, for example, a sheet feeding / separating device such as a copying machine, a printer, and a facsimile, a door damper, and the like.

トルクリミッタは、相互に対向する永久磁石とヒステリシス材とから構成されている。従来のトルクリミッタにおいては、永久磁石とヒステリシス材とのギャップおよび対向面積は、トルクリミッタの組立時に決まってしまっていた。   The torque limiter is composed of a permanent magnet and a hysteresis material facing each other. In the conventional torque limiter, the gap between the permanent magnet and the hysteresis material and the facing area are determined when the torque limiter is assembled.

このような問題点に対処して発生トルクを変更可能なトルクリミッタが、たとえば、特開２００６−０１７１４１号公報（特許文献１）に開示されている。同公報によれば、磁石とヒステリシス材との対向面積を変えることによって発生トルクを変更している。
特開２００６−０１７１４１号公報（要約） A torque limiter that can cope with such problems and change the generated torque is disclosed in, for example, Japanese Patent Laid-Open No. 2006-017141 (Patent Document 1). According to the publication, the generated torque is changed by changing the facing area between the magnet and the hysteresis material.
JP 2006-017141 A (summary)

従来のトルクリミッタは上記のように構成されていた。通常のトルクリミッタでは、永久磁石とヒステリシス材との間のエアギャップにヒステリシストルクが発生し、一定のトルク値が得られていた。このように、永久磁石とヒステリシス材との寸法が同一であれば、発生トルクは一定であり同一寸法で、より大きなシストルクを得るには限度があった。   The conventional torque limiter is configured as described above. In an ordinary torque limiter, hysteresis torque is generated in the air gap between the permanent magnet and the hysteresis material, and a constant torque value is obtained. In this way, if the dimensions of the permanent magnet and the hysteresis material are the same, the generated torque is constant and there is a limit to obtain a larger cis torque with the same dimensions.

この発明は上記のような問題点に鑑みてなされたもので、永久磁石とヒステリシス材との寸法を変えることなく、両者間により大きなトルクを発生させることが可能なトルクリミッタを提供することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to provide a torque limiter capable of generating a larger torque between the permanent magnet and the hysteresis material without changing the dimensions of the permanent magnet and the hysteresis material. And

この発明に係る、トルクリミッタは、円筒状外周部を有する第１回転体と、円筒状外周部に対向する円筒状内周部を有し、第１回転体と同軸状で互いに対して相対的に回転可能に設けられた第２回転体とからなり、第１回転体の円筒状外周部および第２回転体の円筒状内周部のいずれか一方には永久磁石が、いずれか他方にはヒステリシス材が設けられる。トルクリミッタは、第１回転体の外周部と第２回転体の内周部との間に摩擦力を発生させる摩擦力発生部材を含む。   The torque limiter according to the present invention includes a first rotating body having a cylindrical outer peripheral portion and a cylindrical inner peripheral portion facing the cylindrical outer peripheral portion, and is coaxial with the first rotating body and relatively relative to each other. A permanent magnet on one of the cylindrical outer peripheral portion of the first rotary body and the cylindrical inner peripheral portion of the second rotary body, and on the other A hysteresis material is provided. The torque limiter includes a frictional force generating member that generates a frictional force between the outer peripheral portion of the first rotating body and the inner peripheral portion of the second rotating body.

トルクリミッタは、永久磁石とヒステリシス材とから発生するヒステリシストルクだけでなく、両者間には摩擦力も発生するため、両者間により大きなトルクを発生させることが可能なトルクリミッタを提供できる。   The torque limiter generates not only the hysteresis torque generated from the permanent magnet and the hysteresis material, but also a frictional force between them, so that a torque limiter capable of generating a larger torque between the two can be provided.

好ましくは、摩擦力発生部材は、磁性粉である。   Preferably, the frictional force generating member is magnetic powder.

永久磁石は、軸方向に隣接して設けられ、相互に異なる極性を有する部分に分割されているのが好ましい。この分割された部分は複数の永久磁石で形成されてもよいし、１つの磁石をそのように着磁してもよい。   The permanent magnets are preferably provided adjacent to each other in the axial direction and divided into portions having different polarities. This divided portion may be formed of a plurality of permanent magnets, or one magnet may be magnetized in that way.

また、永久磁石は、円周方向に相互に異なる磁極が隣接するように分割されているのが好ましい。   The permanent magnet is preferably divided so that different magnetic poles are adjacent to each other in the circumferential direction.

以下、この発明の実施の形態を、図面を参照して説明する。図１はこの発明の一実施の形態に係るトルクリミッタ１０を示す要部断面図である。図１を参照して、トルクリミッタ１０は、図示のない駆動用のシャフトに止めネジ（図示なし）を介して一体的に回転するようにされた、円筒状外周部を有する第１回転体１１と、第１回転体１１の円筒外周部に対向する円筒状内周部を有する第２回転体２０とを含む。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing a torque limiter 10 according to an embodiment of the present invention. Referring to FIG. 1, a torque limiter 10 includes a first rotating body 11 having a cylindrical outer peripheral portion that is configured to rotate integrally with a driving shaft (not shown) via a set screw (not shown). And a second rotating body 20 having a cylindrical inner peripheral portion facing the cylindrical outer peripheral portion of the first rotating body 11.

第１回転体１１は、合成樹脂円筒体１２と、合成樹脂円筒体１２の外周部に接着により設けられた円筒状の永久磁石１３とを含む。永久磁石１３は、第１回転体１１の軸方向に
第１永久磁石１３ａと第２永久磁石１３ｂとが設けられている。第１永久磁石１３ａと第２永久磁石１３ｂの磁力は等しく、軸方向の長さも等しいのが好ましい。 The first rotating body 11 includes a synthetic resin cylindrical body 12 and a cylindrical permanent magnet 13 provided on the outer periphery of the synthetic resin cylindrical body 12 by adhesion. The permanent magnet 13 is provided with a first permanent magnet 13 a and a second permanent magnet 13 b in the axial direction of the first rotating body 11. It is preferable that the first permanent magnet 13a and the second permanent magnet 13b have the same magnetic force and the same axial length.

第２回転体２０は、キャップ２１とキャップ２１に対して溶着で固定されたケース２２とを含む。キャップ２１とケース２２とは、第１回転体１１と、軸摺動部１１ａ、１１ｂで摺動する。キャップ２１とケース２２の内周面には、円筒状の永久磁石１３の外周部に対向する円筒体であるヒステリシス材（半硬質磁石）２３が設けられている。ヒステリシス材２３の軸方向の長さは、第１永久磁石１３ａと第２永久磁石１３ｂとの長さの和に等しい。この実施の形態においては、永久磁石１３とヒステリシス材２３との間の隙間２４には、摩擦力発生部材として磁性粉２５を封入している。   The second rotating body 20 includes a cap 21 and a case 22 fixed to the cap 21 by welding. The cap 21 and the case 22 slide on the first rotating body 11 and the shaft sliding portions 11a and 11b. On the inner peripheral surfaces of the cap 21 and the case 22, a hysteresis material (semi-hard magnet) 23 that is a cylindrical body facing the outer peripheral portion of the cylindrical permanent magnet 13 is provided. The length of the hysteresis material 23 in the axial direction is equal to the sum of the lengths of the first permanent magnet 13a and the second permanent magnet 13b. In this embodiment, magnetic powder 25 is sealed in the gap 24 between the permanent magnet 13 and the hysteresis material 23 as a frictional force generating member.

したがって、この実施の形態に係るトルクリミッタ１０においては、永久磁石１３とヒステリシス材２３との間には、ヒステリシストルクに加えて、ヒステリシス材２３と磁性粉２５の間の摩擦力を利用することができる。したがって、同一寸法で高トルクを発生させることができる。   Therefore, in the torque limiter 10 according to this embodiment, a frictional force between the hysteresis material 23 and the magnetic powder 25 can be used between the permanent magnet 13 and the hysteresis material 23 in addition to the hysteresis torque. it can. Therefore, high torque can be generated with the same dimensions.

図２は、図１に示したトルクリミッタ１０の要部を示す拡大図であり、永久磁石１３の円周部の詳細を示す。図２を参照して、軸方向に２分割された第１永久磁石１３ａと第２永久磁石１３ｂとは、それぞれ円周方向に隣接するする部分が異なる磁極を有するように着磁されている。すなわち、たとえば、図中、右上がりの斜線で示した部分は、Ｎ極であり、左上がりの斜線で示した部分はＳ極である。   FIG. 2 is an enlarged view showing a main part of the torque limiter 10 shown in FIG. 1 and shows details of the circumferential part of the permanent magnet 13. Referring to FIG. 2, the first permanent magnet 13a and the second permanent magnet 13b that are divided into two in the axial direction are magnetized so that adjacent portions in the circumferential direction have different magnetic poles. That is, for example, in the figure, the portion indicated by the oblique line rising to the right is the N pole, and the portion indicated by the oblique line rising to the left is the S pole.

磁性粉２５は、図１および図２に示すように、磁極が軸方向に変化する位置に集中するので、磁性粉２５が外部に漏れるのを防止することが可能である。   As shown in FIGS. 1 and 2, the magnetic powder 25 is concentrated at the position where the magnetic poles change in the axial direction, so that the magnetic powder 25 can be prevented from leaking to the outside.

なお、上記実施の形態においては、別体の永久磁石に対してそれぞれ周方向に着磁したものを軸方向にＮ極とＳ極が、互いに対向するように配置したが、同一の永久磁石に周方向および軸方向に着磁してもよい。   In the above embodiment, the magnets magnetized in the circumferential direction with respect to the separate permanent magnets are arranged so that the north and south poles face each other in the axial direction. You may magnetize in the circumferential direction and an axial direction.

また、上記実施の形態においては、軸方向に分離された第１永久磁石１３ａと第２永久磁石１３ｂとは、それぞれ円周方向にも複数の磁極に着磁されている場合について説明したが、これに限らず、円周方向には異なる磁極に着磁されていなくてもよい。   In the above embodiment, the first permanent magnet 13a and the second permanent magnet 13b separated in the axial direction have been described as being magnetized by a plurality of magnetic poles in the circumferential direction. However, the present invention is not limited to this, and the magnetic poles may not be magnetized differently in the circumferential direction.

また、上記実施の形態においては、永久磁石１３が軸方向に２分割されている場合について説明したが、これに限らず、軸方向に３分割、４分割等に分割されていてもよい。この場合も相互に軸方向に隣接している部分の極性は異なるものとする。   Moreover, in the said embodiment, although the case where the permanent magnet 13 was divided into 2 in the axial direction was demonstrated, it is not restricted to this, You may divide | segment into 3 divisions, 4 divisions, etc. in the axial direction. Also in this case, the polarities of the portions adjacent to each other in the axial direction are different.

また、磁極が軸方向に変化する位置は用途に応じて任意に変更してもよい。この場合も、磁性粉２５は磁極が対向している位置に吸着されるので、特別な構造を用いなくても磁性粉２５が外部に漏れるのを防止できる。   Further, the position where the magnetic pole changes in the axial direction may be arbitrarily changed according to the application. Also in this case, since the magnetic powder 25 is adsorbed at a position where the magnetic poles face each other, the magnetic powder 25 can be prevented from leaking outside without using a special structure.

また、上記実施の形態においては、永久磁石を第１回転体に取り付け、ヒステリシス材を第２回転体に取り付けた場合について説明したが、これを逆にしてもよい。   Moreover, in the said embodiment, although the case where the permanent magnet was attached to the 1st rotary body and the hysteresis material was attached to the 2nd rotary body was demonstrated, you may reverse this.

また、上記実施の形態においては、摩擦力発生部材として磁性粉を例に上げて説明したが、これ以外のものであっても、永久磁石またはヒステリシス材との間で摩擦力を生じるものであれば、任意のものが使用できる。   In the above embodiment, the magnetic powder is taken as an example of the frictional force generating member, but even if it is other than this, it may generate a frictional force with a permanent magnet or a hysteresis material. Any can be used.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示された実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

この発明に係るトルクリミッタは、発生するトルクを増大させることが可能であるため、トルクリミッタとして有利に使用される。   Since the torque limiter according to the present invention can increase the generated torque, it is advantageously used as a torque limiter.

この発明の一実施の形態に係るトルクリミッタの断面図である。It is sectional drawing of the torque limiter which concerns on one embodiment of this invention. 図１に示したトルクリミッタの要部を示す図である。It is a figure which shows the principal part of the torque limiter shown in FIG.

符号の説明Explanation of symbols

１０ トルクリミッタ、１１ 第１回転体、１２ 合成樹脂円筒体、１３ 永久磁石、２０ 第２回転体、２１ キャップ、２２ ケース、２３ ヒステリシス材、２４ 隙間、２５ 磁性粉。 DESCRIPTION OF SYMBOLS 10 Torque limiter, 11 1st rotary body, 12 Synthetic resin cylindrical body, 13 Permanent magnet, 20 2nd rotary body, 21 Cap, 22 Case, 23 Hysteresis material, 24 Crevice, 25 Magnetic powder.

Claims (2)

円筒状外周部を有する第１回転体と、前記円筒状外周部に対向する円筒状内周部を有し、前記第１回転体と同軸状で互いに対して相対的に回転可能に設けられた第２回転体とからなり、前記第１回転体の円筒状外周部および前記第２回転体の円筒状内周部のいずれか一方には永久磁石が、いずれか他方にはヒステリシス材が設けられるトルクリミッタであって、
前記第１回転体の外周部と前記第２回転体の内周部との間に摩擦力を発生させる磁性粉を封入するとともに、
前記永久磁石は、軸方向に複数隣接して設けられ、相互に異なる極性を有する部分に分割され、
前記相互に異なる極性を有する部分は軸方向に対向するよう配置される、
トルクリミッタ。 A first rotating body having a cylindrical outer peripheral portion and a cylindrical inner peripheral portion opposed to the cylindrical outer peripheral portion are provided coaxially with the first rotating body and relatively rotatable with respect to each other. A permanent magnet is provided on one of the cylindrical outer peripheral portion of the first rotary body and the cylindrical inner peripheral portion of the second rotary body, and a hysteresis material is provided on the other. A torque limiter,
While enclosing magnetic powder that generates a frictional force between the outer periphery of the first rotating body and the inner periphery of the second rotating body,
The permanent magnets are provided adjacent to each other in the axial direction, and are divided into portions having mutually different polarities ,
The portions having different polarities are arranged to face each other in the axial direction .
Torque limiter. 前記永久磁石は、円周方向に相互に異なる磁極が隣接するように分割されている、請求項１に記載のトルクリミッタ。   The torque limiter according to claim 1, wherein the permanent magnet is divided so that different magnetic poles are adjacent to each other in the circumferential direction.
JP2007079504A 2007-03-26 2007-03-26 Torque limiter Active JP5341320B2 (en)

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JPH10139199A (en) * 1996-11-11 1998-05-26 P M Giken Kk Torque limitter of magnetic power type
JP3059605U (en) * 1998-12-03 1999-07-13 有限会社プレサイス Hysteresis generator
JP2000179566A (en) * 1998-12-15 2000-06-27 Sumitomo Special Metals Co Ltd Torque limiter, hysteresis material for torque limiter, and its manufacture
JP2001041257A (en) * 1999-07-28 2001-02-13 Sumitomo Special Metals Co Ltd Torque limiter

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