JPH1151789A - Torque sensor - Google Patents
Torque sensorInfo
- Publication number
- JPH1151789A JPH1151789A JP22754897A JP22754897A JPH1151789A JP H1151789 A JPH1151789 A JP H1151789A JP 22754897 A JP22754897 A JP 22754897A JP 22754897 A JP22754897 A JP 22754897A JP H1151789 A JPH1151789 A JP H1151789A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- covering member
- coil
- detection
- covering
- 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
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
-
- 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
- G01L3/105—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 inductive means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本件発明は、例えば操舵トル
クに応じた操舵補助力を付与するパワーステアリング装
置において、その操舵トルクを検出するのに適したトル
クセンサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque sensor suitable for detecting a steering torque in a power steering apparatus for applying a steering assist force according to, for example, a steering torque.
【０００２】[0002]
【従来の技術】例えば車両のパワーステアリング装置に
おいては、ステアリングホイールの回転を入力シャフト
から出力シャフトを介して車輪に伝達する際、入力シャ
フトから出力シャフトに伝達される操舵トルクを、図２
０に示すようなトルクセンサ５０１により検出し、その
検出トルクの大きさに応じて操舵補助力を付与してい
る。2. Description of the Related Art In a vehicle power steering system, for example, when the rotation of a steering wheel is transmitted from an input shaft to a wheel via an output shaft, a steering torque transmitted from the input shaft to the output shaft is shown in FIG.
The torque is detected by a torque sensor 501 as indicated by 0, and a steering assist force is applied according to the magnitude of the detected torque.
【０００３】そのトルクセンサ５０１は、ハウジング５
０２と、トーションバー５０７を介して操舵トルクに応
じて弾性的に相対回転可能に連結される入力シャフト５
０３と出力シャフト５０４を有する。その入力シャフト
５０３に固定される磁性材製の第１検出リング５２１と
出力シャフト５０４に固定される磁性材製の第２検出リ
ング５２３の対向端面に、それぞれ歯５２１ａ、５２３
ａが周方向に沿って複数設けられている。その第１検出
リング５２１の他端側は一端側よりも外径の小さな小径
部５２１ｂとされている。The torque sensor 501 includes a housing 5
02 and an input shaft 5 connected via a torsion bar 507 so as to be elastically rotatable relative to the steering torque.
03 and an output shaft 504. Teeth 521 a and 523 are respectively provided on opposite end surfaces of a first detection ring 521 made of a magnetic material fixed to the input shaft 503 and a second detection ring 523 made of a magnetic material fixed to the output shaft 504.
a are provided along the circumferential direction. The other end of the first detection ring 521 is a small-diameter portion 521b having an outer diameter smaller than that of the one end.
【０００４】そのハウジング５０２に、挿入される磁性
材製の第１コイルホルダー５３１と磁性材製の第２コイ
ルホルダー５３２とに、第１検出コイル５３３と第２検
出コイル５３４が保持される。図２１に示すように、第
１検出コイル５３３は抵抗５４５を介して発振器５４６
に接続され、第２検出コイル５３４は抵抗５４７を介し
て発振器５４６に接続され、各検出コイル５３３、５３
４は差動増幅回路５４８に接続される。その第１検出コ
イル５３３が磁束を発生することで、第１検出リング５
２１、第２検出リング５２３及び第１コイルホルダー５
３１を構成部材として含む磁気回路が構成され、また、
第２検出コイル５３４が磁束を発生することで、第１検
出リング５２１および第２コイルホルダー５３２を構成
部材として含む磁気回路が構成される。A first coil 533 and a second coil 534 are held by a first coil holder 531 made of a magnetic material and a second coil holder 532 made of a magnetic material inserted into the housing 502. As shown in FIG. 21, the first detection coil 533 is connected to an oscillator 546 via a resistor 545.
, And the second detection coil 534 is connected to the oscillator 546 via the resistor 547.
4 is connected to the differential amplifier circuit 548. When the first detection coil 533 generates a magnetic flux, the first detection ring 5
21, second detection ring 523 and first coil holder 5
A magnetic circuit including 31 as a constituent member is configured,
When the second detection coil 534 generates magnetic flux, a magnetic circuit including the first detection ring 521 and the second coil holder 532 as constituent members is configured.
【０００５】その入力シャフト５０３から出力シャフト
５０４へのトルク伝達により第１検出リング５２１と第
２検出リング５２３とが相対的に回転すると、各検出リ
ング５２１、５２３の歯５２１ａ、５２３ａの対向面積
が変化する。その面積変化により、その磁気回路の磁気
抵抗が変化する。その磁気抵抗の変化に基づき第１検出
コイル５３３の出力が変化し、その出力に対応して伝達
トルクが検出される。その小径部５２１ｂの外径は、操
舵トルクの作用していない状態で、その第１検出リング
５２１及び第２コイルホルダー５３２により構成される
磁気回路の磁気抵抗と、第１検出リング５２１、第２検
出リング５２３及び第１コイルホルダー５３１により構
成される磁気回路の磁気抵抗とが等しくなるように設定
される。これにより、温度変動による第１検出コイル５
３３の出力変動は、温度変動による第２検出コイル５３
４の出力変動に等しくなるので、差動増幅回路５４８に
より打ち消され、伝達トルクの検出値の温度による変動
が補償される。その差動増幅回路５４８から出力される
伝達トルクに対応した信号に応じて図外操舵補助力発生
用モータが駆動され、操舵補助力が付与される。When the first detection ring 521 and the second detection ring 523 rotate relatively by the transmission of torque from the input shaft 503 to the output shaft 504, the facing areas of the teeth 521a and 523a of the detection rings 521 and 523 are reduced. Change. The change in the area changes the magnetic resistance of the magnetic circuit. The output of the first detection coil 533 changes based on the change in the magnetic resistance, and the transmission torque is detected according to the output. The outer diameter of the small diameter portion 521b is determined by the magnetic resistance of the magnetic circuit formed by the first detection ring 521 and the second coil holder 532 and the first detection ring 521, The magnetic resistance of the magnetic circuit formed by the detection ring 523 and the first coil holder 531 is set to be equal. Thereby, the first detection coil 5 due to the temperature fluctuation
The output fluctuation of the third detection coil 53 due to the temperature fluctuation
4 and is canceled out by the differential amplifier circuit 548, and the fluctuation of the detected value of the transmission torque due to the temperature is compensated. A motor for generating a steering assist force (not shown) is driven according to a signal corresponding to the transmission torque output from the differential amplifier circuit 548, and a steering assist force is applied.
【０００６】[0006]
【発明が解決しようとする課題】従来のトルクセンサ５
０１にあっては、トルク検出用の磁気回路を構成する検
出リング５２１、５２３やコイルホルダー５３１、５３
２は、焼結成形された後に機械加工されている。その機
械加工時に作用する外力や残留応力により磁気特性が変
動し、トルクの検出精度が低下する。その機械加工によ
り加工コストが増大する。また、ハウジング５０２の内
周に挿入されるコイルホルダー５３１、５３２が、温度
変動による熱変形によりハウジングから大きな応力を受
けるのを防止するため、ハウジング５０２の内周とコイ
ルホルダー５３１、５３２の外周との間に高精度にクリ
アランスを設定する必要がある。そのため、コイルホル
ダー５３１、５３２は高い寸法精度を要求され、組み付
け性も悪い。さらに、コイルホルダー５３１、５３２は
筒状の周壁部５３１ａ、５３２ａと、この周壁部５３１
ａ、５３２ａの内周に嵌め合わされる環状の蓋体５３１
ｂ、５３２ｂとを有し、各コイルホルダー５３１、５３
２により保持される検出コイル５３３、５３４は絶縁材
製のボビン５３３ａ、５３４ａに導線５３３ｂ、５３４
ｂを巻くことで構成されている。そのため、コイルホル
ダー５３１、５３２とコイル５３３、５３４の組立体は
部品点数が多く、組み付け性が悪いという問題がある。A conventional torque sensor 5
01, detection rings 521 and 523 and coil holders 531 and 53 forming a magnetic circuit for torque detection.
2 is machined after being sintered. Magnetic characteristics fluctuate due to external force and residual stress acting during the machining, and the accuracy of torque detection decreases. The machining increases the machining cost. Further, in order to prevent the coil holders 531 and 532 inserted into the inner circumference of the housing 502 from receiving a large stress from the housing due to thermal deformation due to temperature fluctuation, the inner circumference of the housing 502 and the outer circumference of the coil holders 531 and 532 are fixed. It is necessary to set the clearance with high precision during the period. Therefore, the coil holders 531 and 532 are required to have high dimensional accuracy and have poor assemblability. Further, the coil holders 531 and 532 include a cylindrical peripheral wall portion 531a and 532a and the peripheral wall portion 531a.
a, an annular lid 531 fitted on the inner periphery of 532a
b, 532b, and each of the coil holders 531, 53
The detection coils 533 and 534 held by the lead wires 533b and 534 are connected to bobbins 533a and 534a made of insulating material.
b. Therefore, there is a problem that the assembly of the coil holders 531 and 532 and the coils 533 and 534 has a large number of parts, and the assemblability is poor.
【０００７】本発明は、上記問題を解決することのでき
るトルクセンサを提供することを目的とする。An object of the present invention is to provide a torque sensor that can solve the above-mentioned problem.
【０００８】[0008]
【課題を解決するための手段】本発明は、磁気回路にお
ける磁気抵抗の変化に基づきトルクを検出可能なトルク
センサにおいて、その磁気回路の構成部材の少なくとも
一つが、合成樹脂製の基材中に磁性粉末を分散させるこ
とで構成される磁性材料から型成形されていることを特
徴とする。本発明の構成によれば、トルク検出用磁気回
路の構成部材を磁性材料から型成形するので、その構成
部材に機械加工による外力や残留応力が作用することは
ない。これにより、その磁気回路の磁気特性を安定化さ
せ、トルクの検出精度を向上できる。また、機械加工を
なくして加工コストを低減できる。According to the present invention, there is provided a torque sensor capable of detecting a torque based on a change in magnetic resistance in a magnetic circuit, wherein at least one of the components of the magnetic circuit is provided in a synthetic resin base material. It is characterized by being molded from a magnetic material constituted by dispersing magnetic powder. According to the configuration of the present invention, since the constituent members of the magnetic circuit for torque detection are molded from a magnetic material, no external force or residual stress due to machining is applied to the constituent members. Thereby, the magnetic characteristics of the magnetic circuit can be stabilized, and the accuracy of torque detection can be improved. In addition, machining costs can be reduced by eliminating machining.
【０００９】本発明のトルクセンサにおいて、その磁性
材料から型成形される磁気回路の構成部材の少なくとも
一つの少なくとも一部が、その磁性材料よりも靱性の高
い合成樹脂材から成形される被覆部材により被覆されて
いるのが好ましい。これにより、トルク検出用磁気回路
の構成部材を構成する磁性材料の脆さを、その被覆部材
を構成する合成樹脂材の靱性により補うことができる。In the torque sensor of the present invention, at least a part of at least one of the components of the magnetic circuit molded from the magnetic material is formed of a covering member molded from a synthetic resin material having higher toughness than the magnetic material. Preferably it is coated. Thereby, the brittleness of the magnetic material constituting the constituent member of the torque detecting magnetic circuit can be compensated for by the toughness of the synthetic resin material constituting the covering member.
【００１０】その磁性材料から型成形される磁気回路の
構成部材として、ハウジングに挿入されるコイルホルダ
ーを備え、そのコイルホルダーの外周の少なくとも一部
が、その磁性材料よりも靱性の高い合成樹脂材から成形
される被覆部材により被覆され、そのコイルホルダー
は、その被覆部材を介してハウジングに圧入されている
のが好ましい。これにより、そのコイルホルダーを構成
する磁性材料の脆さを、その被覆部材を構成する合成樹
脂材の靱性により補うことができる。しかも、そのコイ
ルホルダーをハウジングに圧入する際に作用する力を靱
性の高い被覆部材により受けることができるので、その
コイルホルダーに作用する荷重の変動が小さくなる。こ
れにより、そのコイルホルダーを含む磁気回路における
磁気特性の変動が小さくなるのでトルク検出精度が低下
するのを防止できる。さらに、そのコイルホルダーを覆
う被覆部材に一体的に形成される弾性変形可能な凸部を
介して、その被覆部材はハウジングに圧入されるのが好
ましい。その被覆部材を弾性変形可能な凸部を介してハ
ウジングの内周により支持することで、コイルホルダー
の外周とハウジングの内周との間に高精度のクリアラン
スを設定することなく、温度変動による熱変形によりコ
イルホルダーがハウジングに押し付けられて大きな力を
受けるのを防止できる。これにより、そのコイルホルダ
ーを高精度に加工する必要がなく、加工コストを低減で
き、組み付け性を向上できる。[0010] As a component of a magnetic circuit molded from the magnetic material, a coil holder inserted into a housing is provided, and at least a part of the outer periphery of the coil holder is a synthetic resin material having higher toughness than the magnetic material. It is preferable that the coil holder is covered with a covering member formed from a resin material, and the coil holder is pressed into the housing via the covering member. Thereby, the brittleness of the magnetic material constituting the coil holder can be compensated for by the toughness of the synthetic resin material constituting the covering member. In addition, since the force acting upon press-fitting the coil holder into the housing can be received by the covering member having high toughness, the variation in the load acting on the coil holder is reduced. As a result, fluctuations in the magnetic characteristics of the magnetic circuit including the coil holder are reduced, so that it is possible to prevent a decrease in torque detection accuracy. Further, it is preferable that the covering member is press-fitted into the housing via an elastically deformable convex portion formed integrally with the covering member covering the coil holder. By supporting the covering member by the inner periphery of the housing via the elastically deformable convex portion, heat due to temperature fluctuation can be set without setting a high-precision clearance between the outer periphery of the coil holder and the inner periphery of the housing. The deformation prevents the coil holder from being pressed against the housing and receiving a large force. Thereby, it is not necessary to process the coil holder with high precision, the processing cost can be reduced, and the assembling property can be improved.
【００１１】本発明のトルクセンサにおいて、その磁性
材料から型成形される磁気回路の構成部材として、ハウ
ジングに挿入されるコイルホルダーを備え、そのコイル
ホルダーは、筒状の周壁部と、この周壁部の内周に嵌め
合わされる環状の蓋体とを有し、その蓋体の少なくとも
一部が、その磁性材料よりも靱性の高い絶縁性の合成樹
脂材から成形される被覆部材により被覆され、その被覆
部材に、その磁気回路の構成部材を通過する磁束を発生
する検出コイルを構成する導線の巻き付け部が一体化さ
れているのが好ましい。これにより、検出コイルを構成
する導線を巻くための専用の絶縁性部材が不要になり、
部品点数を低減し、組み付け性を向上できる。In the torque sensor of the present invention, a coil holder inserted into a housing is provided as a component of a magnetic circuit molded from the magnetic material. The coil holder has a cylindrical peripheral wall, An annular lid fitted to the inner periphery of the cover, at least a part of the lid is covered with a covering member molded from an insulating synthetic resin material having a higher toughness than the magnetic material, It is preferable that the covering member is integrally formed with a winding portion of a lead wire constituting a detection coil for generating a magnetic flux passing through a component of the magnetic circuit. This eliminates the need for a dedicated insulating member for winding the conductive wire constituting the detection coil,
The number of parts can be reduced, and the assemblability can be improved.
【００１２】その磁性材料から型成形される磁気回路の
構成部材として、トルク伝達シャフトに挿入される検出
リングを備え、その検出リングの内周の少なくとも一部
が、その磁性材料よりも靱性の高い合成樹脂材から成形
される被覆部材により被覆され、その検出リングは、そ
の被覆部材を介して前記トルク伝達シャフトに圧入され
ているのが好ましい。これにより、その検出リングを構
成する磁性材料の脆さを、その被覆部材を構成する合成
樹脂材の靱性により補うことができる。しかも、その検
出リングをトルク伝達シャフトに圧入する際に作用する
力を靱性の高い被覆部材により受けることができるの
で、その検出リングに作用する荷重の変動が小さくな
る。これにより、その検出リングを含む磁気回路におけ
る磁気特性の変動が小さくなるのでトルク検出精度が低
下するのを防止できる。As a component of a magnetic circuit molded from the magnetic material, a detection ring inserted into the torque transmission shaft is provided, and at least a part of the inner circumference of the detection ring has higher toughness than the magnetic material. It is preferable that the detection ring is covered with a covering member molded from a synthetic resin material, and the detection ring is press-fitted into the torque transmission shaft via the covering member. Thereby, the brittleness of the magnetic material constituting the detection ring can be compensated for by the toughness of the synthetic resin material constituting the covering member. In addition, since the force acting upon press-fitting the detection ring into the torque transmission shaft can be received by the covering member having high toughness, the variation in the load acting on the detection ring is reduced. As a result, fluctuations in the magnetic characteristics of the magnetic circuit including the detection ring are reduced, so that it is possible to prevent a decrease in torque detection accuracy.
【００１３】[0013]
【発明の実施の形態】図１〜図１０を参照して本発明の
第１実施形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.
【００１４】図１に示すトルクセンサ１は、車両のパワ
ーステアリング装置における操舵トルクを検出する。A torque sensor 1 shown in FIG. 1 detects a steering torque in a power steering device of a vehicle.
【００１５】そのトルクセンサ１は、アルミ材製のハウ
ジング２と、入力シャフト３と、出力シャフト４とを備
えている。そのハウジング２の一端にステアリングコラ
ム５が連結されている。その入力シャフト３の外周は、
そのステアリングコラム５の内周によりブッシュ１２を
介し支持される。その出力シャフト４の外周は、ハウジ
ング２の内周により軸受１３、１４を介し支持される。The torque sensor 1 includes an aluminum housing 2, an input shaft 3, and an output shaft 4. A steering column 5 is connected to one end of the housing 2. The outer circumference of the input shaft 3 is
The inner periphery of the steering column 5 is supported via a bush 12. The outer circumference of the output shaft 4 is supported by the inner circumference of the housing 2 via bearings 13 and 14.
【００１６】そのステアリングコラム５に覆われたステ
アリングシャフト６の一端が、その入力シャフト３の一
端にピン８により連結されている。そのステアリングシ
ャフト６の他端はステアリングホイール（図示省略）に
接続される。その入力シャフト３と出力シャフト４にト
ーションバー７が挿入される。そのトーションバー７
は、一端が入力シャフト３の一端に上記ピン８により連
結され、他端が出力シャフト４にピン１０により連結さ
れている。これにより、その入力シャフト３と出力シャ
フト４は操舵抵抗に応じたトーションバー７の捩じれに
より、弾性的に相対回転可能とされている。One end of a steering shaft 6 covered by the steering column 5 is connected to one end of the input shaft 3 by a pin 8. The other end of the steering shaft 6 is connected to a steering wheel (not shown). The torsion bar 7 is inserted into the input shaft 3 and the output shaft 4. The torsion bar 7
Has one end connected to one end of the input shaft 3 by the pin 8 and the other end connected to the output shaft 4 by a pin 10. As a result, the input shaft 3 and the output shaft 4 can be relatively elastically rotated by the torsion of the torsion bar 7 according to the steering resistance.
【００１７】その出力シャフト４の回転が、例えばラッ
クピニオン式ステアリングギア等を介して車輪に伝達さ
れることで、その車輪が転舵される。その出力シャフト
４の外周にウォームホイール１５が嵌め合わされる。そ
のウォームホイール１５は操舵補助力発生用モータの出
力シャフトに取り付けられたウォーム１６に噛み合う。The rotation of the output shaft 4 is transmitted to the wheels via, for example, a rack and pinion type steering gear, so that the wheels are steered. A worm wheel 15 is fitted on the outer periphery of the output shaft 4. The worm wheel 15 meshes with a worm 16 attached to an output shaft of a steering assist force generating motor.
【００１８】その入力シャフト３の外周に、磁性材製の
第１検出リング２１が嵌め合わされると共にピン２２に
より固定されている。その出力シャフト４の外周に、磁
性材製の第２検出リング２３が圧入されている。その第
１検出リング２１の一端面と第２検出リング２３の他端
面とは互いに対向するように配置され、各検出リング２
１、２３の対向端面に、それぞれ歯２１ａ、２３ａが周
方向に沿って複数設けられている。その第１検出リング
２１の他端側は一端側よりも外径の小さな小径部２１ｂ
とされている。A first detection ring 21 made of a magnetic material is fitted around the outer periphery of the input shaft 3 and is fixed by a pin 22. A second detection ring 23 made of a magnetic material is press-fitted on the outer periphery of the output shaft 4. One end face of the first detection ring 21 and the other end face of the second detection ring 23 are arranged so as to face each other.
A plurality of teeth 21a and 23a are provided along the circumferential direction on the opposing end surfaces of the first and the third ends 23, respectively. The other end of the first detection ring 21 has a small diameter portion 21b having an outer diameter smaller than the one end.
It has been.
【００１９】そのハウジング２に、磁性材製の第１コイ
ルホルダー３１と磁性材製の第２コイルホルダー３２と
が内蔵されている。両コイルホルダー３１、３２の外周
は、後述の第１、第２被覆部材６１、６２により被覆さ
れる。その第１コイルホルダー３１により第１検出コイ
ル３３が保持され、第２コイルホルダー３２により第２
検出コイル３４が保持されている。その第１コイルホル
ダー３１と第２コイルホルダー３２との間にスペーサ５
１が配置されている。その第１、第２コイルホルダー３
１、３２は、ハウジング２の内周に嵌め合わされた止め
輪５５とハウジング２の内面２ｄとの間に、被覆部材６
１、６２を介して挟まれる。The housing 2 contains a first coil holder 31 made of a magnetic material and a second coil holder 32 made of a magnetic material. The outer peripheries of both coil holders 31 and 32 are covered by first and second covering members 61 and 62 described later. The first detection coil 33 is held by the first coil holder 31, and the second detection coil 33 is held by the second coil holder 32.
The detection coil 34 is held. A spacer 5 is provided between the first coil holder 31 and the second coil holder 32.
1 is arranged. The first and second coil holders 3
1 and 32 are provided between the retaining ring 55 fitted on the inner periphery of the housing 2 and the inner surface 2 d of the housing 2.
1 and 62.
【００２０】各検出コイル３３、３４と、ハウジング２
の外部に配置されるプリント基板４１とが、ハウジング
２に形成された通孔に嵌め合わされるグロメット４９に
通される配線４２、４３を介して接続される。そのプリ
ント基板４１に、図３に示す信号処理回路が形成されて
いる。すなわち、第１検出コイル３３は抵抗４５を介し
て発振器４６に接続され、第２検出コイル３４は抵抗４
７を介して発振器４６に接続され、各検出コイル３３、
３４は差動増幅回路４８に接続される。これにより、第
１検出コイル３３が第１検出リング２１、第２検出リン
グ２３及び第１コイルホルダー３１を通過する磁束を発
生することで、第１検出リング２１、第２検出リング２
３及び第１コイルホルダー３１を構成部材として含む磁
気回路が構成される。また、第２検出コイル３４が第１
検出リング２１および第２コイルホルダー３２を通過す
る磁束を発生することで、第１検出リング２１および第
２コイルホルダー３２を構成部材として含む磁気回路を
構成する。Each of the detection coils 33 and 34 and the housing 2
And a printed circuit board 41 arranged outside of the housing 2 are connected via wires 42 and 43 passed through grommets 49 fitted into through holes formed in the housing 2. The signal processing circuit shown in FIG. 3 is formed on the printed board 41. That is, the first detection coil 33 is connected to the oscillator 46 via the resistor 45, and the second detection coil 34 is connected to the resistor 4
7 and connected to the oscillator 46, and each detection coil 33,
34 is connected to a differential amplifier circuit 48. Thus, the first detection coil 33 generates a magnetic flux that passes through the first detection ring 21, the second detection ring 23, and the first coil holder 31, so that the first detection ring 21, the second detection ring 2
A magnetic circuit including the third and first coil holders 31 as constituent members is configured. In addition, the second detection coil 34
By generating a magnetic flux passing through the detection ring 21 and the second coil holder 32, a magnetic circuit including the first detection ring 21 and the second coil holder 32 as constituent members is configured.
【００２１】その入力シャフト３から出力シャフト４へ
のトルク伝達によりトーションバー７が弾性的に捩れ、
第１検出リング２１と第２検出リング２３とが相対的に
回転すると、第１検出リング２１の歯２１ａと第２検出
リング２３の歯２３ａとの対向面積が変化する。その面
積変化により、その磁気回路の磁気抵抗が変化する。そ
の磁気抵抗の変化に基づき第１検出コイル３３の出力が
変化し、その出力に対応して伝達トルクが検出される。
その小径部２１ｂの外径は、操舵トルクの作用していな
い状態で、その第１検出リング２１及び第２コイルホル
ダー３２により構成される磁気回路の磁気抵抗と、第１
検出リング２１、第２検出リング２３及び第１コイルホ
ルダー３１により構成される磁気回路の磁気抵抗とが等
しくなるように設定される。これにより、温度変動によ
る第１検出コイル３３の出力変動は、温度変動による第
２検出コイル３４の出力変動に等しくなるので差動増幅
回路４８により打ち消され、伝達トルクの検出値の温度
による変動が補償される。その差動増幅回路４８から出
力される伝達トルクに対応した信号に応じてモータが駆
動され、前記ウォーム１６、ウォームホイール１５を介
して出力シャフト４に操舵補助力が付与される。The torque transmission from the input shaft 3 to the output shaft 4 causes the torsion bar 7 to be elastically twisted,
When the first detection ring 21 and the second detection ring 23 rotate relatively, the facing area between the teeth 21a of the first detection ring 21 and the teeth 23a of the second detection ring 23 changes. The change in the area changes the magnetic resistance of the magnetic circuit. The output of the first detection coil 33 changes based on the change in the magnetic resistance, and the transmission torque is detected according to the output.
The outer diameter of the small diameter portion 21b is determined by the magnetic resistance of the magnetic circuit formed by the first detection ring 21 and the second coil holder 32 when the steering torque is not acting,
The magnetic resistance of the magnetic circuit formed by the detection ring 21, the second detection ring 23, and the first coil holder 31 is set to be equal. As a result, the output fluctuation of the first detection coil 33 due to the temperature fluctuation becomes equal to the output fluctuation of the second detection coil 34 due to the temperature fluctuation. Therefore, the output fluctuation is canceled by the differential amplifier circuit 48, and the fluctuation of the detected value of the transmission torque due to the temperature is reduced. Compensated. The motor is driven according to a signal corresponding to the transmission torque output from the differential amplifier circuit 48, and a steering assist force is applied to the output shaft 4 via the worm 16 and the worm wheel 15.
【００２２】図２に示すように、第１コイルホルダー３
１は、第１検出コイル３３の外周を覆う円筒形の周壁部
３１ａと、第１検出コイル３３の一端側を覆う環状の側
壁部３１ｂと、第１検出コイル３３の他端側を覆う環状
の蓋体３１ｃとを有する。第２コイルホルダー３２は、
第２検出コイル３４の外周を覆う円筒形の周壁部３２ａ
と、第２検出コイル３４の一端側を覆う環状の側壁部３
２ｂと、第２検出コイル３４の他端側を覆う環状の蓋体
３２ｃとを有する。各コイルホルダー３１、３２におい
て、周壁部３１ａ、３２ａと側壁部３１ｂ、３２ｂとは
一体的に形成され、蓋体３１ｃ、３２ｃは周壁部３１
ａ、３２ａの内周に嵌め合わされる。なお、各蓋体３１
ｃ、３２ｃには上記配線４２、４３の通過用切欠３１
ｃ′、３２ｃ′が形成されている。As shown in FIG. 2, the first coil holder 3
Reference numeral 1 denotes a cylindrical peripheral wall portion 31a that covers the outer periphery of the first detection coil 33, an annular side wall portion 31b that covers one end side of the first detection coil 33, and an annular wall portion that covers the other end side of the first detection coil 33. And a lid 31c. The second coil holder 32
A cylindrical peripheral wall portion 32a that covers the outer periphery of the second detection coil 34
And an annular side wall 3 covering one end of the second detection coil 34
2b and an annular lid 32c that covers the other end of the second detection coil 34. In each of the coil holders 31 and 32, the peripheral wall portions 31a and 32a and the side wall portions 31b and 32b are integrally formed, and the lids 31c and 32c are
a and 32a. In addition, each lid 31
The notches 31 for passing the wirings 42 and 43 are provided in c and 32c.
c 'and 32c' are formed.
【００２３】各検出コイル３３、３４は、絶縁材製のボ
ビン３３ａ、３４ａに導線３３ｂ、３４ｂを巻き付ける
ことで構成されている。Each of the detection coils 33 and 34 is constituted by winding conductive wires 33b and 34b around bobbins 33a and 34a made of an insulating material.
【００２４】上記磁気回路の構成部材である各コイルホ
ルダー３１、３２と各検出リング２１、２３は、合成樹
脂製の基材中に磁性粉末を分散させることで構成される
磁性材料から型成形されている。その型成形法として、
例えば射出成形法を採用できる。その合成樹脂材は特に
限定されず、例えばナイロンを用いることができる。そ
の磁性粉末も特に限定されず、例えばＭｎ‐Ｚｎ‐Ｆｒ
系磁性粉末やＮｉ‐Ｚｎ‐Ｆｒ系磁性粉末を用いること
ができ、市販品として戸田工業製のＭｎ‐Ｚｎ‐Ｆｒ系
磁性粉末であるＢＳＦ‐５４７、ＢＳＦ‐４００、ＫＮ
Ｓ‐４１５や、Ｎｉ‐Ｚｎ‐Ｆｒ系磁性粉末であるＢＳ
Ｎ‐３５５Ｂ等を用いることができる。その磁性粉末
は、粒径が５μｍ以下とされ、磁性材料中に９０重量％
以上含有されるのが好ましい。Each of the coil holders 31, 32 and each of the detection rings 21, 23, which are components of the magnetic circuit, are molded from a magnetic material constituted by dispersing magnetic powder in a synthetic resin base material. ing. As the molding method,
For example, an injection molding method can be adopted. The synthetic resin material is not particularly limited, and for example, nylon can be used. The magnetic powder is not particularly limited. For example, Mn-Zn-Fr
Magnetic powder and Ni-Zn-Fr-based magnetic powder can be used, and as commercial products, BSF-547, BSF-400, KN which are Mn-Zn-Fr-based magnetic powders manufactured by Toda Kogyo Co., Ltd.
S-415 or BS which is Ni-Zn-Fr magnetic powder
N-355B or the like can be used. The magnetic powder has a particle size of 5 μm or less, and 90% by weight in the magnetic material.
It is preferable to contain the above.
【００２５】その各コイルホルダー３１、３２の周壁部
３１ａ、３２ａの外周が、そのコイルホルダー３１、３
２を構成する磁性材料よりも靱性の高い合成樹脂材から
成形される第１、第２被覆部材６１、６２により覆われ
ている。その第１コイルホルダー３１と第１被覆部材６
１とは一体化されている。また、その第２コイルホルダ
ー３２と第２被覆部材６２とは一体化されている。各コ
イルホルダー３１、３２は、各被覆部材６１、６２を介
してハウジング２に圧入されている。The outer circumferences of the peripheral wall portions 31a and 32a of the coil holders 31 and 32 correspond to the coil holders 31 and 3 respectively.
2 are covered with first and second covering members 61 and 62 formed of a synthetic resin material having higher toughness than the magnetic material constituting the second material. The first coil holder 31 and the first covering member 6
1 is integrated. Further, the second coil holder 32 and the second covering member 62 are integrated. Each of the coil holders 31 and 32 is press-fitted into the housing 2 via each of the covering members 61 and 62.
【００２６】各被覆部材６１、６２の材質はコイルホル
ダー３１、３２を構成する磁性材料よりも靱性が高い合
成樹脂であれば特に限定されず、例えば、ＰＰ（ポリプ
ロピレン）、ＰＢＴ（ポリテレフタル酸ブチレン）、Ｐ
ＯＭ（ポリアセタール）等を用いることができる。ま
た、各被覆部材６１、６２を構成する合成樹脂は、靱性
を可及的に高くするため、グラスファイバー等の強化材
を含まないものとするのが好ましい。The material of the covering members 61 and 62 is not particularly limited as long as it is a synthetic resin having higher toughness than the magnetic material constituting the coil holders 31 and 32. For example, PP (polypropylene), PBT (polybutylene terephthalate) ), P
OM (polyacetal) or the like can be used. It is preferable that the synthetic resin forming each of the covering members 61 and 62 does not include a reinforcing material such as glass fiber in order to increase toughness as much as possible.
【００２７】各被覆部材６１、６２の成形法として、例
えば射出成形法を採用できる。また、第１コイルホルダ
ー３１の周壁部３１ａと側壁部３１ｂと第１被覆部材６
１とを、同一の成形型内で成形することで一体化しても
よいし、型成形された周壁部３１ａと側壁部３１ｂとを
挿入した別の型内で第１被覆部材６１を成形することで
一体化してもよい。同様に、第２コイルホルダー３２の
周壁部３２ａと側壁部３２ｂと第２被覆部材６２とを、
同一の成形型内で成形することで一体化してもよいし、
型成形された周壁部３２ａと側壁部３２ｂとを挿入した
別の型内で第２被覆部材６２を成形することで一体化し
てもよい。なお、コイルホルダー３１、３２における検
出コイル３３、３４の発生磁束の通過が阻害されなけれ
ば、被覆部材６１、６２によるコイルホルダー３１、３
２の被覆箇所は特に制限されない。As a molding method of the covering members 61 and 62, for example, an injection molding method can be adopted. Further, the peripheral wall portion 31a and the side wall portion 31b of the first coil holder 31 and the first covering member 6
1 may be integrated by molding in the same molding die, or the first covering member 61 may be molded in another die in which the molded peripheral wall portion 31a and the side wall portion 31b are inserted. May be integrated. Similarly, the peripheral wall portion 32a, the side wall portion 32b, and the second covering member 62 of the second coil holder 32 are
It may be integrated by molding in the same mold,
The second covering member 62 may be integrated in another mold in which the molded peripheral wall portion 32a and the side wall portion 32b are inserted. If the passage of the magnetic flux generated by the detection coils 33 and 34 in the coil holders 31 and 32 is not hindered, the coil holders 31 and 3
No. 2 is not particularly limited.
【００２８】図４、図５の（１）、（２）、（３）、図
６に示すように、各被覆部材６１、６２は、環状の支持
壁６１ａ、６２ａと、この支持壁６１ａ、６２ａの外周
により片持ち状に支持される３つの被覆壁６１ｂ、６２
ｂとを有する。As shown in FIGS. 4 and 5, (1), (2), (3), and FIG. 6, each of the covering members 61, 62 has an annular supporting wall 61a, 62a, and the supporting wall 61a, Three covering walls 61b, 62 supported in a cantilever manner by the outer periphery of 62a
b.
【００２９】第１被覆部材６１の支持壁６１ａは、第１
コイルホルダー３１の側壁部３１ｂの外端面に一体化さ
れる。第１被覆部材６１の各被覆壁６１ｂは、互いに周
方向に等間隔をおいた３位置において、その支持壁６１
ａから入出力シャフト３、４の軸方向に沿って延び、第
１コイルホルダー３１の周壁部３１ａの外周面に一体化
され、第２コイルホルダー３２の周壁部３２ａの外周面
に接する。また、各被覆壁６１ｂは環状の支持壁６１ａ
の外周と同心の円に沿うように湾曲し、それぞれの周方
向寸法は円周の１／６とされている。The support wall 61a of the first covering member 61 is
It is integrated with the outer end surface of the side wall 31b of the coil holder 31. Each of the coating walls 61b of the first coating member 61 has its support wall 61 at three positions at equal intervals in the circumferential direction.
a extends in the axial direction of the input / output shafts 3 and 4, is integrated with the outer peripheral surface of the peripheral wall portion 31 a of the first coil holder 31, and contacts the outer peripheral surface of the peripheral wall portion 32 a of the second coil holder 32. Further, each covering wall 61b is formed as an annular supporting wall 61a.
Are curved so as to follow a circle concentric with the outer periphery of each of them, and each circumferential dimension is 1/6 of the circumference.
【００３０】第２被覆部材６２の支持壁６２ａは第２コ
イルホルダー３２の側壁部３２ｂの外端面に一体化され
る。第２被覆部材６２の各被覆壁６２ｂは、互いに周方
向に等間隔をおいた３位置において、その支持壁６２ａ
から入出力シャフト３、４の軸方向に沿って延び、第２
コイルホルダー３２の周壁部３２ａの外周面に一体化さ
れ、第１コイルホルダー３１の周壁部３１ａの外周面に
接する。また、その被覆壁６２ｂは環状の支持壁６２ａ
の外周と同心の円に沿うように湾曲し、それぞれの周方
向寸法は円周の１／６とされている。The support wall 62a of the second covering member 62 is integrated with the outer end surface of the side wall 32b of the second coil holder 32. Each of the covering walls 62b of the second covering member 62 has its support wall 62a at three positions equally spaced in the circumferential direction.
Extends along the axial direction of the input / output shafts 3 and 4 from the second
It is integrated with the outer peripheral surface of the peripheral wall portion 32a of the coil holder 32 and contacts the outer peripheral surface of the peripheral wall portion 31a of the first coil holder 31. The covering wall 62b is formed as an annular support wall 62a.
Are curved so as to follow a circle concentric with the outer periphery of each of them, and each circumferential dimension is 1/6 of the circumference.
【００３１】組立工程においては、その第１被覆部材６
１に一体化された第１コイルホルダー３１の周壁部３１
ａ内に、第１検出コイル３３が挿入され、次に蓋体３１
ｃが挿入される。また、その第２被覆部材６２に一体化
された第２コイルホルダー３２の周壁部３２ａ内に、第
２検出コイル３４が挿入され、次に蓋体３２ｃが挿入さ
れる。次に、上記スペーサ５１が第１コイルホルダー３
１と第２コイルホルダー３２との間に配置され、両被覆
部材６１、６２を互いに入出力シャフト３、４の軸方向
に沿って近接させることで、第１被覆部材６１の被覆壁
６１ｂの間に第２被覆部材６２の被覆壁６２ｂが配置さ
れる。しかる後に、図７の（１）、（２）に示す絶縁材
製の弾性変形可能な円弧形の止め具６３により、図４、
図８に示すように、両被覆壁６１ｂ、６２ｂの外周が覆
われる。その止め具６３は両被覆壁６１ｂ、６２ｂの後
述の凸部６１ｂ′、６２ｂ′の間に配置され、両被覆部
材６１、６２およびコイルホルダー３１、３２が分離す
るのを阻止する。In the assembling process, the first covering member 6
Peripheral wall 31 of first coil holder 31 integrated into 1
a, the first detection coil 33 is inserted into the
c is inserted. Further, the second detection coil 34 is inserted into the peripheral wall portion 32a of the second coil holder 32 integrated with the second covering member 62, and then the lid 32c is inserted. Next, the spacer 51 is attached to the first coil holder 3.
The first and second coil holders 32 are arranged between the first and second coil holders 32, and by bringing the two covering members 61 and 62 close to each other along the axial direction of the input / output shafts 3 and 4, the space between the covering walls 61 b of the first covering member 61 is reduced. The coating wall 62b of the second coating member 62 is disposed at the second position. After that, the elastically deformable arc-shaped stopper 63 made of an insulating material shown in FIGS.
As shown in FIG. 8, the outer peripheries of both the covering walls 61b and 62b are covered. The stopper 63 is disposed between convex portions 61b 'and 62b' of the covering walls 61b and 62b, which will be described later, and prevents the covering members 61 and 62 and the coil holders 31 and 32 from separating.
【００３２】各被覆壁６１ｂ、６２ｂの先端側の外周
に、周方向に沿う弾性変形可能な凸部６１ｂ′、６２
ｂ′が一体的に形成されている。本実施形態では、その
凸部６１ｂ′、６２ｂ′を介して被覆部材６１、６２は
ハウジング２に圧入される。また、各被覆壁６１ｂ、６
２ｂに配線４２、４３の通過用切欠６１ｂ″、６２ｂ″
が形成される。The protrusions 61b ', 62 which are elastically deformable along the circumferential direction are provided on the outer periphery of the distal end side of each coating wall 61b, 62b.
b 'is formed integrally. In the present embodiment, the covering members 61 and 62 are press-fitted into the housing 2 via the convex portions 61b 'and 62b'. In addition, each covering wall 61b, 6
2b, the cutouts 61b ″ and 62b ″ for the passage of the wirings 42 and 43
Is formed.
【００３３】図９の（１）、（２）に示すように、上記
各検出リング２１、２３の内周に、各検出リング２１、
２３を構成する磁性材料よりも靱性の高い合成樹脂材か
ら成形される被覆部材６４、６５が一体化されている。
各被覆部材６４、６５の材質は検出リング２１、２３を
構成する磁性材料よりも靱性が高ければ特に限定され
ず、例えば、ＰＰ、ＰＢＴ、ＰＯＭ等を用いることがで
きる。また、各被覆部材６１、６２を構成する合成樹脂
は、靱性を可及的に高くするため、グラスファイバー等
の強化材を含まないものとするのが好ましい。また、各
被覆部材６４、６５の厚さは、寸法精度に影響を与えな
いように、２ｍｍ程度とするのが好ましい。各被覆部材
６４、６５の成形法として、例えば射出成形法を採用で
きる。また、各検出リング２１、２３と各被覆部材６
４、６５とを、同一の成形型内で成形することで一体化
してもよいし、検出リング２１、２３を型成形した後
に、その検出リング２１、２３を挿入した別の型内で被
覆部材６４、６５を成形することで一体化してもよい。
なお、検出リング２１、２３における検出コイル３３、
３４の発生磁束の通過が阻害されなければ、その被覆部
材６４、６５による検出リング２１、２３の被覆箇所は
特に制限されないが、上記のように少なくとも検出リン
グ２１、２３の内周を被覆することで、入出力シャフト
３、４（トルク伝達シャフト）の外周に円滑に嵌め合わ
せることができ、圧入時に検出リング２１、２３が破損
するのを防止できる。As shown in FIGS. 9 (1) and 9 (2), each detection ring 21
Coating members 64 and 65 formed from a synthetic resin material having a higher toughness than the magnetic material constituting 23 are integrated.
The material of each of the coating members 64 and 65 is not particularly limited as long as it is higher in toughness than the magnetic material forming the detection rings 21 and 23, and for example, PP, PBT, POM, or the like can be used. It is preferable that the synthetic resin forming each of the covering members 61 and 62 does not include a reinforcing material such as glass fiber in order to increase toughness as much as possible. The thickness of each of the covering members 64 and 65 is preferably about 2 mm so as not to affect the dimensional accuracy. As a molding method of each of the covering members 64 and 65, for example, an injection molding method can be adopted. In addition, each detection ring 21 and 23 and each covering member 6
4 and 65 may be integrated by molding in the same molding die, or after forming the detection rings 21 and 23, the covering member may be inserted in another mold into which the detection rings 21 and 23 are inserted. 64 and 65 may be integrated by molding.
In addition, the detection coils 33 in the detection rings 21 and 23,
As long as the passage of the generated magnetic flux of 34 is not hindered, the covering portions of the detecting rings 21 and 23 by the covering members 64 and 65 are not particularly limited, but at least the inner periphery of the detecting rings 21 and 23 should be covered as described above. Thus, the input and output shafts 3 and 4 (torque transmission shafts) can be smoothly fitted to the outer periphery, and the detection rings 21 and 23 can be prevented from being damaged during press fitting.
【００３４】図１０の（１）、（２）に示すように、上
記環状スペーサ５１の外周３位置に、上記配線４２、４
３を通すための凹部５１ａが形成され、各凹部５１ａの
間の両側部に重量軽減のための盗み部５１ｂが形成され
ている。このスペーサ５１の材質として絶縁性材料を用
いることで、渦電流の発生を防止してトルク検出精度の
低下を防止できる。その絶縁性材料としてＰＰＳ（ポリ
フェニレンスルフィド）等の合成樹脂材に、収縮や反り
等による寸法精度低下防止と線膨張係数低減とを目的と
してグラスファイバー、マイカ、タルク、ＣａＣＯ3 等
の無機フィラーを充填したものを用い、加工コスト低減
のために射出成形により成形するのが好ましい。例え
ば、ＰＰＳを基材として、グラスファイバーを２５〜３
５重量％、無機フィラーを２５〜３５重量％含む絶縁性
材料を用いるのが好ましい。As shown in FIGS. 10A and 10B, the wirings 42, 4
3 are formed, and steal portions 51b for reducing weight are formed on both sides between the recesses 51a. By using an insulating material as the material of the spacer 51, it is possible to prevent the occurrence of eddy current and prevent the torque detection accuracy from lowering. As an insulating material, a synthetic resin material such as PPS (polyphenylene sulfide) is filled with an inorganic filler such as glass fiber, mica, talc, and CaCO 3 for the purpose of preventing a reduction in dimensional accuracy due to shrinkage or warpage and reducing a linear expansion coefficient. It is preferable to use a molded product and mold it by injection molding in order to reduce the processing cost. For example, using PPS as a base material, glass fibers of 25 to 3
It is preferable to use an insulating material containing 5% by weight and 25 to 35% by weight of an inorganic filler.
【００３５】上記構成によれば、トルク検出用磁気回路
の構成部材であるコイルホルダー３１、３２と検出リン
グ２１、２３を磁性材料から型成形するので、その構成
部材に機械加工による外力や残留応力が作用することは
ない。これにより、その磁気回路の磁気特性を安定化さ
せ、トルクの検出精度を向上できる。また、機械加工を
なくして加工コストを低減できる。また、その構成部材
を構成する磁性材料の脆さを、被覆部材６１、６２、６
４、６５を構成する合成樹脂材の靱性により補うことが
できる。また、そのコイルホルダー３１、３２をハウジ
ング２に圧入する際に作用する力を被覆部材６１、６２
により受けることができるので、コイルホルダー３１、
３２に作用する荷重の変動が小さくなる。また、検出リ
ング２１、２３を入出力シャフト３、４に圧入する際に
作用する力を被覆部材６４、６５により受けることがで
きるので、検出リング２１、２３に作用する荷重の変動
が小さくなる。これにより、コイルホルダー３１、３２
および検出リング２１、２３を含む磁気回路における磁
気特性の変動が小さくなるのでトルク検出精度が低下す
るのを防止できる。さらに、被覆部材６１、６２を弾性
変形可能な凸部６１ｂ′、６２ｂ′を介してハウジング
２の内周により支持することで、コイルホルダー３１、
３２の外周とハウジング２の内周との間に高精度のクリ
アランスを設定することなく、温度変動による熱変形に
よりコイルホルダー３１、３２がハウジング２に押し付
けられて大きな力を受けるのを防止できる。これによ
り、コイルホルダー３１、３２を高精度に加工する必要
がなく、加工コストを低減でき、組み付け性を向上でき
る。According to the above configuration, since the coil holders 31, 32 and the detection rings 21, 23, which are members of the magnetic circuit for torque detection, are molded from a magnetic material, external forces and residual stress due to machining are applied to the members. Does not work. Thereby, the magnetic characteristics of the magnetic circuit can be stabilized, and the accuracy of torque detection can be improved. In addition, machining costs can be reduced by eliminating machining. Further, the brittleness of the magnetic material constituting the constituent member is reduced by the covering members 61, 62, 6.
4, 65 can be compensated for by the toughness of the synthetic resin material. Further, the force acting when the coil holders 31 and 32 are pressed into the housing 2 is applied to the covering members 61 and 62.
Can be received by the coil holder 31,
The fluctuation of the load acting on the P. 32 is reduced. Further, since the forces acting upon press-fitting the detection rings 21 and 23 into the input / output shafts 3 and 4 can be received by the covering members 64 and 65, fluctuations in the load acting on the detection rings 21 and 23 are reduced. Thereby, the coil holders 31, 32
Further, since the fluctuation of the magnetic characteristics in the magnetic circuit including the detection rings 21 and 23 is reduced, it is possible to prevent the torque detection accuracy from being lowered. Further, by supporting the covering members 61 and 62 by the inner periphery of the housing 2 via the elastically deformable convex portions 61b 'and 62b', the coil holder 31,
It is possible to prevent the coil holders 31 and 32 from being pressed against the housing 2 due to thermal deformation due to temperature fluctuation and receiving a large force without setting a highly accurate clearance between the outer circumference of the housing 32 and the inner circumference of the housing 2. Thus, it is not necessary to process the coil holders 31 and 32 with high accuracy, the processing cost can be reduced, and the assemblability can be improved.
【００３６】本発明は上記実施形態に限定されない。例
えば、下記のような変形例を採用できる。The present invention is not limited to the above embodiment. For example, the following modifications can be adopted.
【００３７】（第１変形例）図１１の（１）、（２）を
参照して本発明の第１変形例を説明する。なお、上記実
施形態と同一部分は同一符号で示す。この第１変形例
は、上記実施形態の第１、第２コイルホルダー３１、３
２および第１、第２被覆部材６１、６２とは異なる第
１、第２コイルホルダー１３１、１３２と被覆部材１６
１を有する。(First Modification) A first modification of the present invention will be described with reference to (1) and (2) of FIG. The same parts as those in the above embodiment are denoted by the same reference numerals. This first modified example is a modification of the first and second coil holders 31 and 3 of the above embodiment.
2 and first and second coil holders 131 and 132 different from the first and second coating members 61 and 62, and the coating member 16
One.
【００３８】各コイルホルダー１３１、１３２は、２部
材１３１′、１３１″、１３２′、１３２″を接合する
ことで構成される。各コイルホルダー１３１、１３２に
おいて、一方の部材１３１′、１３２′は、検出コイル
３３、３４の外周を覆う円筒形の周壁部１３１ａ、１３
２ａと、この周壁部１３１ａ、１３２ａに一体的に形成
されると共に検出コイル３３、３４の一端側を覆う環状
の側壁部１３１ｂ、１３２ｂとを有する。各コイルホル
ダー１３１、１３２において、他方の部材１３１″、１
３２″は、検出コイル３３、３４の外周を覆う円筒形の
周壁部１３１ｃ、１３２ｃと、この周壁部１３１ｃ、１
３２ｃに一体的に形成されると共に検出コイル３３、３
４の他端側を覆う環状の側壁部１３１ｄ、１３２ｄとを
有する。なお、各コイルホルダー１３１、１３２におい
て、他方の部材１３１″、１３２″の側壁部１３１ｄ、
１３２ｄには配線４２、４３の通過用切欠１３１ｄ′、
１３２ｄ′が形成される。各コイルホルダー１３１、１
３２の材質は上記実施形態と同様とされる。その被覆部
材１６１と各コイルホルダー１３１、１３２は個別に成
形される。Each of the coil holders 131, 132 is constituted by joining two members 131 ', 131 ", 132', 132". In each of the coil holders 131 and 132, one of the members 131 'and 132' has a cylindrical peripheral wall 131a and 13 which covers the outer periphery of the detection coils 33 and 34.
2a and annular side walls 131b, 132b formed integrally with the peripheral walls 131a, 132a and covering one end of the detection coils 33, 34. In each of the coil holders 131 and 132, the other member 131 ″, 1
32 ″ is a cylindrical peripheral wall portion 131c, 132c that covers the outer periphery of the detection coils 33, 34, and the peripheral wall portions 131c, 132c.
32c and the detection coils 33, 3
4 having annular side walls 131d and 132d covering the other end. In each of the coil holders 131 and 132, the side walls 131d of the other members 131 ″ and 132 ″,
132d has notches 131d 'for passage of the wires 42 and 43;
132d 'is formed. Each coil holder 131, 1
The material of 32 is the same as in the above embodiment. The covering member 161 and the coil holders 131 and 132 are individually formed.
【００３９】その被覆部材１６１は、環状の支持壁１６
１ａと、この支持壁１６１ａの外周により片持ち状に支
持される４つの被覆壁１６１ｂと、環状の蓋部材１６１
ｃとを有する。その被覆壁１６１ｂ内に、第１検出コイ
ル３３を保持する第１コイルホルダー１３１とスペーサ
５１と第２検出コイル３４を保持する第２コイルホルダ
ー１３２が挿入される。その支持壁１６１ａは、第１コ
イルホルダー１３１の側壁部１３１ｂの外端面に接す
る。各被覆壁１６１ｂは、互いに周方向に等間隔をおい
た４位置において、その支持壁１６１ａから入出力シャ
フト３、４の軸方向に沿って延び、両コイルホルダー１
３１、１３２の周壁部１３１ａ、１３２ａの外周面に接
する。また、各被覆壁１６１ｂは環状の支持壁１６１ａ
の外周と同心の円に沿うように湾曲する。その蓋部材１
６１ｃの外周に形成された突部１６１ｃ′が、各被覆壁
１６１ｂの他端内周に形成された凹溝１６１ｂ″に嵌め
合わされる。これにより、その蓋部材１６１ｃは第２コ
イルホルダー１３２の側壁部１３２ｂの外端面に接す
る。その被覆部材１６１の材質は上記実施形態と同様と
される。The covering member 161 is provided with an annular support wall 16.
1a, four covering walls 161b supported in a cantilever manner by the outer periphery of the supporting wall 161a, and an annular lid member 161.
c. The first coil holder 131 holding the first detection coil 33, the second coil holder 132 holding the spacer 51 and the second detection coil 34 are inserted into the covering wall 161b. The support wall 161a contacts the outer end surface of the side wall 131b of the first coil holder 131. Each covering wall 161b extends from the supporting wall 161a in the axial direction of the input / output shafts 3 and 4 at four positions equally spaced in the circumferential direction from each other.
31 and 132 are in contact with the outer peripheral surfaces of the peripheral wall portions 131a and 132a. In addition, each covering wall 161b has an annular supporting wall 161a.
Curved along a circle that is concentric with the outer circumference of. The lid member 1
The protrusion 161c 'formed on the outer circumference of the outer wall 61c is fitted into the concave groove 161b "formed on the inner circumference of the other end of each covering wall 161b. The covering member 161 is in contact with the outer end surface of the portion 132b, and the material of the covering member 161 is the same as that of the above-described embodiment.
【００４０】各被覆壁１６１ｂの外周に、周方向に沿う
弾性変形可能な凸部１６１ｂ′が一体的に形成されてい
る。その凸部１６１ｂ′を介して被覆部材１６１はハウ
ジング２に圧入される。他は上記実施形態と同様とされ
ている。An elastically deformable convex portion 161b 'along the circumferential direction is integrally formed on the outer periphery of each covering wall 161b. The covering member 161 is press-fitted into the housing 2 via the projection 161b '. Others are the same as the above embodiment.
【００４１】（第２変形例）図１２の（１）、（２）を
参照して本発明の第２変形例を説明する。なお、上記実
施形態と同一部分は同一符号で示す。この第２変形例
は、上記実施形態の第１、第２被覆部材６１、６２およ
びスペーサ５１とは異なる被覆部材２６１とスペーサ２
５１を有する。(Second Modification) A second modification of the present invention will be described with reference to (1) and (2) of FIG. The same parts as those in the above embodiment are denoted by the same reference numerals. The second modified example is different from the first and second covering members 61 and 62 and the spacer 51 of the above-described embodiment in that the covering member 261 and the spacer 2 are different from each other.
51.
【００４２】その被覆部材２６１は、弾性変形可能な円
弧形状の被覆壁２６１ｂと、この被覆壁２６１ｂの内周
の両側に形成される嵌合部２６１ｃ、２６１ｄとを有す
る。その被覆壁２６１ｂの内周面は、両コイルホルダー
３１、３２の周壁部３１ａ、３２ａの外周面に接する。
一方の嵌合部２６１ｃは、第１コイルホルダー３１の外
周に形成された溝３１′に嵌め合わされる。他方の嵌合
部２６１ｄは、第２コイルホルダー３２の外周に形成さ
れた溝３２′に嵌め合わされる。そのスペーサ２５１は
弾性変形可能な円弧形状を有し、その被覆部材２６１の
内周に一体化されている。その被覆部材２６１の材質は
上記実施形態と同様とされる。そのスペーサ２５１は被
覆部材２６１と同一材質とされる。その被覆部材２６１
と各コイルホルダー３１、３２は個別に成形される。そ
の被覆部材２６１とスペーサ２５１は一体的に成形され
る。The covering member 261 has an arc-shaped covering wall 261b that can be elastically deformed, and fitting portions 261c and 261d formed on both sides of the inner periphery of the covering wall 261b. The inner peripheral surface of the covering wall 261b is in contact with the outer peripheral surfaces of the peripheral wall portions 31a and 32a of the coil holders 31 and 32.
One fitting portion 261c is fitted into a groove 31 'formed on the outer periphery of the first coil holder 31. The other fitting portion 261d is fitted into a groove 32 'formed on the outer periphery of the second coil holder 32. The spacer 251 has an arc shape that can be elastically deformed, and is integrated with the inner periphery of the covering member 261. The material of the covering member 261 is the same as in the above embodiment. The spacer 251 is made of the same material as the covering member 261. The covering member 261
And the coil holders 31 and 32 are individually molded. The covering member 261 and the spacer 251 are integrally formed.
【００４３】被覆壁２６１ｂの外周に、周方向に沿う弾
性変形可能な凸部２６１ｂ′が一体的に形成されてい
る。その凸部２６１ｂ′を介して被覆部材２６１はハウ
ジング２に圧入される。他は上記実施形態と同様とされ
ている。An elastically deformable convex portion 261b 'along the circumferential direction is integrally formed on the outer periphery of the covering wall 261b. The covering member 261 is press-fitted into the housing 2 via the projection 261b '. Others are the same as the above embodiment.
【００４４】（第３変形例）図１３、図１４、図１５の
（１）、（２）、（３）を参照して本発明の第３変形例
を説明する。なお、上記実施形態と同一部分は同一符号
で示す。この第３変形例は、上記実施形態の第１、第２
被覆部材６１、６２およびスペーサ５１とは異なる被覆
部材３６１とスペーサ３５１を有する。(Third Modification) A third modification of the present invention will be described with reference to FIGS. 13, 14, and 15 (1), (2), and (3). The same parts as those in the above embodiment are denoted by the same reference numerals. This third modification is the first and second embodiments of the above-described embodiment.
A covering member 361 and a spacer 351 different from the covering members 61 and 62 and the spacer 51 are provided.
【００４５】その被覆部材３６１は、環状の第１支持壁
３６１ａと、筒状の被覆壁３６１ｂと、環状の第２支持
壁３６１ｃとを有し、被覆壁３６１ｂの両端内周に支持
壁３６１ａ、３６１ｃが一体化されている。その被覆壁
３６１ｂ内に、第１検出コイル３３を保持する第１コイ
ルホルダー３１と第２検出コイル３４を保持する第２コ
イルホルダー３２が挿入される。第１支持壁３６１ａ
は、第１コイルホルダー３１の側壁部３１ｂの外端面に
接する。被覆壁３６１ｂは、両コイルホルダー３１、３
２の周壁部３１ａ、３２ａの外周面に接する。第２支持
壁３６１ｃは第２コイルホルダー３２の側壁部３２ｂの
外端面に接する。その被覆部材３６１の材質は上記実施
形態と同様とされる。その被覆部材３６１と各コイルホ
ルダー３１、３２は個別に成形される。そのスペーサ３
５１は円板形状で、その被覆部材３６１の内周に一体化
されている。そのスペーサ３５１は被覆部材３６１と同
一材質とされる。その被覆部材３６１とスペーサ３５１
とに配線４２、４３の通過用切欠３０１が形成される。The covering member 361 has a first annular supporting wall 361a, a cylindrical covering wall 361b, and a second annular supporting wall 361c. 361c are integrated. The first coil holder 31 holding the first detection coil 33 and the second coil holder 32 holding the second detection coil 34 are inserted into the covering wall 361b. First support wall 361a
Is in contact with the outer end surface of the side wall 31b of the first coil holder 31. The covering wall 361b is connected to both coil holders 31, 3
The outer peripheral surfaces of the second peripheral wall portions 31a and 32a are in contact with each other. The second support wall 361c contacts the outer end surface of the side wall 32b of the second coil holder 32. The material of the covering member 361 is the same as in the above embodiment. The covering member 361 and the coil holders 31 and 32 are individually formed. The spacer 3
Reference numeral 51 denotes a disk shape, which is integrated with the inner periphery of the covering member 361. The spacer 351 is made of the same material as the covering member 361. The covering member 361 and the spacer 351
At this time, a notch 301 for passing the wirings 42 and 43 is formed.
【００４６】その被覆部材３６１とスペーサ３５１は、
入出力シャフトの軸心を含む平面において、ヒンジ３０
２を構成する部分を除いて２部分に分割されている。こ
れにより、その被覆部材３６１とスペーサ３５１は開閉
可能とされ、その開状態で被覆部材３６１内に検出コイ
ル３３、３４を保持するコイルホルダー３１、３２が抜
き挿しされる。その被覆部材３６１とスペーサ３５１の
閉状態を維持できるように、その分割された２部分の一
方にフック３０３が一体形成され、他方にそのフック３
０３が取り外し可能に噛み合う受け部３０４が一体形成
されている。他は上記実施形態と同様とされている。The covering member 361 and the spacer 351 are
In a plane including the axis of the input / output shaft, the hinge 30
It is divided into two parts except for the part constituting 2. Thereby, the covering member 361 and the spacer 351 can be opened and closed, and the coil holders 31 and 32 holding the detection coils 33 and 34 are pulled out and inserted into the covering member 361 in the open state. In order to maintain the closed state of the covering member 361 and the spacer 351, a hook 303 is integrally formed on one of the divided two portions, and the hook 303 is formed on the other.
The receiving part 304 with which the 03 is detachably engaged is integrally formed. Others are the same as the above embodiment.
【００４７】（第４変形例）図１６〜図１９を参照して
本発明の第４変形例を説明する。なお、上記実施形態と
同一部分は同一符号で示す。この第４変形例は、上記実
施形態の第１、第２被覆部材６１、６２および第１、第
２検出コイル３３、３４とは異なる第１、第２被覆部材
４６１、４６２および第１、第２検出コイル４３３、４
３４を有する。(Fourth Modification) A fourth modification of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals. The fourth modified example is different from the first and second covering members 61 and 62 and the first and second detection coils 33 and 34 of the above-described embodiment in the first and second covering members 461 and 462 and the first and second covering members. 2 detection coils 433, 4
34.
【００４８】すなわち、その第１被覆部材４６１は、第
１コイルホルダー３１の側壁部３１ｂの両端面と内周面
を覆う側壁被覆部４６１ａと、蓋体３１ｃの両端面と内
周面を覆う蓋体被覆部４６１ｂと、その蓋体被覆部４６
１ｂから側壁被覆部４６１ａに向かい延びる巻き付け部
４６１ｃとを有する。その側壁部３１ｂと側壁被覆部４
６１ａとは一体化され、その蓋体３１ｃと蓋体被覆部４
６１ｂと巻き付け部４６１ｃとは一体化されている。That is, the first covering member 461 includes a side wall covering portion 461a that covers both end surfaces and the inner peripheral surface of the side wall portion 31b of the first coil holder 31, and a lid that covers both end surfaces and the inner peripheral surface of the lid 31c. Body covering portion 461b and its lid covering portion 46
And a winding part 461c extending from the side wall 1b to the side wall covering part 461a. The side wall 31b and the side wall coating 4
61a and the lid 31c and the lid cover 4
61b and the winding part 461c are integrated.
【００４９】その第２被覆部材４６２は、第２コイルホ
ルダー３２の側壁部３２ｂの両端面と内周面を覆う側壁
被覆部４６２ａと、蓋体３２ｃの両端面と内周面を覆う
蓋体被覆部４６２ｂと、その蓋体被覆部４６２ｂから側
壁被覆部４６２ａに向かい延びる巻き付け部４６２ｃと
を有する。その側壁部３２ｂと側壁被覆部４６２ａとは
一体化され、その蓋体３２ｃと蓋体被覆部４６２ｂと巻
き付け部４６２ｃとは一体化されている。The second covering member 462 includes a side wall covering portion 462a that covers both end surfaces and an inner peripheral surface of the side wall portion 32b of the second coil holder 32, and a lid covering member that covers both end surfaces and the inner peripheral surface of the lid 32c. It has a part 462b and a winding part 462c extending from the lid covering part 462b toward the side wall covering part 462a. The side wall portion 32b and the side wall covering portion 462a are integrated, and the lid 32c, the lid covering portion 462b, and the winding portion 462c are integrated.
【００５０】各被覆部材４６１、４６２の材質は上記実
施形態と同様とされる。各被覆部材４６１、４６２の成
形法として、例えば射出成形法を採用できる。The materials of the covering members 461 and 462 are the same as those in the above embodiment. As a molding method of the covering members 461 and 462, for example, an injection molding method can be adopted.
【００５１】第１コイルホルダー３１の周壁部３１ａと
側壁部３１ｂと第１被覆部材４６１の側壁被覆部４６１
ａとを、同一の成形型内で成形することで一体化しても
よいし、型成形された周壁部３１ａと側壁部３１ｂを挿
入した別の型内で側壁被覆部４６１ａを成形することで
一体化してもよい。同様に、蓋体３１ｃと蓋体被覆部４
６１ｂと巻き付け部４６１ｃとを、同一の成形型内で成
形することで一体化してもよいし、型成形された蓋体３
１ｃを挿入した別の型内で蓋体被覆部４６１ｂと巻き付
け部４６１ｃとを成形することで一体化してもよい。The peripheral wall 31a and the side wall 31b of the first coil holder 31, and the side wall covering 461 of the first covering member 461
a may be integrated by molding in the same molding die, or may be integrated by molding the side wall covering portion 461a in another die in which the molded peripheral wall portion 31a and the side wall portion 31b are inserted. It may be. Similarly, the lid 31c and the lid cover 4
61b and the winding portion 461c may be integrated by molding in the same molding die, or the molded lid 3
The cover body covering portion 461b and the winding portion 461c may be integrated by molding in another mold into which 1c is inserted.
【００５２】また、第２コイルホルダー３２の周壁部３
２ａと側壁部３２ｂと第２被覆部材４６２の側壁被覆部
４６２ａとを、同一の成形型内で成形することで一体化
してもよいし、型成形された周壁部３２ａと側壁部３２
ｂを挿入した別の型内で側壁被覆部４６２ａを成形する
ことで一体化してもよい。同様に、蓋体３２ｃと蓋体被
覆部４６２ｂと巻き付け部４６２ｃとを、同一の成形型
内で成形することで一体化してもよいし、型成形された
蓋体３２ｃを挿入した別の型内で蓋体被覆部４６２ｂと
巻き付け部４６２ｃとを成形することで一体化してもよ
い。The peripheral wall 3 of the second coil holder 32
The 2a, the side wall portion 32b, and the side wall covering portion 462a of the second covering member 462 may be integrated by molding in the same molding die, or the molded peripheral wall portion 32a and the side wall portion 32 may be integrated.
Alternatively, the side wall covering portion 462a may be integrated by molding in a separate mold into which b is inserted. Similarly, the lid 32c, the lid covering portion 462b, and the winding portion 462c may be integrated by being molded in the same molding die, or may be integrated into another die into which the molded lid 32c is inserted. Alternatively, the lid covering portion 462b and the winding portion 462c may be integrated by molding.
【００５３】各コイルホルダー３１、３２はハウジング
２に直接的に圧入される。Each of the coil holders 31 and 32 is directly pressed into the housing 2.
【００５４】各巻き付け部４６１ｃ、４６２ｃに導線３
３ｂ、３４ｂが巻き付けられることで第１、第２検出コ
イル４３３、４３４が構成されている。これにより、検
出コイル４３３、４３４を構成する導線３３ｂ、３４ｂ
を巻くための専用の絶縁性部材が不要になり、部品点数
を低減し、組み付け性を向上できる。他は上記実施形態
と同様とされている。The conductor 3 is connected to each of the winding portions 461c and 462c.
The first and second detection coils 433 and 434 are configured by winding 3b and 34b. Thereby, the conducting wires 33b, 34b constituting the detection coils 433, 434
This eliminates the need for a dedicated insulating member for winding the wire, reduces the number of components, and improves the ease of assembly. Others are the same as the above embodiment.
【００５５】[0055]
【発明の効果】本発明によれば、検出精度を向上でき、
強度的に優れ、コスト、部品点数を低減し、組み付け性
を向上できるトルクセンサを提供できる。According to the present invention, the detection accuracy can be improved,
It is possible to provide a torque sensor which is excellent in strength, can reduce cost and the number of parts, and can improve assemblability.
【図１】本発明の実施形態のトルクセンサの断面図FIG. 1 is a sectional view of a torque sensor according to an embodiment of the present invention.
【図２】本発明の実施形態のトルクセンサの要部の断面
図FIG. 2 is a sectional view of a main part of the torque sensor according to the embodiment of the present invention.
【図３】本発明の実施形態のトルクセンサの回路構成の
説明図FIG. 3 is an explanatory diagram of a circuit configuration of the torque sensor according to the embodiment of the present invention.
【図４】本発明の実施形態のトルクセンサのコイルホル
ダーと被覆部材と検出コイルの組立状態での断面図FIG. 4 is a sectional view of the torque sensor according to the embodiment of the present invention in an assembled state of a coil holder, a covering member, and a detection coil.
【図５】本発明の実施形態のトルクセンサのコイルホル
ダーと被覆部材の（１）は正面図、（２）は断面図、
（３）は背面図FIG. 5 is a front view, (2) is a cross-sectional view, (1) of the coil holder and the covering member of the torque sensor according to the embodiment of the present invention.
(3) is a rear view
【図６】本発明の実施形態のトルクセンサのコイルホル
ダーと被覆部材と検出コイルの側面図FIG. 6 is a side view of a coil holder, a covering member, and a detection coil of the torque sensor according to the embodiment of the present invention.
【図７】本発明の実施形態のトルクセンサの止め具の
（１）は側面図、（２）は正面図FIG. 7 is a side view and (2) is a front view of a stopper of the torque sensor according to the embodiment of the present invention.
【図８】本発明の実施形態のトルクセンサのコイルホル
ダーと被覆部材と検出コイルの組立状態での側面図FIG. 8 is a side view of the torque sensor according to the embodiment of the present invention in a state where a coil holder, a covering member, and a detection coil are assembled.
【図９】本発明の実施形態のトルクセンサの（１）は第
１検出リングの断面図、（２）は第２検出リングの断面
図FIG. 9 is a cross-sectional view of a first detection ring of the torque sensor according to the embodiment of the present invention, and FIG.
【図１０】本発明の実施形態のトルクセンサのスペーサ
の（１）は正面図、（２）は断面図FIG. 10 is a front view of the spacer of the torque sensor according to the embodiment of the present invention, and FIG.
【図１１】本発明の第１変形例のトルクセンサのコイル
ホルダーと被覆部材と検出コイルの組立状態での（１）
は正面図、（２）は断面図FIG. 11 is an assembled state of a coil holder, a covering member, and a detection coil of a torque sensor according to a first modification of the present invention (1).
Is a front view, (2) is a sectional view
【図１２】本発明の第２変形例のトルクセンサのコイル
ホルダーと被覆部材と検出コイルの組立状態での（１）
は正面図、（２）は断面図FIG. 12 shows a torque sensor according to a second modification of the present invention in an assembled state of a coil holder, a covering member, and a detection coil (1).
Is a front view, (2) is a sectional view
【図１３】本発明の第３変形例のトルクセンサのコイル
ホルダーと被覆部材と検出コイルの組立状態での断面図FIG. 13 is a sectional view of a torque sensor according to a third modification of the present invention in an assembled state of a coil holder, a covering member, and a detection coil.
【図１４】本発明の第３変形例のトルクセンサの被覆部
材の斜視図FIG. 14 is a perspective view of a covering member of a torque sensor according to a third modification of the present invention.
【図１５】本発明の第３変形例のトルクセンサの被覆部
材の（１）は側面図、（２）は（１）の（２）矢視図、
（３）は（１）の（３）‐（３）線断面図FIG. 15 is a side view of the covering member of the torque sensor according to the third modified example of the present invention, (2) is a view (1) of FIG.
(3) is a sectional view taken along line (3)-(3) of (1).
【図１６】本発明の第４変形例のトルクセンサの要部の
断面図FIG. 16 is a sectional view of a main part of a torque sensor according to a fourth modification of the present invention.
【図１７】本発明の第４変形例のトルクセンサのコイル
ホルダーと被覆部材と検出コイルの組立状態での断面図FIG. 17 is a sectional view of a torque sensor according to a fourth modified example of the present invention in an assembled state of a coil holder, a covering member, and a detection coil.
【図１８】本発明の第４変形例のトルクセンサのコイル
ホルダーの周壁部と側壁部と被覆部材の断面図FIG. 18 is a sectional view of a peripheral wall, a side wall, and a covering member of a coil holder of a torque sensor according to a fourth modification of the present invention.
【図１９】本発明の第４変形例のトルクセンサのコイル
ホルダーの蓋体と被覆部材の断面図FIG. 19 is a sectional view of a cover and a covering member of a coil holder of a torque sensor according to a fourth modification of the present invention.
【図２０】従来のトルクセンサの断面図FIG. 20 is a sectional view of a conventional torque sensor.
【図２１】従来のトルクセンサの回路構成の説明図FIG. 21 is an explanatory diagram of a circuit configuration of a conventional torque sensor.
１ トルクセンサ ２ ハウジング ３ 入力シャフト ４ 出力シャフト ２１、２３ 検出リング ３１、３２、１３１、１３２ コイルホルダー ３１ａ、３２ａ 周壁部 ３１ｃ、３２ｃ 蓋体 ３３、３４ 検出コイル ３３ｂ、３４ｂ 導線 ６１、６２、６４、６５、１６１、２６１、３６１、４
６１、４６２ 被覆部材 ６１ｂ′、６２ｂ′ 凸部DESCRIPTION OF SYMBOLS 1 Torque sensor 2 Housing 3 Input shaft 4 Output shaft 21, 23 Detection ring 31, 32, 131, 132 Coil holder 31a, 32a Peripheral wall part 31c, 32c Lid 33, 34 Detection coil 33b, 34b Conductor 61, 62, 64, 65, 161, 261, 361, 4
61, 462 Covering member 61b ', 62b' Convex part
Claims (6)
きトルクを検出可能なトルクセンサにおいて、 その磁気回路の構成部材の少なくとも一つが、合成樹脂
製の基材中に磁性粉末を分散させることで構成される磁
性材料から型成形されていることを特徴とするトルクセ
ンサ。1. A torque sensor capable of detecting a torque based on a change in magnetic resistance in a magnetic circuit, wherein at least one of the components of the magnetic circuit is formed by dispersing magnetic powder in a synthetic resin base material. A torque sensor characterized by being molded from a magnetic material to be formed.
の構成部材の少なくとも一つの少なくとも一部が、その
磁性材料よりも靱性の高い合成樹脂材から成形される被
覆部材により被覆されている請求項１に記載のトルクセ
ンサ。2. The magnetic circuit according to claim 1, wherein at least a part of at least one component of a magnetic circuit molded from the magnetic material is covered with a covering member molded from a synthetic resin material having higher toughness than the magnetic material. Item 2. The torque sensor according to item 1.
の構成部材として、ハウジングに挿入されるコイルホル
ダーを備え、 そのコイルホルダーの外周の少なくとも一部が、その磁
性材料よりも靱性の高い合成樹脂材から成形される被覆
部材により被覆され、 そのコイルホルダーは、その被覆部材を介してハウジン
グに圧入されている請求項１に記載のトルクセンサ。3. A composite circuit comprising a coil holder inserted into a housing as a component of a magnetic circuit molded from the magnetic material, wherein at least a part of the outer periphery of the coil holder has higher toughness than the magnetic material. The torque sensor according to claim 1, wherein the coil sensor is covered with a covering member formed of a resin material, and the coil holder is press-fitted into the housing via the covering member.
体的に形成される弾性変形可能な凸部を介して、その被
覆部材はハウジングに圧入される請求項３に記載のトル
クセンサ。4. The torque sensor according to claim 3, wherein the covering member is press-fitted into the housing via an elastically deformable convex portion formed integrally with the covering member covering the coil holder.
の構成部材として、ハウジングに挿入されるコイルホル
ダーを備え、 そのコイルホルダーは、筒状の周壁部と、この周壁部の
内周に嵌め合わされる環状の蓋体とを有し、 その蓋体の少なくとも一部が、その磁性材料よりも靱性
の高い絶縁性の合成樹脂材から成形される被覆部材によ
り被覆され、 その被覆部材に、その磁気回路の構成部材を通過する磁
束を発生する検出コイルを構成する導線の巻き付け部が
一体化されている請求項１に記載のトルクセンサ。5. As a component of a magnetic circuit molded from the magnetic material, a coil holder inserted into a housing is provided, and the coil holder is fitted on a cylindrical peripheral wall portion and an inner periphery of the peripheral wall portion. An annular lid to be fitted, at least a part of the lid is covered by a covering member formed of an insulating synthetic resin material having a higher toughness than the magnetic material, and the covering member is 2. The torque sensor according to claim 1, wherein a winding portion of a conductive wire forming a detection coil that generates a magnetic flux passing through a component of the magnetic circuit is integrated.
の構成部材として、トルク伝達シャフトに挿入される検
出リングを備え、 その検出リングの内周の少なくとも一部が、その磁性材
料よりも靱性の高い合成樹脂材から成形される被覆部材
により被覆され、 その検出リングは、その被覆部材を介して前記トルク伝
達シャフトに圧入されている請求項１に記載のトルクセ
ンサ。6. As a component of a magnetic circuit molded from the magnetic material, a detection ring inserted into a torque transmission shaft is provided, and at least a part of the inner periphery of the detection ring is tougher than the magnetic material. 2. The torque sensor according to claim 1, wherein the detection ring is covered with a covering member formed of a synthetic resin material having a high hardness, and the detection ring is press-fitted into the torque transmission shaft via the covering member.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22754897A JP3645074B2 (en) | 1997-08-07 | 1997-08-07 | Torque sensor |
| PCT/JP1998/003283 WO1999008083A1 (en) | 1997-08-07 | 1998-07-22 | Torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22754897A JP3645074B2 (en) | 1997-08-07 | 1997-08-07 | Torque sensor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004217388A Division JP3823114B2 (en) | 2004-07-26 | 2004-07-26 | Torque sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1151789A true JPH1151789A (en) | 1999-02-26 |
| JP3645074B2 JP3645074B2 (en) | 2005-05-11 |
Family
ID=16862634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22754897A Expired - Fee Related JP3645074B2 (en) | 1997-08-07 | 1997-08-07 | Torque sensor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3645074B2 (en) |
| WO (1) | WO1999008083A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002013990A (en) * | 2000-06-30 | 2002-01-18 | Tokyo Shiyouketsu Kinzoku Kk | Magnetic core for non-contact type displacement sensor |
| US6481297B2 (en) | 2001-03-16 | 2002-11-19 | Mando Corporation | Torque sensor for automobiles |
| KR100397711B1 (en) * | 2000-04-06 | 2003-09-13 | 주식회사 만도 | Torque senser for car |
| EP1422505A1 (en) * | 2002-11-20 | 2004-05-26 | Koyo Seiko Co., Ltd. | Torque sensor and method of manufacturing the same |
| KR20050001828A (en) * | 2003-06-26 | 2005-01-07 | 주식회사 만도 | Non contacting torque sensor |
| EP1555515A2 (en) * | 2004-01-13 | 2005-07-20 | Koyo Seiko Co., Ltd. | Torque detecting apparatus |
| JP2007118927A (en) * | 2005-09-30 | 2007-05-17 | Nsk Ltd | Electric power steering device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0374812A (en) * | 1989-08-16 | 1991-03-29 | Matsushita Electric Ind Co Ltd | Ferrite magnetic material |
| JPH0348740U (en) * | 1989-09-20 | 1991-05-10 | ||
| JPH085477A (en) * | 1994-06-16 | 1996-01-12 | Unisia Jecs Corp | Magnetic distortion type torque sensor |
| JPH0875573A (en) * | 1994-09-07 | 1996-03-22 | Toyota Autom Loom Works Ltd | Holding member and magnetostrictine torque sensor using it |
-
1997
- 1997-08-07 JP JP22754897A patent/JP3645074B2/en not_active Expired - Fee Related
-
1998
- 1998-07-22 WO PCT/JP1998/003283 patent/WO1999008083A1/en active Application Filing
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100397711B1 (en) * | 2000-04-06 | 2003-09-13 | 주식회사 만도 | Torque senser for car |
| JP2002013990A (en) * | 2000-06-30 | 2002-01-18 | Tokyo Shiyouketsu Kinzoku Kk | Magnetic core for non-contact type displacement sensor |
| US6481297B2 (en) | 2001-03-16 | 2002-11-19 | Mando Corporation | Torque sensor for automobiles |
| EP1422505A1 (en) * | 2002-11-20 | 2004-05-26 | Koyo Seiko Co., Ltd. | Torque sensor and method of manufacturing the same |
| US6895828B2 (en) | 2002-11-20 | 2005-05-24 | Koyo Seiko Co., Ltd. | Torque sensor and method of manufacturing torque sensor |
| KR20050001828A (en) * | 2003-06-26 | 2005-01-07 | 주식회사 만도 | Non contacting torque sensor |
| EP1555515A2 (en) * | 2004-01-13 | 2005-07-20 | Koyo Seiko Co., Ltd. | Torque detecting apparatus |
| JP2005201690A (en) * | 2004-01-13 | 2005-07-28 | Koyo Seiko Co Ltd | Torque detector |
| EP1555515A3 (en) * | 2004-01-13 | 2010-07-07 | JTEKT Corporation | Torque detecting apparatus |
| JP4671605B2 (en) * | 2004-01-13 | 2011-04-20 | 株式会社ジェイテクト | Torque detection device |
| JP2007118927A (en) * | 2005-09-30 | 2007-05-17 | Nsk Ltd | Electric power steering device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3645074B2 (en) | 2005-05-11 |
| WO1999008083A1 (en) | 1999-02-18 |
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