JP2003114157A - Torque sensor - Google Patents
Torque sensorInfo
- Publication number
- JP2003114157A JP2003114157A JP2001310584A JP2001310584A JP2003114157A JP 2003114157 A JP2003114157 A JP 2003114157A JP 2001310584 A JP2001310584 A JP 2001310584A JP 2001310584 A JP2001310584 A JP 2001310584A JP 2003114157 A JP2003114157 A JP 2003114157A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- shaft
- torque
- torque sensor
- axis
- 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.)
- Withdrawn
Links
Landscapes
- Power Steering Mechanism (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電動パワーステアリ
ング装置等に用いて好適な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 use in an electric power steering device or the like.
【０００２】[0002]
【従来の技術】電動パワーステアリング装置等では、特
開平7-333083号公報に記載の如くのトルクセンサを備
え、トルクセンサが検出する入力トルクに応じて電動モ
ータを駆動することにより操舵力をアシストする。2. Description of the Related Art An electric power steering apparatus or the like is provided with a torque sensor as described in Japanese Patent Laid-Open No. 7-333083, and assists the steering force by driving an electric motor according to the input torque detected by the torque sensor. To do.
【０００３】ここで、トルクセンサは、入力軸と出力軸
に結合する円筒状のコアを囲む２個の検出コイルをハウ
ジングに設け、入力軸に作用するトルクによって、入力
軸と出力軸を連結しているトーションバーが弾性ねじり
変形し、入力軸と出力軸の間に回転方向の相対変位を生
ずると、この回転方向の変位をコアの軸方向の変位に変
換し、コアの軸方向の変位により検出コイルの周辺の磁
気的変化を生じさせ、ひいては検出コイルのインダクタ
ンス変化から入力トルクを検出する。Here, in the torque sensor, two detection coils surrounding a cylindrical core coupled to the input shaft and the output shaft are provided in the housing, and the input shaft and the output shaft are connected by the torque acting on the input shaft. When the torsion bar that is elastically twisted causes a relative displacement in the rotation direction between the input shaft and the output shaft, this displacement in the rotation direction is converted into the axial displacement of the core, and the axial displacement of the core causes the displacement. A magnetic change is generated around the detection coil, and the input torque is detected based on the change in the inductance of the detection coil.
【０００４】[0004]
【発明が解決しようとする課題】従来技術は、コアの軸
方向の変位からトルクを検出するものであり、コアを出
力軸の軸方向にのみ移動可能に出力軸に結合するととも
に、入力軸のスライダピンに係合するスライダ溝を備え
ることにより、入力軸と出力軸の回転方向の相対変位を
コアの軸方向の変位に変換させている。The prior art is to detect the torque from the axial displacement of the core. The core is coupled to the output shaft so as to be movable only in the axial direction of the output shaft, and By providing the slider groove that engages with the slider pin, the relative displacement in the rotational direction of the input shaft and the output shaft is converted into the axial displacement of the core.
【０００５】このため、従来技術では、温度変化によ
り、検出コイルに対してコアが軸方向に位置ずれする
と、検出コイルのインダクタンスが変化してしまい、入
力トルクの誤検出を招く虞がある。例えば、入力軸が温
度変化により軸方向に伸縮すると、検出コイルに対する
コアの軸方向位置がずれる。Therefore, in the prior art, when the core is axially displaced with respect to the detection coil due to temperature change, the inductance of the detection coil changes, which may lead to erroneous detection of input torque. For example, when the input shaft expands or contracts in the axial direction due to temperature change, the axial position of the core with respect to the detection coil shifts.
【０００６】本発明の課題は、トルクセンサにおいて、
検出トルクに対する温度変化の影響を小さくし、検出精
度を向上することにある。An object of the present invention is, in a torque sensor,
The object is to reduce the influence of temperature change on the detected torque and improve the detection accuracy.
【０００７】[0007]
【課題を解決するための手段】請求項１の発明は、入力
軸と出力軸をトーションバーで連結したトルクセンサに
おいて、入力軸と出力軸の一方に結合した検出軸を、他
方に結合した検出孔に挿入し、入力軸と出力軸の相対回
転方向で検出軸の軸直角外面と検出孔の軸直角内面を対
向するように配置し、検出軸の軸直角外面と検出孔の軸
直角内面の上記回転方向の距離の変位による磁気的変化
によりトルクを検出するようにしたものである。According to a first aspect of the present invention, in a torque sensor in which an input shaft and an output shaft are connected by a torsion bar, a detection shaft in which one of the input shaft and the output shaft is connected to the other is detected. Insert it into the hole and place it so that the outer surface of the detection shaft at right angles to the outer surface of the detection shaft and the inner surface of at right angles to the detection hole face each other in the direction of relative rotation of the input and output shafts. The torque is detected by a magnetic change due to the displacement of the distance in the rotation direction.
【０００８】請求項２の発明は、入力軸と出力軸をトー
ションバーで連結したトルクセンサにおいて、入力軸と
出力軸の一方に結合した検出軸を、他方に結合した検出
孔に挿入し、入力軸と出力軸の相対回転方向で検出軸の
軸直角外面と検出孔の軸直角内面を対向するように配置
し、検出軸の軸直角外面と検出孔の軸直角内面が対向す
る部分の側傍に検出コイルを配置し、検出軸の軸直角外
面と検出孔の軸直角内面の上記回転方向の距離の変位に
よる磁気的変化に基づく検出コイルのインダクタンス変
化を電気的に検出し、このインダクタンス変化からトル
クを検出する手段を有してなるようにしたものである。According to a second aspect of the present invention, in a torque sensor in which an input shaft and an output shaft are connected by a torsion bar, a detection shaft that is connected to one of the input shaft and the output shaft is inserted into a detection hole that is connected to the other, and input is performed. The outer surface of the detection shaft and the inner surface of the detection hole that are perpendicular to each other are arranged so as to face each other in the relative rotation direction of the shaft and the output shaft, and the side surface of the part where the outer surface of the detection shaft and the inner surface of the detection hole that are perpendicular to each other face each other. A detection coil is placed in the sensor, and the change in the inductance of the detection coil due to the magnetic change due to the displacement of the distance in the above-mentioned rotational direction between the outer surface perpendicular to the axis of the detection shaft and the inner surface perpendicular to the axis of the detection hole is electrically detected. A means for detecting the torque is provided.
【０００９】請求項３の発明は、請求項１又は２の発明
において更に、検出孔の軸直角内面が楕円をなし、検出
軸の軸直角断面において相直交する２軸によって区分さ
れる４領域の外面のうち、相対する一方の２領域の外面
が上記２軸のそれぞれを長軸と短軸とする楕円の１／４
円弧からなり、相対する他方の２領域の外面がそれらに
相隣る上記他の２領域の楕円の１／４円弧をつなぐ平面
からなるようにしたものである。According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the inner surface of the detection hole perpendicular to the axis forms an ellipse, and the four areas are divided by two axes orthogonal to each other in a cross section perpendicular to the axis of the detection axis. Of the outer surfaces, the outer surfaces of the two opposing regions are 1/4 of an ellipse whose major axis and minor axis are the two axes.
The outer surface of the other two areas facing each other is formed of a circular arc, and is a plane connecting the quarter arcs of the ellipse of the other two areas adjacent to each other.
【００１０】[0010]
【作用】入力軸と出力軸の一方に結合した検出軸の軸直
角外面と、他方に結合した検出孔の軸直角内面の回転方
向の距離の変位に起因する磁気的変化によってトルクを
検出するものであるから、温度変化による入力軸の軸方
向の伸縮等に起因するトルクの誤検出を招く虞がない。[Function] A torque is detected by a magnetic change caused by a displacement of the distance in the rotational direction between the outer surface at right angles to the detection shaft connected to one of the input shaft and the output shaft and the inner surface at right angles to the detection hole connected to the other. Therefore, there is no risk of erroneous detection of torque due to expansion or contraction of the input shaft in the axial direction due to temperature changes.
【００１１】[0011]
【発明の実施の形態】図１は電動パワーステアリング装
置を一部破断して示す正面図、図２は図１のII−II線に
沿う断面図、図３は図２のIII−III線に沿う断面図、図
４は図２のIV−IV線に沿う断面図、図５は検出軸を示
し、（Ａ）は断面図、（Ｂ）は底面図、図６は検出孔を
示し、（Ａ）は断面図、（Ｂ）は平面図である。1 is a partially cutaway front view of an electric power steering apparatus, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is taken along line III-III of FIG. 2 is a sectional view taken along line IV-IV of FIG. 2, FIG. 5 shows a detection axis, (A) is a sectional view, (B) is a bottom view, and FIG. 6 shows detection holes. A) is a sectional view and (B) is a plan view.
【００１２】電動パワーステアリング装置１０は、図１
〜図３に示す如く、ハウジング１１を有している。そし
て、ステアリングホイールが結合される入力軸１２にト
ーションバー１３を介して出力軸１４を連結し、この出
力軸１４にピニオン１５を設け、このピニオン１５に噛
合うラックを備えたラック軸１６をハウジング１１に左
右動可能に支持している。入力軸１２と出力軸１４の間
には、操舵トルクセンサ２０を設けてある。操舵トルク
センサ２０は、ステアリングホイールに加えた操舵トル
クが入力軸１２に付与され、トーションバー１３の弾性
ねじり変形により、入力軸１２と出力軸１４の間に生ず
る相対回転変位に基づき、操舵トルクを検出する。尚、
入力軸１２と出力軸１４は軸受１７Ａ、１７Ｂを介して
ハウジング１１に支持される。The electric power steering apparatus 10 is shown in FIG.
As shown in FIG. 3, it has a housing 11. Then, an output shaft 14 is connected to an input shaft 12 to which a steering wheel is coupled via a torsion bar 13, a pinion 15 is provided on the output shaft 14, and a rack shaft 16 provided with a rack that meshes with the pinion 15 is a housing. It is supported by 11 so that it can be moved left and right. A steering torque sensor 20 is provided between the input shaft 12 and the output shaft 14. The steering torque sensor 20 applies the steering torque applied to the steering wheel to the input shaft 12, and based on the relative rotational displacement generated between the input shaft 12 and the output shaft 14 due to the elastic torsional deformation of the torsion bar 13, the steering torque sensor 20 outputs the steering torque. To detect. still,
The input shaft 12 and the output shaft 14 are supported by the housing 11 via bearings 17A and 17B.
【００１３】電動パワーステアリング装置１０は、ラッ
ク軸１６の両端部をハウジング１１の左右に突出し、そ
れらの端部にはタイロッド１８Ａ、１８Ｂが連結し、ラ
ック軸１６の左右動によりタイロッド１８Ａ、１８Ｂを
介して左右の車輪を転舵可能とする。尚、ラック軸１６
の一端はピニオン１５との噛合い部でラックガイド（不
図示）を介し、他端は軸受（不図示）を介してそれぞれ
ハウジング１１に支持される。In the electric power steering apparatus 10, both ends of the rack shaft 16 are projected to the left and right of the housing 11, and tie rods 18A and 18B are connected to those ends, and the tie rods 18A and 18B are moved by the left and right movements of the rack shaft 16. The left and right wheels can be steered via the vehicle. The rack shaft 16
One end of the above is supported by the housing 11 through a rack guide (not shown) at a meshing portion with the pinion 15, and the other end is supported through a bearing (not shown).
【００１４】電動パワーステアリング装置１０は、ハウ
ジング１１内で、ラック軸１６の周囲に、電動モータ３
０を配設している。電動モータ３０は、ハウジング１１
の内周に固定されるステータ（磁石）３１と、鉄芯にコ
イルが巻き回されたロータ３２と、ロータ３２の内周に
一体化されたスリーブ３３とからなる。スリーブ３３
は、ラック軸１６の外周に間隔をおいて該ラック軸１６
と同軸配置されるようにハウジング１１に回転自在に支
持されている。The electric power steering device 10 includes an electric motor 3 around a rack shaft 16 in a housing 11.
0 is set. The electric motor 30 includes the housing 11
A stator (magnet) 31 fixed to the inner circumference of the rotor, a rotor 32 in which a coil is wound around an iron core, and a sleeve 33 integrated with the inner circumference of the rotor 32. Sleeve 33
Are arranged on the outer periphery of the rack shaft 16 at intervals.
It is rotatably supported by the housing 11 so as to be coaxially arranged therewith.
【００１５】電動パワーステアリング装置１０は、ラッ
ク軸１６にボールねじ４１を設けてあり、ボールねじ４
１に噛合うナット４２を電動モータ３０のスリーブ３３
の内側に間隙を介して配置し、このナット４２とスリー
ブ３３をトルクダンパによって回転方向に結合し、ボー
ルねじ４１とナット４２の間にスチールボール４３を保
持している。これにより、電動モータ３０の出力をトル
クダンパを介してナット４２に伝え、ナット４２の回転
をボールねじ４１によりラック軸１６の直線運動に変換
する。In the electric power steering apparatus 10, a ball screw 41 is provided on the rack shaft 16, and the ball screw 4 is provided.
The nut 42 that meshes with the sleeve 1 of the electric motor 30
The nut 42 and the sleeve 33 are connected in the rotational direction by a torque damper, and a steel ball 43 is held between the ball screw 41 and the nut 42. As a result, the output of the electric motor 30 is transmitted to the nut 42 via the torque damper, and the rotation of the nut 42 is converted into the linear movement of the rack shaft 16 by the ball screw 41.
【００１６】従って、電動パワーステアリング装置１０
は以下の如く動作する。
(1)操舵トルクセンサ２０が検出した操舵トルクが所定
値より低いとき、操舵アシスト力は不要であり、電動モ
ータ３０は駆動されない。Therefore, the electric power steering apparatus 10
Operates as follows. (1) When the steering torque detected by the steering torque sensor 20 is lower than a predetermined value, the steering assist force is unnecessary and the electric motor 30 is not driven.
【００１７】(2)操舵トルクセンサ２０が検出した操舵
トルクが所定値を越えるとき、操舵アシスト力を必要と
するから、電動モータ３０が駆動される。電動モータ３
０の発生トルクがスリーブ３３からトルクダンパを介し
てナット４２に伝えられ、ナット４２の回転をボールね
じ４１によりラック軸１６の直線運動とし、ラック軸１
６に連動する車輪に操舵アシスト力となって付与され
る。(2) When the steering torque detected by the steering torque sensor 20 exceeds a predetermined value, the steering assist force is required, so that the electric motor 30 is driven. Electric motor 3
The generated torque of 0 is transmitted from the sleeve 33 to the nut 42 via the torque damper, and the rotation of the nut 42 is converted into the linear movement of the rack shaft 16 by the ball screw 41.
The steering assist force is applied to the wheels interlocking with the steering wheel 6.
【００１８】以下、操舵トルクセンサ２０の構成につい
て説明する。トルクセンサ２０は、図２〜図４に示す如
く、入力軸１２に同軸結合した検出軸２１を、出力軸１
４に同軸結合した検出孔２２に挿入し、入力軸１２と出
力軸１４の相対回転方向で検出軸２１の軸直角外面と検
出孔２２の軸直角内面を対向するように配置している。The structure of the steering torque sensor 20 will be described below. As shown in FIGS. 2 to 4, the torque sensor 20 includes a detection shaft 21 coaxially coupled to the input shaft 12 and a detection shaft 21.
4 is inserted into the detection hole 22 coaxially coupled to the shaft 4, and the outer surface of the detection shaft 21 perpendicular to the shaft and the inner surface of the detection hole 22 are arranged to face each other in the relative rotation direction of the input shaft 12 and the output shaft 14.
【００１９】検出軸２１は、図２〜図５に示す如く、入
力軸１２の外周にピン２３で固定可能とされ、検出軸２
１の軸直角断面において相直交する２軸（長軸と短軸）
によって区分される４領域の外面のうち、相対する一方
の２領域の外面が上記２軸のそれぞれを長軸と短軸とす
る楕円２１Ａの１／４円弧からなり、相対する他方の２
領域の外面がそれらに相隣る上記他の２領域の楕円２１
Ａの１／４円弧をつなぐ平面２１Ｂからなる。２１Ｃは
ピン孔である。また、検出孔２２は、図２〜図４、図６
に示す如く、出力軸１４の外周にピン２４で固定可能と
され、軸直角内面を楕円２２Ａからなるものとする。２
２Ｂはピン孔である。そして、検出軸２１の楕円２１Ａ
と検出孔２２の楕円２２Ａはほぼ同一曲率からなる部分
を対向するように配置している。As shown in FIGS. 2 to 5, the detection shaft 21 can be fixed to the outer periphery of the input shaft 12 by a pin 23.
Two axes (long axis and short axis) orthogonal to each other in a cross section perpendicular to the axis of 1
Of the outer surfaces of the four areas divided by, the outer surface of one of the two opposing areas is formed of a quarter arc of an ellipse 21A having the major axis and the minor axis of the two axes, respectively, and the other two opposing surfaces.
The ellipse 21 of the other two areas mentioned above in which the outer surface of the area is adjacent to them.
It is composed of a flat surface 21B connecting the quarter arcs of A. 21C is a pin hole. In addition, the detection hole 22 is shown in FIGS.
As shown in FIG. 5, the output shaft 14 can be fixed to the outer periphery by a pin 24, and the inner surface perpendicular to the shaft is an ellipse 22A. Two
2B is a pin hole. Then, the ellipse 21A of the detection axis 21
The ellipse 22A of the detection hole 22 is arranged so that the portions having substantially the same curvature face each other.
【００２０】また、検出軸２１と検出孔２２の周囲、換
言すれば検出軸２１の軸直角外面と検出孔２２の軸直角
内面が対向している部分の側傍には検出コイル２５が配
置される。検出コイル２５はハウジング１１に支持され
る。A detection coil 25 is arranged around the detection shaft 21 and the detection hole 22, in other words, on the side of the portion where the outer surface of the detection shaft 21 perpendicular to the axis and the inner surface of the detection hole 22 perpendicular to the axis face each other. It The detection coil 25 is supported by the housing 11.
【００２１】更に、トルクセンサ２０はトルク検出回路
を有している。トルク検出回路は、入力軸２１の軸直角
外面と出力軸２２の軸直角内面の回転方向の距離（相対
する検出軸２１の楕円２１Ａと検出孔２２の楕円２２Ａ
の間隔Ａ）の変位による磁気的変化（透磁率等の変化）
に基づく検出コイル２５のインダクタンス変化を電気的
に検出し、このインダクタンス変化からトルクを検出す
る。Further, the torque sensor 20 has a torque detection circuit. The torque detection circuit has a distance in the rotation direction between the outer surface at right angles to the input shaft 21 and the inner surface at right angles to the output shaft 22 (the ellipse 21A of the detection shaft 21 and the ellipse 22A of the detection hole 22 facing each other).
Change due to displacement of the distance A) (change in permeability etc.)
The change in the inductance of the detection coil 25 based on the above is electrically detected, and the torque is detected from the change in the inductance.
【００２２】トルクセンサ２０のあっては、入力軸１２
を一方の操舵方向（例えば右回転）に据切ったとき、検
出軸２１の楕円２１Ａを検出孔２２の楕円２２Ａに当接
（又は最も近接）させ、楕円２１Ａと楕円２２Ａの間隔
Ａを零（又は最小値Ａmin）にセットする。また、入力
軸１２が他方の操舵方向（例えば左回転）に据切ったと
き、検出軸２１の楕円２１Ａを検出孔２２の楕円２２Ａ
から最も離隔させ、楕円２１Ａと楕円２２Ａの間隔Ａを
最大値Ａmaxにセットする。そして、入力軸１２が中立
位置にあるとき、検出軸２１の楕円２１Ａと検出孔２２
の楕円２２Ａの間隔Ａを、ＡminとＡmaxの中間値Ａnに
セットする。これにより、トルクセンサ２０は、入力軸
１２の中立位置からの操舵方向（右回転と左回転）を簡
易かつ確実に判別可能とする。With the torque sensor 20, the input shaft 12
When the steering wheel is set in one steering direction (for example, clockwise rotation), the ellipse 21A of the detection shaft 21 is brought into contact with (or closest to) the ellipse 22A of the detection hole 22, and the distance A between the ellipses 21A and 22A is set to zero ( Or set to the minimum value Amin). Further, when the input shaft 12 is fully set in the other steering direction (for example, left rotation), the ellipse 21A of the detection shaft 21 is replaced with the ellipse 22A of the detection hole 22.
And the distance A between the ellipses 21A and 22A is set to the maximum value Amax. When the input shaft 12 is in the neutral position, the ellipse 21A of the detection shaft 21 and the detection hole 22
The interval A of the ellipse 22A is set to an intermediate value An between Amin and Amax. This allows the torque sensor 20 to easily and reliably determine the steering direction (right rotation and left rotation) from the neutral position of the input shaft 12.
【００２３】従って、トルクセンサ２０にあっては、ス
テアリングホイールに加えた操舵トルクが入力軸１２に
付与され、トーションバー１３の弾性トルク変形によ
り、入力軸１２と出力軸１４の間に回転方向の相対変位
を生ずると、入力軸１２と出力軸１４の回転方向の変位
が検出軸２１の楕円２１Ａと検出孔２２の楕円２２Ａの
回転方向の距離Ａを変位させるものになり、この距離Ａ
の変位により検出コイル２５の周辺の磁気的変化に起因
する検出コイル２５のインダクタンスが変化する。トル
ク検出回路は、この検出コイル２５のインダクタンスの
変化により操舵トルクを検出する。Therefore, in the torque sensor 20, the steering torque applied to the steering wheel is applied to the input shaft 12, and the elastic torque deformation of the torsion bar 13 causes a rotational direction between the input shaft 12 and the output shaft 14. When the relative displacement occurs, the displacement of the input shaft 12 and the output shaft 14 in the rotational direction displaces the rotational distance A of the ellipse 21A of the detection shaft 21 and the ellipse 22A of the detection hole 22.
The displacement of changes the inductance of the detection coil 25 due to the magnetic change around the detection coil 25. The torque detection circuit detects the steering torque based on the change in the inductance of the detection coil 25.
【００２４】本実施形態によれば以下の作用がある。
入力軸１２と出力軸１４の一方に結合した検出軸２１
の軸直角外面（楕円２１Ａ）と、他方に結合した検出孔
２２の軸直角内面（楕円２２Ａ）の回転方向の距離Ａの
変位に起因する磁気的変化によってトルクを検出するも
のであるから、温度変化による入力軸１２の軸方向の伸
縮等に起因するトルクの誤検出を招く虞がない。即ち、
検出トルクに対する温度変化の影響を小さくし、検出精
度を向上することができる。According to this embodiment, there are the following effects. A detection shaft 21 coupled to one of the input shaft 12 and the output shaft 14.
Since the torque is detected by a magnetic change caused by a displacement of the rotation direction distance A between the outer surface (ellipse 21A) perpendicular to the axis and the inner surface (ellipse 22A) perpendicular to the axis of the detection hole 22 coupled to the other, the temperature is detected. There is no risk of erroneous detection of torque due to expansion or contraction of the input shaft 12 in the axial direction due to changes. That is,
It is possible to reduce the influence of temperature change on the detected torque and improve the detection accuracy.
【００２５】検出孔２２の軸直角内面が楕円２２Ａを
なし、検出軸２１の軸直角外面が楕円２１Ａと平面２１
Ｂからなるものにしたから、検出軸２１の軸直角外面
（楕円２１Ａ）と検出孔２２の軸直角内面（楕円２２
Ａ）の回転方向の距離Ａの変位による磁気的変化に基づ
くトルクの検出を安定的に行なうことができる。The inner surface of the detection hole 22 perpendicular to the axis forms an ellipse 22A, and the outer surface of the detection shaft 21 perpendicular to the axis forms an ellipse 21A and a plane 21.
Since it is made of B, the outer surface (ellipse 21A) perpendicular to the axis of the detection shaft 21 and the inner surface (ellipse 22) of the detection hole 22 perpendicular to the axis.
It is possible to stably detect the torque based on the magnetic change due to the displacement of the distance A in the rotation direction of A).
【００２６】以上、本発明の実施の形態を図面により詳
述したが、本発明の具体的な構成はこの実施の形態に限
られるものではなく、本発明の要旨を逸脱しない範囲の
設計の変更等があっても本発明に含まれる。例えば、本
発明が適用される電動パワーステアリング装置では、電
動モータの出力が歯車列（ウォームギア装置等）を介し
て出力軸に伝えられ、ひいてはラック軸に伝えられるも
のでも良い。The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. Etc. are included in the present invention. For example, in the electric power steering device to which the present invention is applied, the output of the electric motor may be transmitted to the output shaft via the gear train (worm gear device or the like), and further to the rack shaft.
【００２７】[0027]
【発明の効果】以上のように本発明によれば、トルクセ
ンサにおいて、検出トルクに対する温度変化の影響を小
さくし、検出精度を向上することができる。As described above, according to the present invention, in the torque sensor, the influence of temperature change on the detected torque can be reduced and the detection accuracy can be improved.
【図１】図１は電動パワーステアリング装置を一部破断
して示す正面図である。FIG. 1 is a partially cutaway front view of an electric power steering device.
【図２】図２は図１のII−II線に沿う断面図である。FIG. 2 is a sectional view taken along the line II-II in FIG.
【図３】図３は図２のIII−III線に沿う断面図である。FIG. 3 is a sectional view taken along the line III-III in FIG.
【図４】図４は図２のIV−IV線に沿う断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG.
【図５】図５は検出軸を示し、（Ａ）は断面図、（Ｂ）
は底面図である。FIG. 5 shows a detection axis, (A) is a cross-sectional view, and (B).
Is a bottom view.
【図６】図６は検出孔を示し、（Ａ）は断面図、（Ｂ）
は平面図である。6A and 6B show detection holes, FIG. 6A is a sectional view, and FIG.
Is a plan view.
１２ 入力軸 １３ トーションバー １４ 出力軸 ２１ 検出軸 ２１Ａ 楕円 ２１Ｂ 平面 ２２ 検出孔 ２２Ａ 楕円 ２５ 検出コイル 12 input axes 13 torsion bar 14 Output shaft 21 Detection axis 21A ellipse 21B plane 22 Detection hole 22A ellipse 25 detection coil
Claims (3)
したトルクセンサにおいて、 入力軸と出力軸の一方に結合した検出軸を、他方に結合
した検出孔に挿入し、入力軸と出力軸の相対回転方向で
検出軸の軸直角外面と検出孔の軸直角内面を対向するよ
うに配置し、検出軸の軸直角外面と検出孔の軸直角内面
の上記回転方向の距離の変位による磁気的変化によりト
ルクを検出することを特徴とするトルクセンサ。1. In a torque sensor in which an input shaft and an output shaft are connected by a torsion bar, a detection shaft coupled to one of the input shaft and the output shaft is inserted into a detection hole coupled to the other, and the input shaft and the output shaft are connected to each other. The outer surface of the detection shaft and the inner surface of the detection hole are arranged to face each other in the relative rotation direction, and the magnetic change due to the displacement of the distance in the above-mentioned rotational direction between the outer surface of the detection shaft and the inner surface of the detection hole. A torque sensor characterized by detecting torque by means of.
したトルクセンサにおいて、 入力軸と出力軸の一方に結合した検出軸を、他方に結合
した検出孔に挿入し、入力軸と出力軸の相対回転方向で
検出軸の軸直角外面と検出孔の軸直角内面を対向するよ
うに配置し、 検出軸の軸直角外面と検出孔の軸直角内面が対向する部
分の側傍に検出コイルを配置し、 検出軸の軸直角外面と検出孔の軸直角内面の上記回転方
向の距離の変位による磁気的変化に基づく検出コイルの
インダクタンス変化を電気的に検出し、このインダクタ
ンス変化からトルクを検出する手段を有してなることを
特徴とするトルクセンサ。2. In a torque sensor in which an input shaft and an output shaft are connected by a torsion bar, a detection shaft connected to one of the input shaft and the output shaft is inserted into a detection hole connected to the other, and the detection shaft of the input shaft and the output shaft is connected. The detection coil is arranged on the side of the part where the outer surface of the detection shaft and the inner surface of the detection hole are opposed to each other, and the outer surface of the detection shaft and the inner surface of the detection hole are opposed to each other in the relative rotation direction. A means for electrically detecting the inductance change of the detection coil based on the magnetic change caused by the displacement of the distance in the rotation direction between the outer surface perpendicular to the axis of the detection shaft and the inner surface perpendicular to the axis of the detection hole, and detecting the torque from this inductance change. A torque sensor comprising:
分される４領域の外面のうち、相対する一方の２領域の
外面が上記２軸のそれぞれを長軸と短軸とする楕円の１
／４円弧からなり、相対する他方の２領域の外面がそれ
らに相隣る上記他の２領域の楕円の１／４円弧をつなぐ
平面からなる請求項１又は２に記載のトルクセンサ。3. The detection hole has an inner surface perpendicular to the axis that is an ellipse, and the outer surface of one of the two opposite areas among the outer surfaces of the four areas divided by two axes orthogonal to each other in a cross section perpendicular to the axis of the detection axis is the above-mentioned 2 1 of an ellipse with each major and minor axis
3. The torque sensor according to claim 1, wherein the torque sensor is formed of a / 4 arc, and the outer surface of the other two areas facing each other is a plane connecting the ¼ arcs of the ellipses of the other two areas adjacent to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001310584A JP2003114157A (en) | 2001-10-05 | 2001-10-05 | Torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001310584A JP2003114157A (en) | 2001-10-05 | 2001-10-05 | Torque sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003114157A true JP2003114157A (en) | 2003-04-18 |
Family
ID=19129530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001310584A Withdrawn JP2003114157A (en) | 2001-10-05 | 2001-10-05 | Torque sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003114157A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008256A (en) * | 2005-06-29 | 2007-01-18 | Jtekt Corp | Power steering device |
-
2001
- 2001-10-05 JP JP2001310584A patent/JP2003114157A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008256A (en) * | 2005-06-29 | 2007-01-18 | Jtekt Corp | Power steering device |
| JP4622703B2 (en) * | 2005-06-29 | 2011-02-02 | 株式会社ジェイテクト | Power steering device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20041207 |