JPH01318933A - Torque sensor - Google Patents
Torque sensorInfo
- Publication number
- JPH01318933A JPH01318933A JP15081088A JP15081088A JPH01318933A JP H01318933 A JPH01318933 A JP H01318933A JP 15081088 A JP15081088 A JP 15081088A JP 15081088 A JP15081088 A JP 15081088A JP H01318933 A JPH01318933 A JP H01318933A
- Authority
- JP
- Japan
- Prior art keywords
- cylinders
- magnetic coupling
- cylinder
- torque
- amorphous alloy
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 45
- 238000010168 coupling process Methods 0.000 claims abstract description 45
- 238000005859 coupling reaction Methods 0.000 claims abstract description 45
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 abstract description 29
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 230000004323 axial length Effects 0.000 description 11
- 239000000696 magnetic material Substances 0.000 description 8
- 230000004907 flux Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910020641 Co Zr Inorganic materials 0.000 description 1
- 229910020517 Co—Ti Inorganic materials 0.000 description 1
- 229910020520 Co—Zr Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
Landscapes
- Power Steering Mechanism (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はトルクセンサに関し、特に自動車の電動パワー
ステアリング装置に適用するのに好適なトルクセンサを
提供するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a torque sensor, and particularly provides a torque sensor suitable for application to an electric power steering device of an automobile.
自動車の操舵輪を操作する力を補助するパワーステアリ
ング装置として電動式のものが開発されつつある。これ
は操舵輪に加えられた回転トルクを検出し、そのトルク
に応じて、操舵機構に設けた電動機を回転させる構造と
なっている。2. Description of the Related Art Electric power steering devices are being developed that assist the power to operate the steering wheels of automobiles. This has a structure that detects rotational torque applied to the steering wheels and rotates an electric motor provided in the steering mechanism according to the detected torque.
ところで、このトルク検出手段としては例えば第３図に
示す構造のトルクセンサを本願出願人が開発している（
特願昭６２−２９９５９５号）。第３図はそのトルクセ
ンサの半裁部分断面図である。図示しない操舵輪を取付
けている上部軸１ａはトーションバー１ｂを介して、図
示しない操舵機構を取付けている下部軸１ｃと同心的に
連結されている。上部軸１ａには非磁性体の第１スリー
ブ２を外嵌固着し、その第１スリーブ２には軸方向に適
長離隔して磁性体の円筒３，４を外嵌固着している。円
筒３の夫々の軸端面は上部軸１ａの軸心に垂直な平面と
なっている。By the way, as this torque detection means, for example, the applicant has developed a torque sensor having the structure shown in FIG.
(Japanese Patent Application No. 62-299595). FIG. 3 is a partial cross-sectional view of the torque sensor. An upper shaft 1a to which a steering wheel (not shown) is attached is concentrically connected via a torsion bar 1b to a lower shaft 1c to which a steering mechanism (not shown) is attached. A first sleeve 2 made of a non-magnetic material is fitted and fixed onto the upper shaft 1a, and cylinders 3 and 4 made of magnetic material are fitted and fixed onto the first sleeve 2 at an appropriate distance apart in the axial direction. Each shaft end surface of the cylinder 3 is a plane perpendicular to the axis of the upper shaft 1a.
前記円筒４の円筒３と対向する軸端面は上部軸１ａの軸
心に垂直な平面となっており、反対側の軸端面は上部軸
１ａの軸心に所定傾斜角を有して非垂直、また軸心に関
し非対称な平面となっている。The shaft end surface of the cylinder 4 facing the cylinder 3 is a plane perpendicular to the axial center of the upper shaft 1a, and the shaft end surface on the opposite side has a predetermined inclination angle to the axial center of the upper shaft 1a and is non-perpendicular. Furthermore, the plane is asymmetrical with respect to the axis.
即ち、円筒４はその径方向に対称な位置のｍ個Ａから他
側（図示せず）までの−半周側Ｒ１及び他側からｍ個Ａ
までの他生周側Ｒ２の軸長が最長寸法から最短寸法まで
順次短くなっており、２つの歯部を有するラチェツト歯
車状となっている。That is, the cylinder 4 has m pieces A at radially symmetrical positions to the other side (not shown) - half circumference side R1 and m pieces A from the other side.
The axial length of the outer circumferential side R2 becomes gradually shorter from the longest dimension to the shortest dimension, and has a ratchet gear shape with two teeth.
下部軸１ｃには非磁性体の第２スリーブ５を外嵌固着し
、その第２スリーブ５には磁性体の円筒６を外嵌固着し
ている。この円筒６は前記円筒４と同寸、同形状であり
、傾斜している軸端面を、円筒４の傾斜している軸端面
側にして適長離隔して対向した状態に位置決めしている
。A second sleeve 5 of non-magnetic material is externally fitted and fixed to the lower shaft 1c, and a cylinder 6 of magnetic material is externally fitted and fixed to the second sleeve 5. This cylinder 6 has the same size and shape as the cylinder 4, and is positioned so that the inclined shaft end face is on the side of the inclined shaft end face of the cylinder 4, facing each other at an appropriate distance apart.
円筒３，４の軸端面及び円筒４，６の軸端面が夫々対向
している位置の側方には、内フランジを有する磁性体の
筒体７，８を、円筒３．４、円筒４．６から適長離隔さ
せてそれらに跨がらせて配設している。筒体７，８の各
内周溝には温度補償コイル９、磁気結合検出コイル１０
を夫々巻回している。これらのコイル９．１０の出力電
圧を差動増幅器１１に与えている。On the sides of the positions where the axial end surfaces of the cylinders 3 and 4 and the axial end surfaces of the cylinders 4 and 6 face each other, magnetic cylinders 7 and 8 having inner flanges are placed on the sides of the cylinders 3.4, 4. It is placed an appropriate length away from 6 and straddles them. A temperature compensation coil 9 and a magnetic coupling detection coil 10 are provided in each inner circumferential groove of the cylinders 7 and 8.
are wound around each. The output voltages of these coils 9 and 10 are applied to a differential amplifier 11.
このトルクセンサは、温度補償コイル９及び磁気結合検
出コイル１０に発振器を接続すると、それらのコイル９
，１０が円筒３，４と、また円筒４゜６と夫々電磁結合
する。ここで上部軸１ａを一側／又は他側方向に回転さ
せるとトーションバー１ｂが捩じれて円筒４と円筒６と
が相対回転する。そのため円筒４の軸端面と円筒６の軸
端面との対向間隙が減少／又は増加して円筒４と円筒６
との磁気結合状態が変わる。そのため磁気結合検出コイ
ル１０には、その磁気結合状態に相応する正／又は負の
電圧が誘起される。一方、円筒３．４の対向間隙は一定
であるから、温度補償コイル９に誘起する電圧は一定と
なる。したがって、磁気結合検出コイルｌＯの電圧と温
度補償コイル９の電圧との差を得ることにより、温度変
化による両コイル１０゜９の電圧変化分が打ち消されて
円筒４と６との相対回転量に相応した磁気結合状態の電
圧が得られる。In this torque sensor, when an oscillator is connected to the temperature compensation coil 9 and the magnetic coupling detection coil 10, those coils 9
, 10 are electromagnetically coupled to the cylinders 3 and 4 and to the cylinder 4°6, respectively. When the upper shaft 1a is rotated in one direction or the other direction, the torsion bar 1b is twisted and the cylinders 4 and 6 rotate relative to each other. Therefore, the opposing gap between the axial end surface of the cylinder 4 and the axial end surface of the cylinder 6 decreases/increases, causing the cylinder 4 and the cylinder 6 to
The state of magnetic coupling with the material changes. Therefore, a positive/negative voltage corresponding to the magnetic coupling state is induced in the magnetic coupling detection coil 10. On the other hand, since the opposing gap between the cylinders 3.4 is constant, the voltage induced in the temperature compensation coil 9 is constant. Therefore, by obtaining the difference between the voltage of the magnetic coupling detection coil lO and the voltage of the temperature compensation coil 9, the voltage change of both coils 10°9 due to temperature change is canceled out, and the amount of relative rotation between the cylinders 4 and 6 is changed. A voltage with a corresponding magnetic coupling state is obtained.
これらの円筒４と円筒６との相対回転量は、上部軸１ａ
に加えた回転トルクによって定まるから、磁気結合検出
コイル１０に誘起した電圧よりトーションバー１ｂに作
用したトルクを検出している。The amount of relative rotation between these cylinders 4 and 6 is based on the upper axis 1a.
The torque acting on the torsion bar 1b is detected from the voltage induced in the magnetic coupling detection coil 10.
前述したトルクセンサは、トーションバー１ｂが。 The torque sensor described above includes the torsion bar 1b.
捩じれた場合に相対回転する円筒４，６に、一般鋼材又
は磁性鋼材を用いている。そのため、円筒４．６に高磁
束密度が得られず、円筒４．６の磁気結合に相応して磁
気結合検出コイルに誘起される出力電圧が低い。そのた
め、出力電圧を増幅すべき増幅器を必要とし、また外部
の電磁波の如きノイズ又は外部磁界の影響をうける虞れ
があるという問題がある。The cylinders 4 and 6, which rotate relative to each other when twisted, are made of general steel or magnetic steel. Therefore, a high magnetic flux density cannot be obtained in the cylinder 4.6, and the output voltage induced in the magnetic coupling detection coil is low corresponding to the magnetic coupling of the cylinder 4.6. Therefore, there is a problem in that an amplifier is required to amplify the output voltage, and there is also a risk of being influenced by noise such as external electromagnetic waves or external magnetic fields.
本発明は前述した問題に鑑み、磁気結合検出コイルから
高い出力電圧が得られて、トルクを高精度に検出するト
ルクセンサを提供することを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a torque sensor that can obtain a high output voltage from a magnetically coupled detection coil and detect torque with high precision.
本発明に係るトルクセンサは、トーションバーを介して
連結された２つの軸の夫々と連動し、該２つの軸の相対
回転により磁気結合状態が変化する２つの円筒を備え、
該２つの円筒の磁気結合状態を検出してトルクを検出す
るトルクセンサであって、前記２つの円筒を非晶質合金
により構成してあることを特徴とする。The torque sensor according to the present invention includes two cylinders that operate in conjunction with two shafts connected via a torsion bar, and whose magnetic coupling state changes with relative rotation of the two shafts,
The torque sensor detects torque by detecting the magnetic coupling state of the two cylinders, and is characterized in that the two cylinders are made of an amorphous alloy.
トーションバーと連結されている一方の軸に回転トルク
を加えると、そのトルクに応じてトーションバーが捩じ
れる。一方の軸受に外嵌固着された非晶質合金製の一方
の円筒が回転する。他方の軸受に外嵌固着された非晶質
合金製の他方の円筒の軸端部と、一方の円筒の軸端部と
の対向間隙が変わる。２つの円筒の磁気結合状態を検出
して、トーションバーに作用したトルクを検出する。When rotational torque is applied to one of the shafts connected to the torsion bar, the torsion bar is twisted in response to the torque. One cylinder made of an amorphous alloy externally fitted and fixed to one of the bearings rotates. The opposing gap between the shaft end of the other cylinder made of amorphous alloy externally fitted and fixed to the other bearing and the shaft end of one cylinder changes. The magnetic coupling state of the two cylinders is detected to detect the torque acting on the torsion bar.
よって、両回筒の磁気結合により磁気結合検出コイルに
は高い電圧が誘起される。Therefore, a high voltage is induced in the magnetic coupling detection coil due to the magnetic coupling between the two cylinders.
以下本発明をその実施例を示す図面によって詳述する。 The present invention will be described in detail below with reference to drawings showing embodiments thereof.
第１図は本発明に係るトルクセンサの構造を示す半裁断
面図、第２図はその内側部材の斜視図である。入力軸２
０は図示しない操舵輪が取付けられている上部軸２１ａ
と操舵機構の図示しないピニオンが取付けられている下
部軸２１ｃとがトーションバー２１ｂを介して同軸的に
連結されてなるものであり、上部軸２１ａは車体に固定
されている筒状のケース２２に軸受２３を介して回転自
在に支持されている。FIG. 1 is a half-cut sectional view showing the structure of a torque sensor according to the present invention, and FIG. 2 is a perspective view of its inner member. Input shaft 2
0 is an upper shaft 21a to which a steering wheel (not shown) is attached.
and a lower shaft 21c to which a pinion (not shown) of the steering mechanism is attached are coaxially connected via a torsion bar 21b, and the upper shaft 21a is connected to a cylindrical case 22 fixed to the vehicle body. It is rotatably supported via a bearing 23.
上部軸２１ａの下端部（図面左側）の外径は、下部軸２
１ｃの上端部（図面右側）の孔への挿入のために小径と
してあり、上部軸２１ａの大径部の下端部には非磁性体
からなる第１スリーブ２４ａを外嵌固着し、その外周に
例えば非晶質合金の成形体からなる第１．第２の円筒２
５．２６を軸方向に若干離隔して入力軸２０と同心的に
外嵌固着しである。The outer diameter of the lower end (left side in the drawing) of the upper shaft 21a is
A first sleeve 24a made of a non-magnetic material is fitted and fixed to the lower end of the large diameter part of the upper shaft 21a, and a first sleeve 24a made of a non-magnetic material is fixed to the outer circumference of the upper shaft 21a. For example, the first part is made of a molded body of an amorphous alloy. second cylinder 2
5.26 is externally fitted and fixed concentrically with the input shaft 20 with a slight distance in the axial direction.
上側の第１の円筒２５は上、下端縁が入力軸２０の軸心
に垂直な平面となっており、円周方向のいずれの位置も
等長である。下側の第２の円筒２６は上端縁が第１の円
筒２５と同様に入力軸２０の軸心に垂直な平面となって
いるが、下端縁は軸心には非垂直、また軸心に関し、非
対称な平面となっている。The upper first cylinder 25 has upper and lower end edges that are planes perpendicular to the axis of the input shaft 20, and has the same length at all positions in the circumferential direction. The lower second cylinder 26 has an upper edge that is a plane perpendicular to the axis of the input shaft 20 like the first cylinder 25, but the lower edge is not perpendicular to the axis and is flat with respect to the axis. , it is an asymmetrical plane.
即ち、円筒２６はその径方向に対称な位置のｍ個Ａから
他側（図示せず）までの−半周側Ｒ１が、その−側の軸
長を最長としている部分から他側に向かうに従って、軸
長が順次短くなり、他側において最短寸法となっている
。また他側からｍ個Ａまでの他生周側Ｒ２が、その他側
の軸長を最長としている部分からｍ個Ａに向かうに従っ
て軸長が順次短くなり、−側Ａにおいて最短寸法となっ
ている。That is, the cylinder 26 has m pieces of radially symmetrical positions A to the other side (not shown) as the -half circumferential side R1 goes from the part where the axis length on the - side is the longest to the other side. The axial length becomes gradually shorter, reaching the shortest dimension on the other side. In addition, the axial length of the other peripheral side R2 from the other side to m pieces A becomes shorter as it goes from the part where the axial length is the longest on the other side toward m pieces A, and becomes the shortest dimension on the − side A. .
つまり、円筒２６の下端縁は各半周側Ｒ１，Ｒ２におい
て軸線に対して同方向に同じ角度で傾斜しており、２つ
の歯部を有するラチェツト歯車状の構造となっている。That is, the lower end edge of the cylinder 26 is inclined in the same direction and at the same angle with respect to the axis on each half circumferential side R1, R2, and has a ratchet gear-like structure having two teeth.
下部軸２１ｃの上端部には非磁性体よりなる第２スリー
ブ２４ｂを外嵌固着し、その外周に非晶質合金の成形体
よりなる第３の円筒２７を入力軸２０と同心的に外嵌固
着しである。この円筒２７は前記円筒２６と同形状であ
り、上下方向を円筒２６と反対にして取付けている。こ
れらの第２．第３の円筒２６゜２７は、第１図及び第２
図に示している如く円筒２６の軸長が最長である部分と
円筒２７の軸長が最短である部分とを対向させて円筒２
６．２７を噛合させた状態にしており、円筒２６の下端
面と円筒２７の上端面とが対向し、また円筒２６．２７
の軸長が最長である部分の入力軸２０の軸心に平行して
いる端縁が互いに対向している。A second sleeve 24b made of a non-magnetic material is fitted onto the upper end of the lower shaft 21c, and a third cylinder 27 made of an amorphous alloy molded body is fitted onto the outer periphery of the second sleeve 24b concentrically with the input shaft 20. It is fixed. This cylinder 27 has the same shape as the cylinder 26, and is attached with the vertical direction opposite to that of the cylinder 26. The second of these. The third cylinder 26°27 is
As shown in the figure, the part of the cylinder 26 with the longest axial length and the part of the cylinder 27 with the shortest axial length are made to face each other.
6.27 are in mesh with each other, and the lower end surface of the cylinder 26 and the upper end surface of the cylinder 27 are opposed to each other, and the cylinder 26.27
The edges parallel to the axial center of the input shaft 20 at the portion where the axial length is the longest are opposed to each other.
そして、トーションバー２１ｂにトルクが作用していな
い状態において、夫々の対向端縁が適長離隔して平行状
態となるように円筒２６．２７がスリーブ２４ａ、 ２
４ｂに嵌着されている。When no torque is applied to the torsion bar 21b, the cylinders 26 and 27 are connected to the sleeves 24a and 2 so that their opposing edges are in a parallel state with an appropriate distance apart.
4b.
ところで、前記円筒２５．２６．２７は、例えば液体急
冷法又は固相反応法により得た非晶質合金の粉体を、一
体成形されたものからなっている。この非晶質合金には
、高透磁率として知られている非晶質合金の例えばＣｏ
−Ｚｒ系、Ｃｏ−Ｔｉ系、Ｃｏ−Ｎｂ系等のものを用
いている。そしてＣｏ −Ｚｒ系では飽和磁束密度が３
４８００ガウス、 ＦｅＢ５１Ｃでは３０００００ガウ
スが得られ、その場合従来のファライトで得られる飽和
磁束密度３０００〜５０００ガウスに比して著しく高い
飽和磁束密度を得ることができる。なお、円筒２５．２
６．２７は、非晶質合金の成形体以外に、例えば非晶質
合金の薄板を所要枚数積層又は巻回したものを用いて構
成してもよい。By the way, the cylinders 25, 26, and 27 are made of an amorphous alloy powder obtained by, for example, a liquid quenching method or a solid phase reaction method, and are integrally molded therein. This amorphous alloy includes, for example, Co, which is an amorphous alloy known to have high magnetic permeability.
-Zr type, Co-Ti type, Co-Nb type, etc. are used. And in the Co-Zr system, the saturation magnetic flux density is 3
4,800 Gauss, and 300,000 Gauss for FeB51C, which is significantly higher than the saturation magnetic flux density of 3,000 to 5,000 Gauss obtained with conventional farrite. In addition, cylinder 25.2
6.27 may be constructed using, for example, a required number of laminated or wound thin plates of amorphous alloy in addition to the molded body of amorphous alloy.
ケース２２の内側には、周設溝を形成しである断面コ字
状の非晶質合金の成形体からなるセンサ鉄心２８Ａ、
２８Ｂを内嵌して固着しである。センサ鉄心２８Ａは第
１．第２の円筒２５．２６とに十分に跨がり得る軸長寸
法を有し、その軸長方向中心位置が円筒２５と２６との
対向位置と略一致するように配設されている。センサ鉄
心２８Ｂは第１．第２の円筒２６゜２７とに十分に跨が
り得る軸長寸法を有し、その軸長寸法中心位置が円筒２
６と２７との軸長の軸長方向中心と略一致するように配
設されている。センサ鉄心２８Ａの溝には第１の磁気結
合検出コイル３１を、センサ鉄心２８Ｂの溝には第２の
磁気結合検出コイル３３を巻回しである。これらの第１
の磁気結合検出コイル３１及び第２の磁気結合コイル３
３は円筒２５゜２６及び２６．２７を囲繞するように配
設されている。Inside the case 22, there is a sensor core 28A formed of a molded amorphous alloy with a U-shaped cross section and a circumferential groove formed therein.
28B is fitted inside and fixed. The sensor core 28A is the first. It has an axial length dimension that can sufficiently span the second cylinders 25 and 26, and is arranged so that its center position in the axial direction substantially coincides with the opposing position of the cylinders 25 and 26. The sensor core 28B is the first. It has an axial length that can sufficiently straddle the second cylinder 26°27, and the center position of the axial length is located at the center of the second cylinder 26°27.
It is arranged so as to substantially coincide with the axial center of the axial lengths of 6 and 27. A first magnetic coupling detection coil 31 is wound in the groove of the sensor core 28A, and a second magnetic coupling detection coil 33 is wound in the groove of the sensor core 28B. The first of these
magnetic coupling detection coil 31 and second magnetic coupling coil 3
3 is arranged so as to surround the cylinders 25° 26 and 26.27.
なお、センサ鉄心２８＾、２８Ｂは前述した円筒２５．
２６゜２７と同様に非晶質合金の成形体で構成されてい
る。Note that the sensor cores 28^, 28B are the aforementioned cylinders 25.
Like 26°27, it is made of an amorphous alloy molded body.
これによって第１の磁気結合検出コイル３１は円筒２５
．２６に、また第２の磁気結合検出コイル３３は円筒２
６．２７に夫々電磁的に結合する。これらのコイル３１
．３３の巻回数は適宜であり、同一巻回数となっている
。この第１．第２の磁気結合検出コイル３１．３３の出
力をともに差動増幅器３４に与えておリ、差動増幅器３
４の出力をトルク出力ＴＳとしている。As a result, the first magnetic coupling detection coil 31 is connected to the cylinder 25.
．． 26, and the second magnetic coupling detection coil 33 is connected to the cylinder 2.
6.27, respectively. These coils 31
．． The number of turns of 33 is appropriate and is the same number of turns. This first. The outputs of the second magnetic coupling detection coils 31 and 33 are both supplied to the differential amplifier 34.
The output of No. 4 is taken as the torque output TS.
次に本発明のトルクセンサの動作について説明する。図
示しない発振器の発振動作により第１゜第２の磁気結合
検出コイル３１．３３に発生した磁束は円筒２５．２６
及び２６．２７と鎖交する。しかるに円筒２５．２６．
２７は高透磁率の非晶質合金からなるため円筒２５．２
６．２７には、従来の磁性体による場合に比べて著しく
高い磁束密度が得られ、円筒２５゜２６、２７と電磁結
合している第１．第２の磁気結合検出コイル３１．３３
には高い出力電圧が誘起することになる。Next, the operation of the torque sensor of the present invention will be explained. The magnetic flux generated in the first and second magnetic coupling detection coils 31.33 by the oscillation operation of an oscillator (not shown) is generated in the cylinder 25.26.
and 26.27. However, the cylinder 25.26.
Since 27 is made of an amorphous alloy with high magnetic permeability, it is a cylinder 25.2.
6.27, a significantly higher magnetic flux density is obtained than in the case of conventional magnetic materials, and the first. Second magnetic coupling detection coil 31.33
A high output voltage will be induced.
さて、第２図に示す如く円筒２７（又は２６）の上端縁
（又は下端縁）が時計回転方向（又は反時計回転方向）
に上側（又は下側）へ変位する傾斜面としている場合は
、図示しない操舵輪を時計回転方向（実線矢符方向）へ
回転させると、トーションバー２１ｂの働きによって円
筒２６が円筒２７に対して時計回転方向へ相対的に回転
し、円筒２６の下端縁（図面左端）と円筒２７の上端縁
（図面右端）との対向間隙が短縮して磁気結合が大とな
り、第２の磁気結合検出コイル３３の出力電圧が上昇す
る。Now, as shown in Fig. 2, the upper edge (or lower edge) of the cylinder 27 (or 26) is rotated clockwise (or counterclockwise).
If the surface is inclined upwardly (or downwardly), when the steering wheel (not shown) is rotated clockwise (in the direction of the solid line arrow), the cylinder 26 is moved relative to the cylinder 27 by the action of the torsion bar 21b. The relative rotation in the clockwise direction shortens the opposing gap between the lower end edge of the cylinder 26 (left end in the drawing) and the upper end edge of the cylinder 27 (right end in the drawing), increasing the magnetic coupling, and the second magnetic coupling detection coil The output voltage of 33 increases.
これに対して円筒２５と２６との磁気結合は一定である
から第１の磁気結合検出コイル３１の出力電圧は一定で
あり、差動増幅器３４のＩ・ルク出力は前述した相対回
転量に相応した正の値となる。On the other hand, since the magnetic coupling between the cylinders 25 and 26 is constant, the output voltage of the first magnetic coupling detection coil 31 is constant, and the I-lux output of the differential amplifier 34 corresponds to the above-mentioned relative rotation amount. will be a positive value.
一方、操舵輪を反・時計方向（破線矢符方向）へ回転さ
せると円筒２６の下端縁と円筒２７の上端縁との対向間
隙が拡大して磁気結合が小となり、第２の磁気結合検出
コイル３３の出力電圧が減少する。On the other hand, when the steering wheel is rotated counterclockwise (in the direction of the dashed arrow), the opposing gap between the lower end edge of the cylinder 26 and the upper end edge of the cylinder 27 expands, and the magnetic coupling becomes smaller, resulting in the second magnetic coupling detection. The output voltage of coil 33 decreases.
そして差動増幅器３４の出力は前述した相対回転量に相
応する負の値となる。Then, the output of the differential amplifier 34 becomes a negative value corresponding to the above-mentioned relative rotation amount.
そして、前記相対回転量は上部軸２１ａに操舵輪によっ
て加えられた回転トルクによって定まるから、結局は差
動増幅器３４の出力でトルクが検出できることになる。Since the amount of relative rotation is determined by the rotational torque applied to the upper shaft 21a by the steering wheel, the torque can be detected by the output of the differential amplifier 34.
また周囲温度が変化するとそれに相応して円筒２５と２
６との磁気結合が変化して、第１の磁気結合検出コイル
の出力電圧が変化するから差動増幅器３４の出力、即ち
検出トルクが温度補償される。Also, when the ambient temperature changes, the cylinders 25 and 2
Since the magnetic coupling with the differential amplifier 6 changes and the output voltage of the first magnetic coupling detection coil changes, the output of the differential amplifier 34, that is, the detected torque is temperature compensated.
ところで、前記した円筒２５．２６．２７は、高透磁率
の非晶質合金の成形体で構成しているから、各円筒２５
．２６．２７は高磁束密度になって、第１．第２の磁気
結合検出コイル３１．３３には高い出力電圧を誘起させ
得ることになる。By the way, since the cylinders 25, 26, and 27 described above are made of molded bodies of amorphous alloy with high magnetic permeability, each cylinder 25, 26, and
．． 26.27 has a high magnetic flux density and becomes the first. A high output voltage can be induced in the second magnetic coupling detection coils 31, 33.
したがって、本発明によれば、第１．第２の磁気結合検
出コイル３１．３℃には高い出力電圧が得られるから、
その出力電圧を増幅せずにそのまま取扱うことができる
。また外部の電磁波等のノイズ又は外部磁界による影響
をうけることがなく、トーションバーに作用したトルク
に相応する高い出力電圧を得ることができ、検出精度が
高いトルクセンサを提供することができる。Therefore, according to the present invention, the first. Since a high output voltage can be obtained from the second magnetic coupling detection coil at 31.3°C,
The output voltage can be handled as is without amplification. Further, it is possible to provide a torque sensor that is not affected by noise such as external electromagnetic waves or external magnetic fields, can obtain a high output voltage corresponding to the torque acting on the torsion bar, and has high detection accuracy.
なお、本実施例においては、円筒２６と２７とが対向す
る軸端縁を、ともに同方向の傾斜面になしたが、その両
輪端縁を入力軸２０に鉛直面として、夫々の軸端縁に多
数の歯部を等ピッチで周設させたものであってもよい。In this embodiment, the opposing shaft edges of the cylinders 26 and 27 are both sloped in the same direction. A large number of tooth portions may be provided around the circumference at equal pitches.
（発明の効果）
以上詳述したように本発明は、作用した回転トルクに関
連して相対的に回転する２つの円筒を、透磁率が高い非
晶質合金で構成したから、磁気結合検出コイルに高い出
力電圧を誘起させることができる。したがって前記出力
電圧を増幅するための増幅器を必要とせず、またその出
力電圧は外部の電磁波の如きノイズ、又は外部磁界の影
響をうけることがない。故に本発明によればトルクを高
精度に検出し得るトルクセンサを提供できる優れた効果
を奏する。(Effects of the Invention) As detailed above, in the present invention, since the two cylinders that rotate relative to each other in relation to the applied rotational torque are made of an amorphous alloy with high magnetic permeability, the magnetic coupling detection coil can induce a high output voltage. Therefore, there is no need for an amplifier to amplify the output voltage, and the output voltage is not affected by external noise such as electromagnetic waves or external magnetic fields. Therefore, the present invention provides an excellent effect of providing a torque sensor that can detect torque with high accuracy.
第１図は本発明に係るトルクセンサの半裁断面図、第２
図はその内側部材の斜視図、第３図は磁気結合の変化に
よりトルクを検出するトルクセンサの半裁部分断面図で
ある。
２０・・・入力軸 ２１ａ・・・上部軸 ２１ｂ・・・
トーションバー ２１ｃ・・・下部軸 ２５．２６．２
７・・・円筒２８Ａ、２８Ｂ・・・センサ鉄心 ３１・
・・第１の磁気結合検出コイル ３３・・・第２の磁気
結合検出コイル特 許 出願人 光洋精工株式会社
代理人 弁理士 河 野 登 夫
Ｔ５
篤 １［２１
坂
ｖ３２ 日FIG. 1 is a half-cut sectional view of a torque sensor according to the present invention, and FIG.
The figure is a perspective view of the inner member, and FIG. 3 is a half-cut sectional view of a torque sensor that detects torque by changes in magnetic coupling. 20... Input shaft 21a... Upper shaft 21b...
Torsion bar 21c...lower shaft 25.26.2
7...Cylinder 28A, 28B...Sensor core 31.
...First magnetic coupling detection coil 33...Second magnetic coupling detection coil patent Applicant Koyo Seiko Co., Ltd. Agent Patent attorney Tomio Kono T5 Atsushi 1 [21 Saka v32]
Claims (1)
と連動し、該２つの軸の相対回転により磁気結合状態が
変化する２つの円筒を備え、該２つの円筒の磁気結合状
態を検出してトルクを検出するトルクセンサであって、 前記２つの円筒を非晶質合金により構成し てあることを特徴とするトルクセンサ。1. It is equipped with two cylinders that operate in conjunction with each of two shafts connected via a torsion bar, and whose magnetic coupling state changes with the relative rotation of the two shafts, and detects the magnetic coupling state of the two cylinders to generate torque. What is claimed is: 1. A torque sensor for detecting a torque sensor, wherein the two cylinders are made of an amorphous alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15081088A JPH01318933A (en) | 1988-06-17 | 1988-06-17 | Torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15081088A JPH01318933A (en) | 1988-06-17 | 1988-06-17 | Torque sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01318933A true JPH01318933A (en) | 1989-12-25 |
Family
ID=15504916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15081088A Pending JPH01318933A (en) | 1988-06-17 | 1988-06-17 | Torque sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01318933A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5520059A (en) * | 1991-07-29 | 1996-05-28 | Magnetoelastic Devices, Inc. | Circularly magnetized non-contact torque sensor and method for measuring torque using same |
| US5591925A (en) * | 1991-07-29 | 1997-01-07 | Garshelis; Ivan J. | Circularly magnetized non-contact power sensor and method for measuring torque and power using same |
| US6047605A (en) * | 1997-10-21 | 2000-04-11 | Magna-Lastic Devices, Inc. | Collarless circularly magnetized torque transducer having two phase shaft and method for measuring torque using same |
| JP2002310819A (en) * | 2001-04-13 | 2002-10-23 | Kayaba Ind Co Ltd | Torque sensor |
| JP2013205208A (en) * | 2012-03-28 | 2013-10-07 | Showa Corp | Torque detection device, and electric power steering device |
| US10293481B1 (en) | 2016-12-14 | 2019-05-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Relative deflection detector |
-
1988
- 1988-06-17 JP JP15081088A patent/JPH01318933A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5520059A (en) * | 1991-07-29 | 1996-05-28 | Magnetoelastic Devices, Inc. | Circularly magnetized non-contact torque sensor and method for measuring torque using same |
| US5591925A (en) * | 1991-07-29 | 1997-01-07 | Garshelis; Ivan J. | Circularly magnetized non-contact power sensor and method for measuring torque and power using same |
| US5708216A (en) * | 1991-07-29 | 1998-01-13 | Magnetoelastic Devices, Inc. | Circularly magnetized non-contact torque sensor and method for measuring torque using same |
| US6047605A (en) * | 1997-10-21 | 2000-04-11 | Magna-Lastic Devices, Inc. | Collarless circularly magnetized torque transducer having two phase shaft and method for measuring torque using same |
| US6145387A (en) * | 1997-10-21 | 2000-11-14 | Magna-Lastic Devices, Inc | Collarless circularly magnetized torque transducer and method for measuring torque using same |
| US6260423B1 (en) | 1997-10-21 | 2001-07-17 | Ivan J. Garshelis | Collarless circularly magnetized torque transducer and method for measuring torque using same |
| US6553847B2 (en) | 1997-10-21 | 2003-04-29 | Magna-Lastic Devices, Inc. | Collarless circularly magnetized torque transducer and method for measuring torque using the same |
| JP2002310819A (en) * | 2001-04-13 | 2002-10-23 | Kayaba Ind Co Ltd | Torque sensor |
| JP2013205208A (en) * | 2012-03-28 | 2013-10-07 | Showa Corp | Torque detection device, and electric power steering device |
| US10293481B1 (en) | 2016-12-14 | 2019-05-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Relative deflection detector |
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