JPH09106910A - Resin magnet assembly - Google Patents
Resin magnet assemblyInfo
- Publication number
- JPH09106910A JPH09106910A JP30722596A JP30722596A JPH09106910A JP H09106910 A JPH09106910 A JP H09106910A JP 30722596 A JP30722596 A JP 30722596A JP 30722596 A JP30722596 A JP 30722596A JP H09106910 A JPH09106910 A JP H09106910A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- resin magnet
- shaft member
- core
- cylindrical resin
- 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
- 229920005989 resin Polymers 0.000 title claims abstract description 67
- 239000011347 resin Substances 0.000 title claims abstract description 67
- 239000000843 powder Substances 0.000 claims abstract description 9
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 150000002910 rare earth metals Chemical class 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000001746 injection moulding Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 10
- 238000005336 cracking Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 102200082907 rs33918131 Human genes 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種機器の回転数・回
転速度を検出するために使われるセンサーにおける当該
構成部品として用いられる磁石組立品に関して、特にＯ
Ａ機器等の静的かつ常温環境下で使用される場合に比べ
て振動、熱又は強度に対して耐久性が要求される自動車
等の回転センサーにおいて、遠距離検知を可能せしめる
磁石組立品を提供する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet assembly used as a component in a sensor used for detecting the number of rotations and rotation speeds of various devices, and more particularly to a magnet assembly used as a component.
Providing a magnet assembly that enables long-distance detection in a rotation sensor of an automobile or the like that requires durability against vibration, heat, or strength compared to when used in a static and normal temperature environment such as A equipment I do.
【０００２】[0002]
【従来の技術】近年、自動車等の速度検出装置において
機械的なケーブル等の回転を介して速度を検出する方法
あるいはギアを介して回転数を検出する方法から、永久
磁石の磁気を検知するセンサを使用する電子検出装置に
変わりつつある。この電子検出装置において、遠距離検
知を可能せしめる磁石組立品として焼結フェライト磁
石、フェライト磁石樹脂成形体あるいは焼結Ｓｍ−Ｃｏ
磁石があげられている。しかし、焼結フェライト磁石を
用いる場合には当該磁石の割れ、欠けの問題とともに磁
束密度が低いため遠距離検知は困難であった。また、フ
ェライト磁石樹脂成形体を用いる場合には、当該磁石の
割れ、欠けの問題は解決されるものの磁束密度が低いた
め遠距離検知は困難であった。2. Description of the Related Art In recent years, a sensor for detecting the magnetism of a permanent magnet has been selected from a method of detecting a speed via rotation of a mechanical cable or the like or a method of detecting a rotation speed via a gear in a speed detecting device of an automobile or the like. It is changing to an electronic detection device that uses. In this electron detection device, a sintered ferrite magnet, a ferrite magnet resin molded product, or a sintered Sm-Co
A magnet is given. However, when a sintered ferrite magnet is used, it is difficult to detect a long distance because the magnetic flux density is low as well as cracking and chipping of the magnet. Further, when a ferrite magnet resin molded body is used, the problem of cracking and chipping of the magnet is solved, but long-distance detection is difficult due to low magnetic flux density.
【０００３】この遠距離検知を可能とするために磁束密
度の高い焼結Ｓｍ−Ｃｏ磁石を用いた磁石組立品が多く
使用されるている。例えば、図５に示すように、磁気セ
ンサーＳと高速回転する焼結磁石組立品50とを用いたも
のが知られている。この焼結磁石組立品50は、円柱状の
焼結Ｓｍ−Ｃｏ磁石51、ケーシング52およびフランジ部
53を有する軸部54からなっている。[0003] In order to enable this long distance detection, a magnet assembly using a sintered Sm-Co magnet having a high magnetic flux density is often used. For example, as shown in FIG. 5, one using a magnetic sensor S and a sintered magnet assembly 50 rotating at high speed is known. The sintered magnet assembly 50 includes a cylindrical sintered Sm-Co magnet 51, a casing 52, and a flange portion.
It comprises a shank 54 having 53.
【０００４】しかし、この焼結磁石組立品50は製造過程
における焼結Ｓｍ−Ｃｏ磁石の割れ、欠けが発生するた
めに製品歩留りが低い、寸法精度が悪い、および部品点
数が多い、そして組み付け性が悪いなどの欠点があっ
た。例えば、円柱状の焼結Ｓｍ−Ｃｏ磁石51の製造にお
いては焼結後に所定の寸法に機械加工する際に、もしく
は工程途上においても同様に割れ、欠けの問題が発生す
る。さらに、焼結磁石組立品50は、回転部品として用い
る際に焼結磁石が割れたり、欠けたりすることを防ぐた
めにケーシング52を必要とおり、このケーシング52と焼
結Ｓｍ−Ｃｏ磁石51との接合には、かしめたり、接着剤
で固定している。かしめの場合には焼結Ｓｍ−Ｃｏ磁石
51が割れたり、接着の場合には剥離したりして強度上の
問題がある。また、焼結磁石組立品が高速回転する時に
フランジ部53の端面から焼結Ｓｍ−Ｃｏ磁石51とケーシ
ング52からなる２部品が剥離することを防止するため
に、焼結Ｓｍ−Ｃｏ磁石51とケーシング52とを固定した
２部品をフランジ部53の端面に接着剤で固定するために
接着剤が塗布されるフランジ部53の端面に滑り止め加工
等を施す工程が必要である。他方、焼結Ｓｍ−Ｃｏ磁石
51の外径にケーシング52を配設するため、焼結Ｓｍ−Ｃ
ｏ磁石の表面と磁気センサーＳとの距離が離れることに
より検出できる磁束密度が低下する。However, this sintered magnet assembly 50 has a low product yield due to cracking and chipping of the sintered Sm-Co magnet in the manufacturing process, poor dimensional accuracy, and a large number of parts, and assemblability. There was a defect such as bad. For example, in the production of the cylindrical sintered Sm-Co magnet 51, the problem of cracking or chipping similarly occurs during machining into a predetermined size after sintering or during the process. Further, the sintered magnet assembly 50 requires a casing 52 in order to prevent the sintered magnet from cracking or chipping when used as a rotating component. The casing 52 and the sintered Sm-Co magnet 51 are joined together. It is caulked or fixed with an adhesive. Sintered Sm-Co magnet for caulking
There is a problem in strength because 51 cracks or peels off in the case of adhesion. Further, in order to prevent the two parts including the sintered Sm-Co magnet 51 and the casing 52 from peeling from the end surface of the flange portion 53 when the sintered magnet assembly rotates at a high speed, the sintered Sm-Co magnet 51 and In order to fix the two parts to which the casing 52 is fixed to the end surface of the flange portion 53 with an adhesive, it is necessary to perform a step of applying slip prevention to the end surface of the flange portion 53 to which the adhesive is applied. On the other hand, sintered Sm-Co magnet
Since the casing 52 is arranged on the outer diameter of 51, the sintered Sm-C
o When the distance between the surface of the magnet and the magnetic sensor S increases, the detectable magnetic flux density decreases.
【０００５】本発明の目的は、遠距離検知を可能にする
とともに製造過程における磁石の割れ、欠けによる製造
歩留の低下を防止し、部品点数が少なく組付け性の良好
な磁石組立品を提供するものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet assembly which enables long-distance detection, prevents a decrease in manufacturing yield due to cracking or chipping of a magnet in a manufacturing process, and has a small number of parts and a good assembling property. Is what you do.
【０００６】[0006]
【課題を解決するための手段】本発明にかかる樹脂磁石
組立品の永久磁石粉末として、希土類系永久磁石粉末と
熱可塑性樹脂を主成分とした円筒状樹脂磁石と、その内
周部にシャフト部材を有する一体成形した樹脂磁石組立
品において、前記シャフト部材は芯部および軸部からな
り当該芯部がヨーク機能を有する金属材料からなること
を特徴としている。As the permanent magnet powder of the resin magnet assembly according to the present invention, a cylindrical resin magnet mainly composed of a rare earth permanent magnet powder and a thermoplastic resin, and a shaft member provided on the inner periphery thereof. Wherein the shaft member comprises a core portion and a shaft portion, and the core portion is made of a metal material having a yoke function.
【０００７】すなわち、本発明の円筒状樹脂磁石には、
Ｓｍ−Ｃｏ系、Ｎｄ−Ｆｅ−Ｂ系等の希土類系永久磁石
粉末が用いられる。また、熱可塑性樹脂としては、ナイ
ロン、ポリプロピレン等が用いられる。希土類系永久磁
石粉末と熱可塑性樹脂を主成分とした組成物を、先に金
型に挿入してあるシャフト部材に対して射出成形を行
い、円筒状樹脂磁石を形成するとともに当該シャフト部
材と一体成形をする。次いで、円筒状樹脂磁石に多極性
を有するためにラジアル着磁を行う。That is, the cylindrical resin magnet of the present invention includes:
Rare earth permanent magnet powders such as Sm-Co and Nd-Fe-B are used. In addition, nylon, polypropylene, or the like is used as the thermoplastic resin. A composition mainly composed of a rare earth permanent magnet powder and a thermoplastic resin is injection-molded onto a shaft member previously inserted into a mold to form a cylindrical resin magnet and be integrated with the shaft member. Do molding. Next, radial magnetization is performed so that the cylindrical resin magnet has multipolarity.
【０００８】本発明に用いられるシャフト部材の芯部に
は、ヨーク機能を有する金属材料、例えばＳ１０Ｃや軟
磁性ステンレス鋼などが用いられる。ここで、ヨーク機
能とは、磁石のパーミアンス係数を上昇させることによ
り、磁石表面の磁束密度をあげる増幅機能をいう。な
お、これらのヨーク機能を有する金属材料をシャフト部
材芯部に用いる場合には、ヨーク機能を有するシャフト
部材芯部の外周と接する円筒状樹脂磁石の内周が隙間を
全くない状態に接合することが必要である。また、ヨー
ク機能を有効に作用させるためには、円筒状樹脂磁石の
厚さはシャフト部材芯部の厚さに対して薄く設定する方
がよい。従って、シャフト部材の芯部の外径より軸部の
外径は小さくなるのが普通である。For the core of the shaft member used in the present invention, a metal material having a yoke function, for example, S10C or soft magnetic stainless steel is used. Here, the yoke function refers to an amplification function that increases the magnetic flux density on the magnet surface by increasing the permeance coefficient of the magnet. When the metal material having the yoke function is used for the shaft member core, the inner periphery of the cylindrical resin magnet in contact with the outer periphery of the shaft member core having the yoke function should be joined without any gap. is required. In order to make the yoke function work effectively, it is better to set the thickness of the cylindrical resin magnet thinner than the thickness of the shaft member core. Therefore, the outer diameter of the shaft portion is generally smaller than the outer diameter of the core portion of the shaft member.
【０００９】さらに、本発明は当該シャフト部材の形状
において、特に芯部外周の形状については１または２以
上のテーパーを有することを特徴とする。つまり、２の
連続した山形からなり芯部中心線に対して開放型もしく
は閉鎖型の２のテーパーを有することを特徴とする。ま
た、３以上の波形テーパーでもよい。その連続する山形
の頂点は円弧を有していてもよい。芯部外周の形状とし
ては、外周の一部又は全周にわたってキー溝を設けても
よい。Further, the present invention is characterized in that the shape of the shaft member, in particular, the shape of the outer periphery of the core portion has one or more tapers. That is, it is characterized by having two continuous chevron shapes and two open or closed tapers with respect to the center line of the core. Also, three or more waveform tapers may be used. The vertices of the continuous chevron may have an arc. As the shape of the outer periphery of the core portion, a key groove may be provided over a part or the entire periphery of the outer periphery.
【００１０】[0010]
【作用および効果】本発明のように、希土類系永久磁石
粉末と熱可塑性樹脂を主成分とする組成物を、先に金型
に挿入したヨーク機能をも有する芯部からなる当該シャ
フト部材に射出成形をおこなって一体成形することによ
り、焼結磁石を用いないために割れ、欠けの問題は発生
せず、製造歩留も向上する。また、部品点数は円筒状樹
脂磁石の一体成形部品の１点と減少し、組み付け性も大
幅に改善される。Function and Effect As in the present invention, a composition mainly composed of a rare-earth permanent magnet powder and a thermoplastic resin is injected into a shaft member having a core part also having a yoke function and previously inserted into a mold. By performing molding and integrally forming, the problem of cracking and chipping does not occur because a sintered magnet is not used, and the production yield is improved. Further, the number of parts is reduced to one point of the integrally molded part of the cylindrical resin magnet, and the assemblability is greatly improved.
【００１１】さらに、円筒状樹脂磁石の内周部に配設さ
れている芯部がヨーク機能を有するために当該円筒状樹
脂磁石の外周表面の磁束密度が増幅されることにより、
遠距離検知が可能となる。すなわち、芯部にヨーク機能
を付加することにより、当該円筒状樹脂磁石の外周表面
からの距離が遠く離れている場合においても、磁気セン
サーで検知できる磁束密度が改善されている。なお、円
筒状樹脂磁石の内周部にヨーク機能を有する芯部の配設
の際に、円筒状樹脂磁石の内周面とヨーク機能を有する
芯部の外周面が完全に密接されずに間隙を有すると、ヨ
ーク機能が激減するために当該円筒状樹脂磁石の外周表
面の磁束密度の増幅がなされず、従って磁気センサーで
検知できる磁束密度は改善されない。Further, since the core provided on the inner peripheral portion of the cylindrical resin magnet has a yoke function, the magnetic flux density on the outer peripheral surface of the cylindrical resin magnet is amplified,
Long-distance detection becomes possible. That is, by adding the yoke function to the core, the magnetic flux density that can be detected by the magnetic sensor is improved even when the distance from the outer peripheral surface of the cylindrical resin magnet is long. When the core having the yoke function is provided on the inner peripheral portion of the cylindrical resin magnet, the inner peripheral surface of the cylindrical resin magnet and the outer peripheral surface of the core having the yoke function are not completely in close contact with each other. With this, the yoke function is drastically reduced, so that the magnetic flux density on the outer peripheral surface of the cylindrical resin magnet is not amplified, so that the magnetic flux density detectable by the magnetic sensor is not improved.
【００１２】また、この作用から、当該円筒状樹脂磁石
の外周表面と磁気センサーの距離が小さい場合には、当
該円筒状樹脂磁石の厚さを薄くすることができ、高価な
希土類系永久磁石粉末の使用を少なくできる効果が得ら
れる。Further, from this effect, when the distance between the outer peripheral surface of the cylindrical resin magnet and the magnetic sensor is small, the thickness of the cylindrical resin magnet can be reduced, and the expensive rare earth permanent magnet powder can be used. The effect which can reduce use of is obtained.
【００１３】さらに、本発明の芯部の外周に２以上のテ
ーパー、キー溝を設けたので、当該円筒状樹脂磁石と当
該芯部との間における物理的結合に加えて機械構造的結
合が生ずるため、円筒状樹脂磁石とシャフト部材が一層
強固に結合することにより、樹脂磁石組立品の振動、熱
での使用環境下もしくは高速回転時に円筒状樹脂磁石が
当該シャフト材から抜け落ちたり、空回りすることに対
して、さらにその性能を向上することができる。Further, since two or more tapers and key grooves are provided on the outer periphery of the core portion of the present invention, mechanical structural coupling occurs in addition to physical coupling between the cylindrical resin magnet and the core portion. For this reason, the cylindrical resin magnet and shaft member are more firmly connected, so that the cylindrical resin magnet slips out of the shaft material or idles when the resin magnet assembly is used under vibration, heat, or high-speed rotation. On the other hand, the performance can be further improved.
【００１４】[0014]
【実施例】次に本発明の実施例について説明する。実施
例１を図１、図２および図３に示すとともに以下に説明
する。図１に示すように、芯部12にヨーク機能を有する
Ｓ１０Ｃからシャフト部材を切削加工にて作製した。円
筒状樹脂磁石10の目標とする成形寸法は外径が８．００
ｍｍ、内径が４．００ｍｍ、そして、円筒状樹脂磁石12
の厚さは２．００ｍｍ、幅Ｗは６．００ｍｍとした。シ
ャフト部材を構成する芯部12の寸法は円筒状樹脂磁石11
の内径との接合面の外径は４．０ｍｍ、幅は６．０ｍｍ
とした。軸部13の寸法は外径３．００ｍｍ、長さ２５ｍ
ｍとした。Next, an embodiment of the present invention will be described. Embodiment 1 is described below with reference to FIGS. 1, 2 and 3. FIG. As shown in FIG. 1, a shaft member was manufactured by cutting from S10C having a yoke function in the core portion 12. The target molding size of the cylindrical resin magnet 10 is 8.00 in outer diameter.
mm, the inner diameter is 4.00 mm, and the cylindrical resin magnet 12
Had a thickness of 2.00 mm and a width W of 6.00 mm. The size of the core 12 constituting the shaft member is cylindrical resin magnet 11
The outer diameter of the joint surface with the inner diameter is 4.0 mm and the width is 6.0 mm
And The dimensions of the shaft 13 are 3.00 mm in outer diameter and 25 m in length
m.
【００１５】次いで、重量比で、希土類永久磁石粉末
（商品名ＭＱ１、米国 General Motors Corporation
製）を８８ｗｔ％〜９２ｗｔ％、残りを熱可塑性樹脂お
よび添加剤からなるペレット（商品名ＲＮＩ−１２５
５、メイト社製）を用いて当該シャフト部材に対して射
出温度２７０℃、射出圧力１５００ｋｇｆ／ｃｍ2 にて
成形し、５．１ｇ／ｃｍ3 の密度を有する成形体が得ら
れた。Next, in terms of weight ratio, rare earth permanent magnet powder (trade name: MQ1, US General Motors Corporation)
(Made by RNI-125) of a thermoplastic resin and an additive.
5, manufactured by Mate Co., Ltd.) and molded at an injection temperature of 270 ° C. and an injection pressure of 1500 kgf / cm 2 to obtain a molded body having a density of 5.1 g / cm 3 .
【００１６】射出成形時の割れは、５００個成形したと
ころ全く発生せず、芯部の外周 12aと円筒状樹脂磁石の
内周 11bとの接合面は隙間もなく完全な一体成形体が得
られた。また、シャフトの軸13を回転試験装置に組み付
けて１０００〜３０００ｒｐｍの回転試験においても円
筒状樹脂磁石11の空回り、あるいは脱落、欠けの問題は
発生しなかった。No cracks occurred during injection molding when 500 pieces were molded, and a completely integrated molded body was obtained with no gap between the outer periphery 12a of the core and the inner periphery 11b of the cylindrical resin magnet. . Further, even in a rotation test at 1000 to 3000 rpm by attaching the shaft 13 of the shaft to a rotation test apparatus, no problem of idling, falling off, or chipping of the cylindrical resin magnet 11 occurred.
【００１７】図１に示す成形体に８極のラジアル着磁を
処理してヨーク機能の効果を調査しその結果を図４に示
す。成形体へのラジアル着磁条件は、着磁電圧１０００
〜１５００Ｖ、着磁電流１００００〜２００００Ａで着
磁した。こうして得られた樹脂磁石組立体10を用い、当
該円筒状樹脂磁石の外周表面 11aから磁気センサーＳま
での距離として１．０〜６．０ｍｍについて、磁束密度
の片側のピーク値を測定した。なお、測定は樹脂磁石組
立体10を１８００ｒｐｍの回転を与えて行なった。The molded body shown in FIG. 1 was subjected to eight-pole radial magnetization to investigate the effect of the yoke function, and the results are shown in FIG. The radial magnetizing condition for the molded body is a magnetizing voltage of 1000
It was magnetized at ~ 1500 V and a magnetizing current of 10,000 to 20,000 A. Using the resin magnet assembly 10 thus obtained, a peak value on one side of the magnetic flux density was measured for a distance from the outer peripheral surface 11a of the cylindrical resin magnet to the magnetic sensor S of 1.0 to 6.0 mm. The measurement was performed by rotating the resin magnet assembly 10 at 1800 rpm.
【００１８】比較例として、ヨーク機能を有しない樹脂
磁石組立体にはＪＩＳ鋼のＳＵＳ３０４からなり、本発
明の樹脂磁石組立体10と同一の寸法に加工したシャフト
部材を用い、樹脂磁石組立体10の作製と同一条件による
円筒状樹脂磁石を射出成形した後、８極にラジアル着磁
して測定に供した。As a comparative example, a resin magnet assembly having no yoke function is made of SUS304 made of JIS steel, and a shaft member processed to the same dimensions as the resin magnet assembly 10 of the present invention is used. After injection molding of a cylindrical resin magnet under the same conditions as in the preparation of the above, radial magnetization was performed on eight poles and the sample was subjected to measurement.
【００１９】また、従来例として、図５に示した樹脂組
立品50を用いた。焼結Ｓｍ−Ｃｏ磁石51の外径は５．８
０ｍｍ、高さは６．００ｍｍとし、ケーシング52は内径
６．００ｍｍ、外径８．００ｍｍの金属Ａｌパイプを長
さ６．００ｍｍに切断したパイプとした。この磁石組立
体50を測定に供した。As a conventional example, the resin assembly 50 shown in FIG. 5 was used. The outer diameter of the sintered Sm-Co magnet 51 is 5.8.
The casing 52 was a metal Al pipe having an inner diameter of 6.00 mm and an outer diameter of 8.00 mm cut into a length of 6.00 mm. This magnet assembly 50 was subjected to measurement.
【００２０】図４には、横軸として当該円筒状樹脂磁石
の外周表面 11aから磁気センサーＳまでの距離を１．０
〜６．０ｍｍをとり、縦軸として磁気センサーＳで検知
した磁束密度（Ｇ；ガウス）を表した。これから、距離
が大きくなるに従って磁束密度は低下する傾向が見られ
る。しかし、芯部にヨーク機能を有していない比較例に
比べて、芯部にヨーク機能を有する本発明の樹脂磁石組
立体10の場合、全ての距離において改善され、高磁束密
度が得られている。このことから、ヨーク機能を付加す
ることにより遠距離検知が可能である。また、ヨーク機
能を付加することにより従来の焼結Ｓｍ−Ｃｏ磁石を用
いた磁石組立体以上の性能が得られた。In FIG. 4, the distance from the outer peripheral surface 11a of the cylindrical resin magnet to the magnetic sensor S is 1.0 as the horizontal axis.
The vertical axis represents the magnetic flux density (G; Gauss) detected by the magnetic sensor S as a vertical axis. From this, it can be seen that the magnetic flux density tends to decrease as the distance increases. However, compared to the comparative example in which the core does not have the yoke function, in the case of the resin magnet assembly 10 of the present invention having the yoke function in the core, it is improved at all distances, and a high magnetic flux density is obtained. I have. From this, it is possible to detect a long distance by adding a yoke function. Further, by adding the yoke function, performances higher than those of the magnet assembly using the conventional sintered Sm-Co magnet were obtained.
【００２１】次に、シャフト部材の芯部の形状を変えた
樹脂磁石成形体の実施例について、２のテーパーからな
る芯部を有する実施例２を図２に示し、そして芯部外周
の周囲にキー溝を有する実施例３を図３に示す。実施例
２では、シャフト部材の加工において、芯部外周の形状
が２の連続した山形からなり芯部中心線に対してそれぞ
れγ、βの角度（本実施例ではそれぞれ２度）を有して
開放している２のテーパーからなる芯部41を切削加工で
作製した。その寸法は、芯部42の上下端面の外径で４．
００ｍｍ、芯部中央の最小径で３．７９ｍｍ、幅で６．
００ｍｍとした。なお、当該シャフト部材にはフランジ
部を有せず、軸部23の大きさは実施例１と同一とした。
このシャフト部材を用いて射出成形により得られた成形
体の円筒状樹脂磁石41は軸部42の上下の端面で接する寸
法４．００ｍｍに比べて軸部42の中央で接する寸法は
４．２１ｍｍと大きくなるために円筒状樹脂磁石21がシ
ャフト部材芯部22から抜けにくい構造が得られた。Next, with respect to an embodiment of a resin magnet molded body in which the shape of the core portion of the shaft member is changed, FIG. 2 shows an embodiment 2 having a core portion having a taper of two. Embodiment 3 having a key groove is shown in FIG. In the second embodiment, in the processing of the shaft member, the shape of the outer periphery of the core portion is formed of two continuous chevron shapes and has angles of γ and β with respect to the center line of the core portion (each of 2 degrees in the present embodiment). An open core 41 made of two tapers was formed by cutting. Its dimensions are the outer diameter of the upper and lower end surfaces of the core 42.
00 mm, the minimum diameter at the center of the core is 3.79 mm, and the width is 6.79 mm.
00 mm. The shaft member did not have a flange portion, and the size of the shaft portion 23 was the same as that of the first embodiment.
The cylindrical resin magnet 41 of the molded product obtained by injection molding using this shaft member has a dimension of 4.21 mm in contact with the center of the shaft portion 42 compared to 4.00 mm in contact with the upper and lower end surfaces of the shaft portion 42. A structure was obtained in which the cylindrical resin magnet 21 was not easily detached from the shaft member core portion 22 because of its size.
【００２２】実施例３では、シャフト部材の加工におい
て、芯部32の外周にキー溝55を切削加工にて作製した。
すなわち、外径４．００ｍｍ、幅６．００ｍｍから芯部
32のの中央に幅１．５０ｍｍ、深さ０．３０ｍｍの丸み
を有する形状のキー溝35とした。なお、当該シャフト部
材にはフランジ部を有せず、軸部34の大きさは第１実施
例と同一とした。このシャフト部材を用いて射出成形に
より得られた成形体の円筒状樹脂磁石31は円筒状樹脂磁
石31の内径４．００ｍｍに対して内径４．６０ｍｍの凸
部を有することになるため円筒状樹脂磁石31がシャフト
部材芯部32から抜けにくい構造が得られた。In the third embodiment, a key groove 55 is formed on the outer periphery of the core portion 32 by cutting in the processing of the shaft member.
That is, since the outer diameter is 4.00 mm and the width is 6.00 mm,
A keyway 35 having a round shape with a width of 1.50 mm and a depth of 0.30 mm was formed at the center of 32. The shaft member did not have a flange portion, and the size of the shaft portion 34 was the same as that of the first embodiment. Since the cylindrical resin magnet 31 of the molded product obtained by injection molding using the shaft member has a convex portion having an inner diameter of 4.60 mm with respect to the inner diameter of the cylindrical resin magnet 31 of 4.00 mm, the cylindrical resin magnet 31 is formed. A structure was obtained in which the magnet 31 was difficult to be removed from the shaft member core 32.
【００２３】このような２以上テーパーもしくはキー溝
を設けた樹脂磁石組立品を回転試験装置に組み付けて６
０００〜１２０００ｒｐｍの高速回転試験においても空
回りあるいは円筒状樹脂磁石21、又は31の脱落の問題は
生じなかった。さらに、−２０〜１２０℃のヒートサイ
クル試験と高速回転試験との組合せ試験においても空回
りあるいは円筒状樹脂磁石21、又は31の脱落の問題は生
じなかった。The resin magnet assembly provided with such two or more tapered or keyed grooves is assembled in a rotation test apparatus and
Even in the high-speed rotation test at 000 to 12000 rpm, no problem of idling or dropping of the cylindrical resin magnet 21 or 31 occurred. Further, in the combination test of the heat cycle test at −20 to 120 ° C. and the high-speed rotation test, no problem of idling or dropping of the cylindrical resin magnet 21 or 31 occurred.
【００２４】なお、樹脂磁石組立品のシャフト部材の形
状については、本発明の実施例に示した芯部の形状のみ
でなく、非円柱状の形状からなり機械構造的な結合が得
られる形状を含むものである。The shape of the shaft member of the resin magnet assembly is not limited to the shape of the core shown in the embodiment of the present invention, but may be a non-cylindrical shape that can provide mechanical structural coupling. Including.
【図１】実施例１において、樹脂磁石組立品の断面図。FIG. 1 is a sectional view of a resin magnet assembly according to a first embodiment.
【図２】実施例２にかかる樹脂磁石組立品の断面図。FIG. 2 is a cross-sectional view of a resin magnet assembly according to a second embodiment.
【図３】実施例３にかかる樹脂磁石組立品の断面図。FIG. 3 is a sectional view of a resin magnet assembly according to a third embodiment.
【図４】ヨーク機能を付加した効果。FIG. 4 shows the effect of adding a yoke function.
【図５】従来の樹脂磁石組立品の断面図。FIG. 5 is a sectional view of a conventional resin magnet assembly.
１０ ．．．実施例１にかかる樹脂磁石組立品 １１ ．．．円筒状樹脂磁石 １１ａ ．．．円筒状樹脂磁石の外周 １１ｂ ．．．円筒状樹脂磁石の内周 １２ ．．．シャフト部材の芯部 １２ａ ．．．シャフト部材の芯部の外周 １３ ．．．シャフト部材の軸部 Ｓ ．．．磁気センサー ２０ ．．．実施例２にかかる樹脂磁石組立品 ２１ ．．．円筒状樹脂磁石 ２２ ．．．シャフト部材の芯部 ２３ ．．．シャフト部材の軸部 γ ．．．芯部のなす１のテーパーの角度 β ．．．芯部のなす他のテーパーの角度 Ｓ ．．．磁気センサー ３０ ．．．実施例３にかかる樹脂磁石組立品 ３１ ．．．円筒状樹脂磁石 ３２ ．．．シャフト部材の芯部 ３３ ．．．シャフト部材の軸部 ３４ ．．．シャフト部材の凹部 Ｓ ．．．磁気センサー ５１ ・・・焼結Ｓｍ−Ｃｏ磁石 ５２ ・・・ケーシング ５３ ・・・軸部 ５４ ・・・フランジ部 Ｓ ・・・磁気センサー 10. . . Resin magnet assembly according to Example 1 11. . . Cylindrical resin magnet 11a. . . Outer circumference of cylindrical resin magnet 11b. . . Inner circumference of cylindrical resin magnet 12. . . Core part of shaft member 12a. . . Outer circumference of core of shaft member 13. . . Shaft member shaft portion S. . . Magnetic sensor 20. . . 20. Resin magnet assembly according to the second embodiment 21. . . Cylindrical resin magnet 22. . . Core part of shaft member 23. . . Shaft member shaft γ. . . Angle of 1 taper made by the core β. . . Angle of other taper made by core S. . . Magnetic sensor 30. . . Resin magnet assembly according to example 3 31. . . Cylindrical resin magnet 32. . . Core part of shaft member 33. . . Shaft member shaft portion 34. . . Recess of shaft member S. . . Magnetic sensor 51 ... Sintered Sm-Co magnet 52 ... Casing 53 ... Shaft 54 ... Flange S ... Magnetic sensor
Claims (2)
成分とした円筒状樹脂磁石と、その内周部にシャフト部
材を有する一体成形した樹脂磁石組立品において、前記
シャフト部材は芯部および軸部からなり当該芯部がヨー
ク機能を有する金属材料からなることを特徴とする樹脂
磁石組立品。1. An integrally molded resin magnet assembly having a cylindrical resin magnet mainly composed of a rare earth permanent magnet powder and a thermoplastic resin, and a shaft member on an inner periphery thereof, wherein the shaft member has a core and a core. A resin magnet assembly comprising a shaft portion and a core portion made of a metal material having a yoke function.
磁石の内周の接合面において、当該芯部形状が非円柱状
からなることを特徴とする請求項１に記載の樹脂磁石組
立品。2. The resin magnet assembly according to claim 1, wherein the core portion has a non-cylindrical shape at the joint surface between the outer periphery of the core portion of the shaft member and the inner periphery of the cylindrical resin magnet. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30722596A JP2811302B2 (en) | 1996-10-31 | 1996-10-31 | Resin magnet assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30722596A JP2811302B2 (en) | 1996-10-31 | 1996-10-31 | Resin magnet assembly |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4128290A Division JPH07101648B2 (en) | 1992-04-21 | 1992-04-21 | Resin magnet assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09106910A true JPH09106910A (en) | 1997-04-22 |
| JP2811302B2 JP2811302B2 (en) | 1998-10-15 |
Family
ID=17966558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30722596A Expired - Fee Related JP2811302B2 (en) | 1996-10-31 | 1996-10-31 | Resin magnet assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2811302B2 (en) |
-
1996
- 1996-10-31 JP JP30722596A patent/JP2811302B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2811302B2 (en) | 1998-10-15 |
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