JPH01114729A - Distortion detector - Google Patents
Distortion detectorInfo
- Publication number
- JPH01114729A JPH01114729A JP27455587A JP27455587A JPH01114729A JP H01114729 A JPH01114729 A JP H01114729A JP 27455587 A JP27455587 A JP 27455587A JP 27455587 A JP27455587 A JP 27455587A JP H01114729 A JPH01114729 A JP H01114729A
- Authority
- JP
- Japan
- Prior art keywords
- passive shaft
- magnetic layer
- adhesive agent
- annular groove
- adhesive
- 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
- 239000000853 adhesive Substances 0.000 claims abstract description 25
- 230000001070 adhesive effect Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 238000011074 autoclave method Methods 0.000 abstract description 4
- 238000005530 etching Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は歪検出器に関するものである。[Detailed description of the invention] [Industrial application field] This invention relates to a distortion detector.
第２図は従来の歪検出器の構成を示し、１は回転軸から
なる受動軸、２は受動軸１の中心軸、３゜４は受動軸１
を回転自在に支持する軸受である。Figure 2 shows the configuration of a conventional strain detector, where 1 is a passive shaft consisting of a rotating shaft, 2 is the central axis of the passive shaft 1, and 3°4 is the passive shaft 1.
This is a bearing that rotatably supports the
受動軸１の外周には高磁歪材、例えばアモルファス磁性
材からなる第１及び第２の磁性層５．６が固着される。First and second magnetic layers 5.6 made of a highly magnetostrictive material, for example an amorphous magnetic material, are fixed to the outer periphery of the passive shaft 1.
第１の磁性層５は中心軸２に対して＋４５度方向に、第
２の磁性層６は中心軸２に対して一４５度方向にそれぞ
れ細長く複数条形成（シェブロン形状という。）されて
いるや又、磁性層５．６の外周には円筒状のコイルボビ
ン７が受動軸１と同軸状に配設される。コイルポビン７
の外周には第１及び第２の検出コイル８，９が巻装され
、各検出コイル８．９は図示しない検出回路に接続され
る。The first magnetic layer 5 is formed in a plurality of elongated strips (referred to as a chevron shape) in the direction of +45 degrees with respect to the central axis 2, and the second magnetic layer 6 is formed in a plurality of strips in the direction of -45 degrees with respect to the central axis 2. Furthermore, a cylindrical coil bobbin 7 is disposed coaxially with the passive shaft 1 on the outer periphery of the magnetic layer 5.6. coil pobbin 7
First and second detection coils 8, 9 are wound around the outer periphery of the sensor, and each detection coil 8.9 is connected to a detection circuit (not shown).
上記構成において、受動軸１に外部からトルクが印加さ
れると、各磁性層５，６の一方に引張力が発生するとと
もに他方に圧縮力が発生し、歪が生じる。この歪により
透磁率が変化し、引張力による場合と圧縮力による場合
では透磁率が逆方向に変化する。検出コイル８．９は透
磁率の変化を磁気的インピーダンスの変化として検出し
、検出回路は検出コイル８．９の出力を人力され、受動
軸１の歪量に応じた検出電圧を出力する。In the above configuration, when torque is applied to the passive shaft 1 from the outside, a tensile force is generated in one of the magnetic layers 5 and 6, and a compressive force is generated in the other, resulting in distortion. The magnetic permeability changes due to this strain, and the magnetic permeability changes in opposite directions depending on whether the tensile force is applied or the compressive force is applied. The detection coil 8.9 detects a change in magnetic permeability as a change in magnetic impedance, and the detection circuit receives the output of the detection coil 8.9 manually and outputs a detection voltage corresponding to the amount of strain on the passive shaft 1.
第３図（ａｌ〜ｆｄｌは従来の磁性層５．６の形成方法
を示し、まず（ａ）図に示すように例えばアモルファス
磁性材の薄帯１０の裏面に接着剤１１を塗布し、この薄
帯１０をｆｂ１図に示すように受動軸１の周囲にＳ回し
て接着する。次に、（Ｃ１図に示すようにオートクレー
ブ法または加圧法により薄帯１０を加圧する。オートク
レーブ法では（ｃ）図の上半部に示すように薄帯１０の
外周側をチューブ１２により覆い、チューブ１２内を排
気により減圧し、大気圧との差圧により薄帯１０を加圧
する。又、ｆＣ１図の下部に示す加圧法ではチューブ１
２の外側をさらにカバー１３で覆い、このカバー１３内
に給気して圧力を大気圧より高めて薄帯１０を加圧する
。FIG. 3 (al to fdl) shows a conventional method of forming a magnetic layer 5.6. First, as shown in FIG. As shown in Figure FB1, the strip 10 is turned S around the passive shaft 1 and bonded.Next, the ribbon 10 is pressurized by an autoclave method or a pressure method as shown in Figure C1.In the autoclave method, (c) As shown in the upper half of the figure, the outer circumferential side of the ribbon 10 is covered with a tube 12, the pressure inside the tube 12 is reduced by exhaust, and the ribbon 10 is pressurized by the pressure difference between atmospheric pressure and the lower part of the figure fC1. In the pressurization method shown in
The outside of the ribbon 2 is further covered with a cover 13, and air is supplied into the cover 13 to raise the pressure above atmospheric pressure, thereby pressurizing the ribbon 10.
この加圧状態で接着剤１１を加熱硬化させたのち、エツ
チングにより薄帯１０の選択除去処理を行い、Ｆｄ１図
に示すようなシェブロンパターンの磁性層５゜６を得る
。After the adhesive 11 is heated and cured in this pressurized state, the ribbon 10 is selectively removed by etching to obtain a magnetic layer 5.6 having a chevron pattern as shown in Figure Fd1.
しかしながら上記した従来の歪検出器では、薄帯１０の
加圧時においてチューブ１２により薄帯１０を加圧する
ため第３図ｆｃｌに示すように薄帯１０の軸方向両端部
に圧力集中点Ａが生じ、接着剤１１は軸方向中央部で厚
さが厚く軸方向両端部で厚さが薄くなり、又第４図ｆａ
１．（ｂｌに示すように接着剤１１の軸方向両端部では
圧力集中により径方向でも厚さが不均一になった。この
ため、残留熱応力などの相違により温度特性が悪化する
。又、接着剤１１の厚さにより受動軸１から磁性層５．
６への応力伝播比が変化するので、接着剤１１の厚みが
不均一、不安定であると出力特性にもバラツキが生じる
という問題点があった。However, in the conventional strain detector described above, since the ribbon 10 is pressurized by the tube 12 when the ribbon 10 is pressurized, pressure concentration points A are formed at both axial ends of the ribbon 10 as shown in FIG. As a result, the thickness of the adhesive 11 is thicker in the central part in the axial direction, and thinner in both ends in the axial direction, and as shown in FIG.
1. (As shown in bl, the thickness became uneven in the radial direction due to pressure concentration at both ends of the adhesive 11 in the axial direction. As a result, the temperature characteristics deteriorated due to differences in residual thermal stress, etc.) 11 from the passive shaft 1 to the magnetic layer 5.
Since the stress propagation ratio to the adhesive 11 changes, there is a problem in that if the thickness of the adhesive 11 is uneven or unstable, the output characteristics also vary.
この発明は上記のような問題点を解決するために成され
たものであり、接着剤の厚さを均一にし、温度特性及び
出力特性を向上することができる歪検出器を得ることを
目的とする。This invention was made to solve the above-mentioned problems, and its purpose is to obtain a strain detector that can make the thickness of the adhesive uniform and improve the temperature characteristics and output characteristics. do.
この発明に係る歪検出器は、受動軸に環状溝を設け、こ
の環状溝に磁性層をその外周面が受動軸の外周面と同一
面またはやや小径面となるように接着したものである。In the strain detector according to the present invention, an annular groove is provided in the passive shaft, and a magnetic layer is bonded to the annular groove such that the outer circumferential surface of the magnetic layer is flush with or has a slightly smaller diameter than the outer circumferential surface of the passive shaft.
この発明の磁性層は外周面が受動軸の外周面と同一面ま
たはやや小径面となっているので、加圧時に圧力集中点
が生じず、接着剤の厚さは均一となる。Since the outer circumferential surface of the magnetic layer of the present invention is flush with or has a slightly smaller diameter than the outer circumferential surface of the passive shaft, no pressure concentration points occur during pressurization, and the thickness of the adhesive becomes uniform.
以下、この発明の実施例を図面とともに説明する。第１
図はこの発明の第１の実施例を示し、受動軸ｌの外周部
に環状／１Ｉｔａを設け、この環状溝１ａにおいて接着
剤１１を介して薄帯ｌＯを接着する。この際、薄帯１０
の外周面が受動軸１の外周面と同一面またはやや小径面
となるように環状溝１ａの深さを予め定めである。接着
後は従来同様にオートクレーブ法あるいは加圧法により
薄帯１０を加圧し、この状態で接着剤１１を加熱硬化さ
せ、エツチング等により選択除去処理を行ってシェブロ
ン形状の磁性層５．６を形成する。Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows a first embodiment of the present invention, in which an annular /1Ita is provided on the outer periphery of a passive shaft l, and a thin ribbon lO is bonded through an adhesive 11 in this annular groove la. At this time, thin strip 10
The depth of the annular groove 1a is predetermined so that the outer circumferential surface of the annular groove 1a is flush with the outer circumferential surface of the driven shaft 1 or has a slightly smaller diameter. After adhesion, the ribbon 10 is pressed by an autoclave method or a pressure method in the same manner as in the past, and in this state the adhesive 11 is heated and hardened, and a selective removal process is performed by etching or the like to form a chevron-shaped magnetic layer 5.6. .
この実施例では、チューブ１２により薄帯１０を加圧す
る際に、薄帯１０の外周面が受動軸１の外周面より突出
していないので、圧力集中点が生じず、接着剤１１の厚
さは均一となる。In this embodiment, when the ribbon 10 is pressurized by the tube 12, the outer peripheral surface of the ribbon 10 does not protrude from the outer peripheral surface of the passive shaft 1, so no pressure concentration point occurs, and the thickness of the adhesive 11 is reduced. It becomes uniform.
第５図はこの発明の第２の実施例を示し、受動軸１の環
状溝１ａにおける磁性層５，６の接着部分の下部に最適
接着厚さｔに相当する深さを有する凹部１ｂを設け、こ
の凹部１ｂに接着剤１１を収容し、その上から薄帯１０
を接着する。以後は前述と同様であり、加圧状態におい
て接着剤１１を加熱硬化させ、エツチングにより薄帯１
０の不要部分１０ａを除去し、磁性層５．６を形成する
。FIG. 5 shows a second embodiment of the present invention, in which a recess 1b having a depth corresponding to the optimum bonding thickness t is provided below the bonded portion of the magnetic layers 5 and 6 in the annular groove 1a of the passive shaft 1. , the adhesive 11 is accommodated in the recess 1b, and the thin strip 10 is placed on top of the adhesive 11.
Glue. The subsequent steps are the same as described above, and the adhesive 11 is heated and cured under pressure, and the ribbon 1 is etched.
The unnecessary portion 10a of 0 is removed to form a magnetic layer 5.6.
この第２の実施例においては、接着剤１１の厚さは凹部
１ｂの深さｔに定められており、接着剤１１の厚さを確
実に最適にすることができる。又、この第２の実施例に
おいても薄帯１０の外周面は受動軸１の外周面と同一面
かあるいはやや小径面となっており、加圧時に圧力集中
点は生じず、接着剤１１の厚さにむらは生じない。In this second embodiment, the thickness of the adhesive 11 is determined by the depth t of the recess 1b, so that the thickness of the adhesive 11 can be reliably optimized. Also in this second embodiment, the outer circumferential surface of the ribbon 10 is the same as the outer circumferential surface of the driven shaft 1 or has a slightly smaller diameter, so that no pressure concentration point occurs during pressurization, and the adhesive 11 There is no unevenness in thickness.
以上のようにこの発明によれば、受動軸に環状溝を設け
、この環状溝に磁性層をその外周面が受動軸の外周面と
同一面または小径面となるように接着しており、この磁
性層の加圧時に圧力集中点が生じず、接着剤の厚さが均
一となる。このため、残留熱応力などの温度特性が改善
され、また受動軸から磁性層への応力伝播比も均一とな
り、出力特性も改善される。As described above, according to the present invention, the annular groove is provided in the passive shaft, and the magnetic layer is bonded to the annular groove so that the outer circumferential surface of the magnetic layer is flush with or has a smaller diameter than the outer circumferential surface of the passive shaft. No pressure concentration points occur when pressing the magnetic layer, and the thickness of the adhesive becomes uniform. Therefore, temperature characteristics such as residual thermal stress are improved, the stress propagation ratio from the passive shaft to the magnetic layer is also made uniform, and output characteristics are also improved.
第１図はこの発明の第１実施例における歪検出器の加圧
時の要部断面図、第２図は従来の歪検出器の断面図、第
３図（ａ）〜ｆｄｌは従来の歪検出器の磁性層の製造方
法の説明図、第４図ｆａ１．（′ｂｌは従来の歪検出器
の要部断面図及び要部側面図、第５図（ａ）。
（ｂｌはこの発明の第２の実施例における歪検出器の加
圧時の要部断面図及び要部正面図である。
■・・・受動軸、１ａ・・・環状溝、１ｂ・・・凹部、
５゜６・・・磁性層、８．９・・・検出コイル、１０・
・・磁性材薄帯、１１・・・接着剤、１２・・・チュー
ブ。
尚、図中同一符号は同−又は相当部分を示す。
代理人 大 岩 増 雄
第１因
第２図FIG. 1 is a cross-sectional view of the main part of the strain detector according to the first embodiment of the present invention when pressurized, FIG. 2 is a cross-sectional view of a conventional strain detector, and FIGS. Explanatory diagram of the method for manufacturing the magnetic layer of the detector, FIG. 4 fa1. ('bl is a cross-sectional view of the main part and a side view of the main part of the conventional strain detector, FIG. 5(a). Fig. 2 is a diagram and a front view of main parts. ■... Passive shaft, 1a... Annular groove, 1b... Recessed part,
5゜6...Magnetic layer, 8.9...Detection coil, 10.
...Magnetic material ribbon, 11...Adhesive, 12...Tube. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa Cause 1 Diagram 2
Claims (2)
受動軸と、受動軸の環状溝に外周面が受動軸の外周面と
同一面またはやや小径面となるように接着剤を介して接
着された高透歪特性を有する磁性層と、磁性層の周囲に
配設され、磁性層の上記応力に応じた歪による透磁率変
化を検出する検出コイルを備えたことを特徴とする歪検
出器。(1) A passive shaft that is subjected to stress and has an annular groove formed around it, and is bonded to the annular groove of the passive shaft using an adhesive so that the outer circumferential surface is flush with the outer circumferential surface of the passive shaft or has a slightly smaller diameter surface. A strain detector comprising: a magnetic layer having a high permeability strain characteristic; and a detection coil disposed around the magnetic layer to detect changes in permeability due to strain in the magnetic layer in response to the stress. .
ことを特徴とする特許請求の範囲第１項記載の歪検出器
。(2) The strain detector according to claim 1, wherein a recess for accommodating an adhesive is provided in the annular groove of the passive shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27455587A JPH01114729A (en) | 1987-10-28 | 1987-10-28 | Distortion detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27455587A JPH01114729A (en) | 1987-10-28 | 1987-10-28 | Distortion detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01114729A true JPH01114729A (en) | 1989-05-08 |
Family
ID=17543357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27455587A Pending JPH01114729A (en) | 1987-10-28 | 1987-10-28 | Distortion detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01114729A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024641A (en) * | 2005-07-14 | 2007-02-01 | Honda Motor Co Ltd | Magnetostrictive torque sensor and formation method of magnetostrictive film thereof |
| JP2007255916A (en) * | 2006-03-20 | 2007-10-04 | Honda Motor Co Ltd | Magnetostrictive torque sensor, and electric power steering device |
-
1987
- 1987-10-28 JP JP27455587A patent/JPH01114729A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024641A (en) * | 2005-07-14 | 2007-02-01 | Honda Motor Co Ltd | Magnetostrictive torque sensor and formation method of magnetostrictive film thereof |
| JP2007255916A (en) * | 2006-03-20 | 2007-10-04 | Honda Motor Co Ltd | Magnetostrictive torque sensor, and electric power steering device |
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