JPS59208431A - Torque detecting device - Google Patents
Torque detecting deviceInfo
- Publication number
- JPS59208431A JPS59208431A JP8376183A JP8376183A JPS59208431A JP S59208431 A JPS59208431 A JP S59208431A JP 8376183 A JP8376183 A JP 8376183A JP 8376183 A JP8376183 A JP 8376183A JP S59208431 A JPS59208431 A JP S59208431A
- Authority
- JP
- Japan
- Prior art keywords
- torque
- tubular body
- shaft
- measured
- shafts
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
- G01L3/102—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving magnetostrictive means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は、磁歪効宋を利用したトルク検出装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a torque detection device using a magnetostrictive effect.
(従来技術とその問題点)
従来のトルク検出装置としては、例えば特公昭51−1
4985号公報に示される十字交差型コアを有するもの
等のように種々の構造のものが従来より知られている。(Prior art and its problems) As a conventional torque detection device, for example, the
Various structures have been known in the past, such as one having a criss-cross core as shown in Japanese Patent No. 4985.
第1図および第2図は、十字交差型コアを有する磁歪式
トルク検出装置の検出部の構成を示す図であり、第1図
はその正面図、第2図は第1図の■−■轢断面図である
。1 and 2 are diagrams showing the configuration of a detection section of a magnetostrictive torque detection device having a criss-cross core, with FIG. 1 being a front view thereof, and FIG. It is a cross-sectional view.
この1〜ルク検出装置は、!1竹体で形成された被測定
軸1の外側に、軸方向へ向けてこれと平行にコの字状の
励磁用コア2を配置するとともに、その両脚部2a、2
bには、互いに直列接続された励磁用コイル3a 、3
bを配置し、更にこの励磁用コア2と直交させて同様に
コの字状の検出用コア4を配置するとともに、その両脚
部4a、4bには互いに直列接続された検出用コイル5
a、5わを巻回させ、これにより励磁用コイル3a、3
bの起磁力によって被測定軸1を軸方向へ交番磁化する
とともに、被測定軸1に対する印加トルクに応じて被測
定軸に生ずる磁束磁歪成分を検出用コイル5a、5bと
鎖交させ、印加1−ルクに応じた誘導起電力を検出用コ
イル5a、5bに誘起させるようにしたものである。This 1~lux detection device is! 1. A U-shaped excitation core 2 is placed on the outside of the measured shaft 1 formed of a bamboo body and parallel to the axis, and its legs 2a, 2
b, excitation coils 3a, 3 connected in series with each other;
Further, a U-shaped detection core 4 is similarly arranged perpendicular to the excitation core 2, and detection coils 5 connected in series are disposed on both legs 4a and 4b of the U-shaped detection core 4.
a, 5 wires, thereby exciting coils 3a, 3
The measured shaft 1 is alternately magnetized in the axial direction by the magnetomotive force of b, and the magnetic flux magnetostrictive component generated on the measured shaft according to the torque applied to the measured shaft 1 is linked with the detection coils 5a and 5b, and the applied 1 - An induced electromotive force corresponding to the torque is induced in the detection coils 5a and 5b.
しかしながら、上記従来のトルク検出装置にあっては、
被測定軸を1本の丸棒で形成しているため、例えば自動
車のエンジントルク等比較的大きなトルクを検出する場
合には径の太い被測定軸を用いることによって、精度お
よび強度の面で適用可能であったが、自動車のステアリ
ングハンドルの操舵トルク等のように、IKam以下の
比較的小さなトルクを検出する場合には、径の太い被測
定軸では検出精度が低下する。However, in the above conventional torque detection device,
Since the shaft to be measured is made of a single round bar, for example, when detecting a relatively large torque such as the engine torque of a car, a shaft to be measured with a large diameter can be used to improve accuracy and strength. However, when detecting a relatively small torque equal to or less than IKam, such as the steering torque of a steering wheel of an automobile, detection accuracy decreases with a shaft to be measured having a large diameter.
また、小さなトルクを検出するために被測定軸の径を細
くすると、検出精度は向上するが、強度が低下するため
、上記の如くハンドルの操舵トルクを検出する場合等に
は、車両が縁石に乗り上げた場合等瞬間的に大きなトル
ク(20Kam以上)が加わり、被測定軸が塑性変形し
たり、表面に磁気歪みが残る等不都合が生じることとな
る。Furthermore, if the diameter of the shaft to be measured is reduced in order to detect small torques, the detection accuracy will improve, but the strength will decrease, so when detecting the steering torque of the steering wheel as described above, etc. When a vehicle runs over a vehicle, a large torque (20 km or more) is instantaneously applied, causing problems such as plastic deformation of the shaft to be measured and magnetic distortion remaining on the surface.
(発明の目的)
この発明は上記の事情に鑑みてなされたもので、その目
的どするところは、小さな1ヘルクをも精度良く検出す
ることが可能で、かつ大きなトルクが加わった場合に、
これに対重る強度を備え、しかも量産性の高いトルク検
出装置を提供することにある。(Objective of the Invention) This invention was made in view of the above circumstances, and its purpose is to be able to accurately detect even a small 1 herk, and to detect when a large torque is applied.
It is an object of the present invention to provide a torque detection device that has strength comparable to that and is highly mass-producible.
(発明の構成)
上記目的を達成づ−るために本5e明は、被測定軸を所
定間隙の遊びを有して噛合する継手構造によって連接し
てなる2本の軸から構成し、前記被測定された磁性体か
らなる管状体を設けたことを特徴とするものである。(Structure of the Invention) In order to achieve the above-mentioned object, the present invention 5e comprises two shafts connected by a joint structure that meshes the shaft to be measured with a play of a predetermined gap, and The device is characterized in that a tubular body made of the measured magnetic material is provided.
(実施例の説明)
以下、本発明の一実施例を第3図以下の図面を用いて詳
細に説明する。(Description of an Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 3 and subsequent drawings.
第3図は、本発明に係る1〜ルク検出装置の一実施例の
構造を示す図である。なお、同図において、被測定軸を
励磁lする励磁用コイルおJ:び、被測定軸に生ずる磁
束磁歪成分を検出する検出用コイルは、第1図に示した
従来例と同一構成であるため、図示および説明は省略す
る。FIG. 3 is a diagram showing the structure of an embodiment of the 1-lux detection device according to the present invention. In the same figure, the excitation coil J that excites the shaft to be measured and the detection coil that detects the magnetostrictive component of the magnetic flux generated in the shaft to be measured have the same configuration as the conventional example shown in FIG. Therefore, illustration and description will be omitted.
同図に示す如く、この実施例のトルク検出装置は、被測
定軸10が2本の円筒状の軸11(第1軸)、12(第
2軸)を連接してなるもので、その連接部には、軸方向
に突出する噛合爪13.14が複数設けられており、互
いの噛合爪13.14を噛み合わせることによって連接
がなされている。As shown in the figure, in the torque detection device of this embodiment, the shaft to be measured 10 is formed by connecting two cylindrical shafts 11 (first shaft) and 12 (second shaft). A plurality of interlocking pawls 13.14 are provided in the section and protrude in the axial direction, and the interlocking pawls 13.14 are connected to each other by interlocking with each other.
また、上記噛合爪13と噛合爪14との間には、所定間
隙dの遊びを設けである。Furthermore, a play of a predetermined gap d is provided between the engaging pawl 13 and the engaging pawl 14.
そして、上記被測定軸10の連接部には、その外周を覆
うとともに、両端がそれぞれ2つの軸11.12の外周
に溶接固定された、磁性体からなる管状体15が嵌合さ
れている。A tubular body 15 made of a magnetic material is fitted into the connecting portion of the shaft 10 to be measured, covering the outer circumference thereof and having both ends welded and fixed to the outer circumferences of the two shafts 11 and 12, respectively.
更に、上記被測定軸10の内部には、第4図縦断面図お
よび第5図横断面図に示す如く、上記被測定軸10の連
接部において小径部16aが形成されたトーションバー
16が挿通されている。この]−−ジョンバー16は、
その外周に軸方向に沿ってスプラインが形成されており
、上記2つの軸5−
11.12の内面にこれに対応して形成されたスプライ
ンに挿入嵌合されて係合がなされている。Further, a torsion bar 16 having a small diameter portion 16a formed at the connecting portion of the shaft to be measured 10 is inserted into the inside of the shaft to be measured 10, as shown in the vertical cross-sectional view in FIG. 4 and the horizontal cross-sectional view in FIG. has been done. This]--version 16 is
A spline is formed along the axial direction on the outer periphery of the shaft 5-11.12, and the shaft 5-11.12 is inserted into and engaged with the spline formed correspondingly on the inner surface of the shaft 5-11.12.
なお、このトーションバー16と2つの軸11゜12ど
の係合部には、接着剤を塗布あるいは充!眞することに
より強固な結合を行なうことができる。It should be noted that adhesive is applied or filled to the engaging portions of this torsion bar 16 and the two shafts 11 and 12! A strong bond can be achieved by tightening.
また、上記2つの軸11.12およびトーションバー1
6の祠質は磁性体または非磁性体のどちらでも良い。In addition, the above two shafts 11 and 12 and the torsion bar 1
The abrasive material No. 6 may be either magnetic or non-magnetic.
」−記の如く構成されたトルク検出装置において、被測
定軸10にトルクが印加された場合、この印加されたト
ルクが比較的小さい場合には、上記2つの軸11.12
の噛合爪13.14は遊びを有している状態のため、捩
りモーメントは上記管状体15およびトーションバー1
6の小径部16aに働くこととなる。この場合、十配管
状体15およびトーションバー16の小径部16aはど
もに、捩り強度が低いため、微小なトルク変動に対して
も大きく捩れ量が変動し、これによって管状体15に生
じる11歪吊は大きく変vJすることとなる。” - In the torque detection device configured as described above, when torque is applied to the shaft 10 to be measured, if this applied torque is relatively small, the two shafts 11 and 12
Since the engaging pawls 13 and 14 have play, the torsional moment is generated between the tubular body 15 and the torsion bar 1.
This will work on the small diameter portion 16a of No.6. In this case, since both the tubular body 15 and the small diameter portion 16a of the torsion bar 16 have low torsional strength, the amount of torsion varies greatly even with minute torque fluctuations, and this causes strain in the tubular body 15. The suspension will change significantly.
他方、被測定軸10に比較的大きなトルクが印6一
加された場合には、上記噛合爪13と噛合爪14とが当
接し、捩りモーメントは、上記管状体15と1ヘーシヨ
ンバー16の小径部16aに加えて軸11.12にも働
くこととなる。これによって、捩りモーメントに対する
強度は急激に大となって、トルクの変動量に対する管状
体15の捩れ量の変動率は小さくなり、磁歪の変動率も
小さくなる。On the other hand, when a relatively large torque is applied to the shaft 10 to be measured, the engaging pawls 13 and 14 come into contact with each other, and the torsional moment is generated between the tubular body 15 and the small diameter portion of the hexion bar 16. In addition to 16a, it will also act on axis 11.12. As a result, the strength against torsional moment increases rapidly, the rate of variation in the amount of twist of the tubular body 15 with respect to the amount of variation in torque decreases, and the rate of variation in magnetostriction also decreases.
上記噛合爪13と噛合爪14が当接するときのトルクを
基準トルクTとすれば、第6図に示す如く、前記基準ト
ルクT以下の小さなトルクが印加された場合には、11
歪成分の検出出力の変化率は大きく、精度の良い検出が
行なえる。If the torque when the engaging claws 13 and 14 come into contact is the reference torque T, then as shown in FIG. 6, when a small torque less than the reference torque T is applied, 11
The rate of change in the detection output of the distortion component is large, allowing highly accurate detection.
また、前記基準トル91以上の大ぎなトルクが印加され
た場合には、磁歪成分の検出出力の変化率は小さくなる
が、上記2つの軸11.12が接合することによって捩
りモーメントに対する強度が増大し、上記管状体15が
塑性変形したり、表面に磁気歪みが残る等の不都合を生
ずることがない。Further, when a large torque equal to or greater than the reference torque 91 is applied, the rate of change in the detected output of the magnetostrictive component becomes small, but the strength against torsional moments increases due to the connection of the two shafts 11 and 12. However, problems such as plastic deformation of the tubular body 15 and magnetic distortion remaining on the surface do not occur.
また、前記噛合爪13.14は、それぞれ径の太い2つ
の軸12.11に形成されているため、精密加工を要す
る所定間隙dの精度は高く、量産性に優れている。Further, since the engaging pawls 13, 14 are formed on two shafts 12, 11 each having a large diameter, the predetermined gap d, which requires precision machining, has high accuracy and is excellent in mass production.
また、従来のトルク検出装置には、被測定軸の外周一部
に高磁性材料の被膜をメッキによって形成したものがあ
るが、このようなメッキ層は長時間繰り返し1−ルクを
印加した場合に剥離する虞れがあり、耐久性が低いもの
であったが、J−記実施例の如く磁性体の管状体15を
被測定軸10外因に■合固定する構造によって耐久性お
よび生産性を向上させることができる。In addition, some conventional torque detection devices have a coating of highly magnetic material formed on a part of the outer periphery of the shaft to be measured by plating. Although there was a risk of peeling and the durability was low, the durability and productivity were improved by the structure in which the magnetic tubular body 15 was fitted and fixed to the outside of the shaft 10 to be measured as in the example described in J. can be done.
なお、前記実施例においては、励磁用コアおJ:び検出
用コアの構成として十字交差型=17の場合を示したが
、各コアの形状はこれに限定されるものではなく、例え
ば特公昭35−12=147号公報に示されるような環
状コアにも適用することができることは勿論である。In the above embodiment, the configuration of the excitation core and the detection core is criss-cross type = 17, but the shape of each core is not limited to this. Of course, the present invention can also be applied to an annular core as shown in Japanese Patent No. 35-12=147.
(発明の効宋)
以−L詳細に説明したように、本発明のトルク検出装置
にあっては、微弱なトルク変動をも精度良く検出するこ
とができ、かつ大きなトルクが印加された場合に故障が
生ずることがなく、感度および強度の両者において性能
を向上させることができ、しかも」産性が極めて向上す
る。(Effects of the Invention) As explained in detail, the torque detection device of the present invention can detect even weak torque fluctuations with high accuracy, and when a large torque is applied. Failures do not occur, performance can be improved in both sensitivity and strength, and productivity is greatly improved.
第1図は従来のトルク検出装置の一例を示す図、第2図
は第1図における■−■線断面図、第3図は本発明に係
るトルク検出装置の一実施例の構成を一部切欠いて示す
斜視図、第4図は同装置の縦断面図、第5図は同装置の
横断面図、第6図は同装置におけるトルクと磁歪成分検
出出力との関係を示すグラフである。
2・・・・・・・・・・・・・・・・・・励磁用コア4
・・・・・・・・・・・・・・・・・・検出用コア10
・・・・・・・・・・・・・・・被測定軸11・・・・
・・・・・・・・・・・第1軸12・・・・・・・・・
・・・・・・第2軸13.14・・・・・・噛合爪
15・・・・・・・・・・・・・・・管状体d・・・・
・・・・・・・・・・・・・・遊び9−
第1図
第2図FIG. 1 is a diagram showing an example of a conventional torque detection device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 4 is a longitudinal sectional view of the same device, FIG. 5 is a cross-sectional view of the same device, and FIG. 6 is a graph showing the relationship between torque and magnetostrictive component detection output in the same device. 2・・・・・・・・・・・・・・・Excitation core 4
・・・・・・・・・・・・・・・Detection core 10
・・・・・・・・・・・・Measurement axis 11...
・・・・・・・・・・・・First axis 12・・・・・・・・・
...Second shaft 13.14...Matching pawl 15...Tubular body d...
・・・・・・・・・・・・・・・Play 9- Figure 1 Figure 2
Claims (1)
構造によって連接してなる被測定軸と:前記被測定軸の
連接部外周を覆うとともに、両軸に接合固定された磁性
体からなる管状体と:前記管状体の外側に配置され、か
つこの管状体を一定の方向へ交番磁化するための励磁用
コイルと; 前記管状体を流れる磁束の中で、印加トルクに応じた磁
歪成分を出力するための検出コイルとを具備することを
特徴とするトルク検出装置。(1) A shaft to be measured, which is formed by connecting two shafts by a joint structure that meshes with a predetermined play of a predetermined gap: A magnetic shaft that covers the outer periphery of the connecting portion of the shaft to be measured and is bonded and fixed to both shafts. a tubular body consisting of: an excitation coil disposed outside the tubular body and for alternately magnetizing the tubular body in a certain direction; A torque detection device comprising: a detection coil for outputting a magnetostrictive component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8376183A JPS59208431A (en) | 1983-05-13 | 1983-05-13 | Torque detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8376183A JPS59208431A (en) | 1983-05-13 | 1983-05-13 | Torque detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59208431A true JPS59208431A (en) | 1984-11-26 |
Family
ID=13811552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8376183A Pending JPS59208431A (en) | 1983-05-13 | 1983-05-13 | Torque detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59208431A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0285259A2 (en) * | 1987-02-27 | 1988-10-05 | Honda Giken Kogyo Kabushiki Kaisha | Magnetostrictive torque sensor |
DE102006054179A1 (en) * | 2006-11-16 | 2008-05-21 | Robert Bosch Gmbh | Torque moment i.e. steering moment, measuring device, has shaft divided into input and output shafts, which are connected by torsion unit with reduced rigidity, which carries magnetic coding, where torsion unit is coupled with clutch |
WO2015104766A1 (en) * | 2014-01-09 | 2015-07-16 | 日本精工株式会社 | Torque sensor and electric power-steering device |
EP2505980A3 (en) * | 2011-03-19 | 2016-11-30 | Volkswagen Aktiengesellschaft | Method and device for determining a torque |
-
1983
- 1983-05-13 JP JP8376183A patent/JPS59208431A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0285259A2 (en) * | 1987-02-27 | 1988-10-05 | Honda Giken Kogyo Kabushiki Kaisha | Magnetostrictive torque sensor |
DE102006054179A1 (en) * | 2006-11-16 | 2008-05-21 | Robert Bosch Gmbh | Torque moment i.e. steering moment, measuring device, has shaft divided into input and output shafts, which are connected by torsion unit with reduced rigidity, which carries magnetic coding, where torsion unit is coupled with clutch |
EP2505980A3 (en) * | 2011-03-19 | 2016-11-30 | Volkswagen Aktiengesellschaft | Method and device for determining a torque |
WO2015104766A1 (en) * | 2014-01-09 | 2015-07-16 | 日本精工株式会社 | Torque sensor and electric power-steering device |
CN105247330A (en) * | 2014-01-09 | 2016-01-13 | 日本精工株式会社 | Torque sensor and electric power-steering device |
JP5958664B2 (en) * | 2014-01-09 | 2016-08-02 | 日本精工株式会社 | Torque sensor and electric power steering device |
EP2988106A4 (en) * | 2014-01-09 | 2016-11-16 | Nsk Ltd | Torque sensor and electric power-steering device |
US9557234B2 (en) | 2014-01-09 | 2017-01-31 | Nsk Ltd. | Torque sensor and electric power steering device |
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