JPH02266116A - Torque limiter - Google Patents
Torque limiterInfo
- Publication number
- JPH02266116A JPH02266116A JP29609089A JP29609089A JPH02266116A JP H02266116 A JPH02266116 A JP H02266116A JP 29609089 A JP29609089 A JP 29609089A JP 29609089 A JP29609089 A JP 29609089A JP H02266116 A JPH02266116 A JP H02266116A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnetic
- boss
- magnetic material
- cylinder
- 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.)
- Pending
Links
- 239000000696 magnetic material Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 12
- 239000006247 magnetic powder Substances 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract 4
- 239000000463 material Substances 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁性粉粒を内蔵し、所定値以Ｆの負荷に対して
は回転トルクを伝達し、所定値以上の負荷が発生したと
きにはトルクの伝達を遮断するトルクリミッタに関する
ものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention incorporates magnetic powder grains, transmits rotational torque to a load of F or more than a predetermined value, and transmits torque when a load of more than a predetermined value occurs. This relates to a torque limiter that cuts off the transmission of
この種のトルクリミッタとしては、例えば本出願人が先
に提案した実開昭５９−８６４２６号公報に開示された
ものがある。このトルクリミッタは、回転軸に軸受を介
して回転自在に支持された円筒状の外側回転部材と、軸
線方向に極性をもつ環状の永久磁石と回転軸に固着され
た磁極部材とよりなる内側回転部材と、これら両回転部
材間に介在する磁性粉粒とから構成されている。そして
前記永久磁石の外周面は非磁性材で覆われている。An example of this type of torque limiter is the one disclosed in Japanese Utility Model Application Publication No. 59-86426, which was previously proposed by the present applicant. This torque limiter consists of a cylindrical outer rotating member rotatably supported on a rotating shaft via a bearing, an annular permanent magnet with polarity in the axial direction, and a magnetic pole member fixed to the rotating shaft. It is composed of a member and magnetic powder particles interposed between these two rotating members. The outer peripheral surface of the permanent magnet is covered with a non-magnetic material.
このように構成されていることにより、回転軸とともに
永久磁石と磁極部材が回転すると、この回転は磁性粉粒
を介し回転体に伝達され従動側に伝達される。この場合
、磁性粉粒は非磁性材で覆われた永久磁石の外周部を避
けて磁極部材の外周部に集中するので、磁性粉粒の密度
が大きくなるという特長を有している。With this configuration, when the permanent magnet and the magnetic pole member rotate together with the rotating shaft, this rotation is transmitted to the rotating body through the magnetic powder particles and then transmitted to the driven side. In this case, the magnetic powder particles concentrate on the outer periphery of the magnetic pole member, avoiding the outer periphery of the permanent magnet covered with a non-magnetic material, so that the density of the magnetic powder particles is increased.
［発明が解決しようとする課題〕
しかしながら、このような従来のトルクリミッタにおい
ては、磁極部材が磁性材であるから重量が嵩み、また磁
極部材の外周面を磁極面とするため、軸線方向に大形化
するという問題がある。[Problems to be Solved by the Invention] However, in such a conventional torque limiter, since the magnetic pole member is made of a magnetic material, it is heavy, and since the outer circumferential surface of the magnetic pole member is used as the magnetic pole surface, there is a problem in the axial direction. There is a problem with increasing the size.
さらに、永久磁石を設けることなく駆動体と非駆動体と
の間に着磁された永久磁石粉を介在さ一部たものが実開
昭５０−５１０５０号公報に開示されている。しかし、
このような構造では永久磁石粉による磁路が駆動体と非
駆動体との間に形成されたコ字形環状の空間すべてにな
るので、永久磁石粉の均一な分布が得られず、安定した
トルク設定ができないというトルクリミッタとして致命
的な欠点がある。Furthermore, Japanese Utility Model Application Publication No. 50-51050 discloses a device in which magnetized permanent magnet powder is interposed between a driving body and a non-driving body without providing a permanent magnet. but,
In such a structure, the magnetic path caused by the permanent magnet powder occupies the entire U-shaped annular space formed between the driving body and the non-driving body, making it impossible to obtain a uniform distribution of the permanent magnet powder, resulting in stable torque. It has a fatal drawback as a torque limiter: it cannot be set.
本発明は以上のような点に鑑みなされたもので、簡単な
構成により安定したトルクが得られるＩ−ルクリミッタ
を提供することを目的としている。The present invention has been made in view of the above points, and an object of the present invention is to provide an I-luke limiter that can obtain stable torque with a simple configuration.
〔課題を解決するための手段］
このような目的を達成するために本発明では、回転軸に
固定された磁性材よりなるボスに、交互に極性を異にす
る偶数個の永久磁石を放射状に突設してこの永久磁石の
外端面が露呈するように前記ボスと永久磁石とを覆う非
磁性材よりなる保持部材を設け、一対の非磁性材よりな
る軸受部材をこの保持部材の軸線方向両側に隣接して前
記回転軸に回転自在に軸承させるとともに、前記永久磁
石および保持部材を囲むように筒状に形成され磁性材よ
りなる筒体を、前記軸受部材の外周面に固定し、この筒
体と前記永久磁石の外端面との間に磁性粉粒を介在させ
た。[Means for Solving the Problem] In order to achieve such an object, in the present invention, an even number of permanent magnets having alternately different polarities are arranged radially on a boss made of a magnetic material fixed to a rotating shaft. A holding member made of a non-magnetic material is provided to cover the boss and the permanent magnet so that the outer end surface of the permanent magnet is exposed, and a pair of bearing members made of a non-magnetic material are attached to both sides of the holding member in the axial direction. A cylindrical body made of a magnetic material and formed into a cylindrical shape so as to surround the permanent magnet and the holding member is rotatably supported on the rotating shaft adjacent to the cylindrical member, and the cylindrical body Magnetic powder was interposed between the body and the outer end surface of the permanent magnet.
永久磁石による磁束が、永久磁石−磁性粉粒筒体一磁性
粉粒−永久磁石−ボスとい
う径路で形成され、磁性粉粒を高密度で通るので強力な
磁場が形成され、小形の永久磁石を使用しても大きなト
ルクが得られる。The magnetic flux from the permanent magnet is formed along the path permanent magnet - magnetic powder cylinder - magnetic powder - permanent magnet - boss, and as it passes through the magnetic powder at high density, a strong magnetic field is formed, and the small permanent magnet is Even when used, a large amount of torque can be obtained.
第１図および第２図は本発明に係るトルクリミッタの実
施例を示し、第１図は上半部のみを破断して示す正面図
、第２図は第１図の■−■断面図である。これらの図に
おいて、回転軸１には磁性材よりなるボス２がセレーシ
ョン嵌合等により圧入固定されており、このボス２の外
周面を円周方向に等分する箇所に形成された各凹部２Ａ
には、同径、同長の円柱状に形成され交互に磁性を異に
する偶数個、本実施例の場合４個の永久磁石３が、内端
面３ａを接着等で固着されて放射状に突出されている。1 and 2 show an embodiment of the torque limiter according to the present invention, FIG. 1 is a front view with only the upper half cut away, and FIG. 2 is a sectional view taken along the line ■-■ of FIG. 1. be. In these figures, a boss 2 made of a magnetic material is press-fitted and fixed to a rotating shaft 1 by serration fitting, etc., and each recess 2A is formed at a location that equally divides the outer circumferential surface of this boss 2 in the circumferential direction.
, an even number of permanent magnets 3 (four in this example), which are formed in a cylindrical shape with the same diameter and the same length and alternately have different magnetic properties, are fixed to the inner end surface 3a by adhesive etc. and protrude radially. has been done.
符号４で示すものは、永久磁石３と嵌合する断面半円形
の凹部４Ａを有し永久磁石３の外端面３ｂが露呈するよ
うにボス２と永久磁石３とを覆う一対の保持部材として
の保持体であって、永久磁石３の両側に隣接して回転軸
１上に固着されており、この保持体４は、樹脂あるいは
ステンレススチールなど所要の機械強度を有する非磁性
材で形成されている。そして、この保持体４と、これで
覆われた前記ボス２および永久磁石３とで内側回転体へ
が形成されている。The one designated by reference numeral 4 has a concave portion 4A having a semicircular cross section that fits into the permanent magnet 3, and serves as a pair of holding members that cover the boss 2 and the permanent magnet 3 so that the outer end surface 3b of the permanent magnet 3 is exposed. The holding body 4 is fixed on the rotating shaft 1 adjacent to both sides of the permanent magnet 3, and the holding body 4 is made of a non-magnetic material having the required mechanical strength such as resin or stainless steel. . The holding body 4, the boss 2 covered with the holding body 4, and the permanent magnet 3 form an inner rotating body.
内側回転体Ａの軸線方向両側には、非磁性材で環状に形
成された一対の軸受部材５が回転軸１に回転自在に軸承
されていて、これら軸受部材５の円周方向外側には、磁
性材により内側回転体Ａと同心の円筒状に形成された筒
体Ｂが、内周面を軸受部材５の外周面に固着されて設け
られており、この筒体Ｂと永久磁石３との間に形成され
た環状のすき間には、所要量の磁性粉粒６が介在されて
いる。なお、永久磁石３の外端面３ｂは軸受部材５の外
周面に対してわずかに陥没した状態に形成されており、
磁性粉粒６はこの陥没部を主体にして高密度で介在され
ている。そして本実施例においては、保持体４と軸受部
材５との間にフェルト等により環状に形成されたシール
板７が介挿されており、前記磁性粉粒６の一部が、環状
片４と埋板５との間に侵入しないように構成されている
。On both sides in the axial direction of the inner rotating body A, a pair of annular bearing members 5 made of a non-magnetic material are rotatably supported on the rotating shaft 1, and on the outer side in the circumferential direction of these bearing members 5, A cylindrical body B made of a magnetic material and concentric with the inner rotating body A is provided with its inner circumferential surface fixed to the outer circumferential surface of the bearing member 5. A required amount of magnetic powder particles 6 are interposed in the annular gap formed therebetween. Note that the outer end surface 3b of the permanent magnet 3 is formed in a slightly depressed state with respect to the outer peripheral surface of the bearing member 5.
The magnetic powder particles 6 are interposed at a high density mainly in this depression. In this embodiment, an annular sealing plate 7 made of felt or the like is inserted between the holder 4 and the bearing member 5, and a part of the magnetic powder particles 6 are connected to the annular piece 4. It is configured so that it does not enter between it and the buried board 5.
以上のように構成されたトルクリミッタの動作を説明す
る。回転軸１を回転させると、これと−体の永久磁石３
と磁性材で形成されたボス２および保持体４からなる内
側回転体Ａが回転し、この回転は、磁性粉粒６の粒子間
結合力で筒体Ｂと内側回転体Ａとが磁気吸着されること
により筒体Ｂに伝達されて筒体Ｂが軸受部材５とともに
回転するので、この回転が従動側に伝達される。この場
合図に符号Φで示す永久磁石の磁束は、永久磁石３−磁
性粉粒６−−筒体Ｂ−磁性粉粒６永久磁石３−ボス２と
いう径路で形成され、磁性粉粒６を高密度で通るので、
強力な磁場が形成され、小形の永久磁石を使用しても大
きなトルクが得られる。The operation of the torque limiter configured as above will be explained. When the rotating shaft 1 is rotated, a permanent magnet 3
An inner rotating body A consisting of a boss 2 and a holding body 4 made of a magnetic material rotates, and this rotation is caused by magnetic adsorption between the cylinder B and the inner rotating body A due to the interparticle bonding force of the magnetic powder particles 6. As a result, the rotation is transmitted to the cylindrical body B, and the cylindrical body B rotates together with the bearing member 5, so that this rotation is transmitted to the driven side. In this case, the magnetic flux of the permanent magnet, indicated by the symbol Φ in the figure, is formed along the path permanent magnet 3 - magnetic powder 6 - cylinder B - magnetic powder 6 permanent magnet 3 - boss 2, which makes the magnetic powder 6 highly Because it passes by density,
A strong magnetic field is created and large torque can be obtained even with small permanent magnets.
なお、前記内側回転体Δは、予め製作したボス２を鋳く
るんだ保持体４の所定位置に孔を設けてこの孔に永久磁
石３を埋め込むようにしてもよい。In addition, the inner rotating body Δ may have a hole provided at a predetermined position in a holding body 4 in which a previously produced boss 2 is cast, and the permanent magnet 3 may be embedded in this hole.
また、筒体Ｂは外周面をゴム層等で形成し、これをその
まＸ例えば複写機の紙送りローラ等にしてもよい。さら
に、永久磁石３は必ずしも円柱状に形成する必要はなく
、適宜寸法のブロック状に形成してもよい。Further, the outer peripheral surface of the cylindrical body B may be formed of a rubber layer or the like, and this may be used as it is, for example, as a paper feed roller of a copying machine. Furthermore, the permanent magnet 3 does not necessarily have to be formed in a cylindrical shape, but may be formed in a block shape of an appropriate size.
なおまた、本実施例ではトルクリミッタを回転伝達用の
クラッチに適用した例を示したが、筒体Ｂを機器側に固
定して所定値基」二の負荷がかかるまでは回転軸１が回
転しないように停止させておくブレーキに適用してもよ
い。Furthermore, although this embodiment shows an example in which the torque limiter is applied to a rotation transmission clutch, the rotating shaft 1 does not rotate until the cylinder B is fixed to the equipment side and a predetermined load is applied. It may also be applied to brakes that stop the vehicle from occurring.
（発明の効果〕
以上の説明により明らかなように、本発明によれば、ト
ルクリミッタにおいて、回転軸に固定された磁性材より
なるボスに、交互に極性を異にする偶数個の永久磁石を
放射状に突設してこの永久磁石の外端面が露呈するよう
に前記ボスと永久磁石とを覆う非磁性材よりなる保持部
材を設け、対の非磁性材よりなる軸受部材をこの保持部
材の軸線方向両側に隣接して前記回転軸に回転自在に軸
承させるとともに、前記永久磁石および保持部材を囲む
ように筒状に形成され磁性材よりなる筒体を、前記軸受
部材の外周面に固定し、この筒体と前記永久磁石の外端
面との間に磁性粉粒を介在させたことにより、磁束が、
永久磁石−磁性粉粒−筒体−磁性粉粒一永久磁石−ボス
という径路で形成され磁性粉粒を高密度で通るので、強
力な磁力が形成され、常に安定した回転トルクの伝達が
得られる。この結果、小形の永久磁石を使用しても大き
な回転トルクの伝達を行うことが可能になって構造の筒
素化と小形、軽量化がはかれる。そしてこれを例えば複
写機の紙送りに使用した場合、紙送りがきわめて円滑に
行われるし、紙がつかえた場合その負荷の増大によって
トルクの伝達が遮断できるので、無駄な紙の破損や関連
各部の破損を確実に防止できる。また永久磁石の個数を
変えることにより、トルク設定値の異なった製品が容易
に得られるなど多くの利点がある。(Effects of the Invention) As is clear from the above description, according to the present invention, in a torque limiter, an even number of permanent magnets having alternately different polarities are attached to a boss made of a magnetic material fixed to a rotating shaft. A holding member made of a non-magnetic material is provided that protrudes radially and covers the boss and the permanent magnet so that the outer end surface of the permanent magnet is exposed, and a pair of bearing members made of a non-magnetic material is aligned with the axis of the holding member. A cylindrical body made of a magnetic material and formed into a cylindrical shape so as to surround the permanent magnet and the holding member is fixed to the outer circumferential surface of the bearing member, and is rotatably supported on the rotating shaft adjacent to both sides in the direction; By interposing magnetic powder particles between this cylindrical body and the outer end surface of the permanent magnet, the magnetic flux is
It is formed by a path called permanent magnet - magnetic powder - cylinder - magnetic powder - permanent magnet - boss, and passes through the magnetic powder at high density, so a strong magnetic force is formed and stable rotational torque transmission is always obtained. . As a result, even if a small permanent magnet is used, it is possible to transmit a large rotational torque, and the structure can be made into a cylindrical structure, and the structure can be made smaller and lighter. If this is used, for example, to feed paper in a copying machine, the paper will be fed extremely smoothly, and if the paper gets stuck, the torque transmission will be cut off due to the increased load, preventing unnecessary damage to the paper and related parts. Damage to the product can be reliably prevented. Furthermore, by changing the number of permanent magnets, there are many advantages such as the ability to easily obtain products with different torque settings.
【図面の簡単な説明】
第１図および第２図は本発明に係るトルクリミッタの実
施例を示し、第１図は上半部のみを破断して示す正面図
、第２図は第１図の■−■断面図である。
１・・・・回転軸、２・・・・ボス、３・・・・永久磁
石、４・・・・保持体、５・・・・軸受部材、６・・・
・磁性粉粒、Ａ・・・・内側回転体、Ｂ・・・・筒体。[Brief Description of the Drawings] Figures 1 and 2 show an embodiment of the torque limiter according to the present invention, with Figure 1 being a front view with only the upper half cut away, and Figure 2 being the same as Figure 1. It is a sectional view taken along ■-■. DESCRIPTION OF SYMBOLS 1...Rotating shaft, 2...Boss, 3...Permanent magnet, 4...Holder, 5...Bearing member, 6...
・Magnetic powder particles, A: inner rotating body, B: cylinder.
Claims (1)
内端面が固着されて放射状に突出し交互に極性を異にす
る偶数個の永久磁石と、この永久磁石の外端面が露呈す
るように前記ボスと永久磁石を覆う非磁性材よりなる保
持部材と、この保持部材の軸線方向両側に隣接して前記
回転軸に回転自在に軸承された一対の非磁性材よりなる
軸受部材と、前記永久磁石および保持部材を囲むように
筒状に形成され前記軸受部材の外周面に固定された磁性
材よりなる筒体と、この筒体と前記永久磁石の外端面と
の間に介在する磁性粉粒とを備えたことを特徴とするト
ルクリミッタ。A boss made of a magnetic material fixed to a rotating shaft, an even number of permanent magnets whose inner end surfaces are fixed to the boss and protrude radially and alternately have different polarities, and an outer end surface of the permanent magnets that is exposed. a holding member made of a non-magnetic material that covers the boss and the permanent magnet; a pair of bearing members made of a non-magnetic material adjacent to both sides of the holding member in the axial direction and rotatably supported on the rotating shaft; A cylindrical body made of a magnetic material formed in a cylindrical shape to surround a magnet and a holding member and fixed to the outer peripheral surface of the bearing member, and magnetic powder particles interposed between the cylindrical body and the outer end surface of the permanent magnet. A torque limiter characterized by being equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29609089A JPH02266116A (en) | 1989-11-16 | 1989-11-16 | Torque limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29609089A JPH02266116A (en) | 1989-11-16 | 1989-11-16 | Torque limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02266116A true JPH02266116A (en) | 1990-10-30 |
Family
ID=17828993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29609089A Pending JPH02266116A (en) | 1989-11-16 | 1989-11-16 | Torque limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02266116A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS507392U (en) * | 1973-05-17 | 1975-01-25 | ||
| JPS56143855A (en) * | 1980-04-10 | 1981-11-09 | Ricoh Co Ltd | Instanteneous feeding mechanism |
| JPS56150649A (en) * | 1980-03-27 | 1981-11-21 | Siemens Ag | Magnetocoupling |
-
1989
- 1989-11-16 JP JP29609089A patent/JPH02266116A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS507392U (en) * | 1973-05-17 | 1975-01-25 | ||
| JPS56150649A (en) * | 1980-03-27 | 1981-11-21 | Siemens Ag | Magnetocoupling |
| JPS56143855A (en) * | 1980-04-10 | 1981-11-09 | Ricoh Co Ltd | Instanteneous feeding mechanism |
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