JP2007121162A - Torque sensor and electric power steering device - Google Patents

Torque sensor and electric power steering device Download PDF

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JP2007121162A
JP2007121162A JP2005315291A JP2005315291A JP2007121162A JP 2007121162 A JP2007121162 A JP 2007121162A JP 2005315291 A JP2005315291 A JP 2005315291A JP 2005315291 A JP2005315291 A JP 2005315291A JP 2007121162 A JP2007121162 A JP 2007121162A
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torque
torque sensor
bobbin
core
housing
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Shinichi Tokura
真一 戸倉
Yasuhiro Zaike
康弘 戝家
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Showa Corp
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Showa Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost of a torque sensor when providing a torque detection coil and a temperature compensation coil in a housing by reducing the number of components and the number of assembling man-hours. <P>SOLUTION: In a torque sensor 30, in which an input shaft 14 and an output shaft 15 housed in housings 11 and 12 are connected through a torsion bar 16, and a torque detection coil 60 and a temperature compensation coil 70 are provided in the housing 12, a bobbin 80 for the torque detection coil and the bobbin 80 for the temperature compensation coil are integrally resin molded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はトルクセンサ及び電動パワーステアリング装置に関する。   The present invention relates to a torque sensor and an electric power steering apparatus.

電動パワーステアリング装置は、ステアリングホイールが結合される入力軸と、出力軸とがトーションバーを介して連結され、ステアリングホイールに加えられた操舵トルクをトルクセンサにより検出し、その検出トルクにより電動モータを駆動し、電動モータの発生トルクを出力軸側に伝え、結果として、電動モータの発生トルクを運転者がステアリングホイールに加える操舵力に対するアシスト力として用いる。   In the electric power steering apparatus, an input shaft to which a steering wheel is coupled and an output shaft are connected via a torsion bar, and a steering torque applied to the steering wheel is detected by a torque sensor, and the electric motor is driven by the detected torque. The generated torque of the electric motor is transmitted to the output shaft side, and as a result, the generated torque of the electric motor is used as an assist force for the steering force applied to the steering wheel by the driver.

従来のトルクセンサは、特許文献１に記載の如く、入力軸と出力軸のそれぞれを入力軸受と出力軸受のそれぞれを介してハウジングに回転可能に支持し、入力軸と出力軸のそれぞれに固定される第１と第２のコアとともに磁気回路を構成するトルク検出コイルをハウジングに設け、入力軸と出力軸とを連結したトーションバーに作用するトルクを検出する。   As described in Patent Document 1, a conventional torque sensor supports an input shaft and an output shaft rotatably on a housing via an input bearing and an output bearing, and is fixed to each of the input shaft and the output shaft. A torque detection coil that constitutes a magnetic circuit together with the first and second cores is provided in the housing to detect the torque acting on the torsion bar connecting the input shaft and the output shaft.

また、特許文献１のトルクセンサでは、磁性材料からなる入力軸の外周円筒部とともに磁気回路を構成する温度補償コイルをハウジングに設け、トルク検出コイルと温度補償コイルの誘起電圧の差を求めることにより、周囲温度変化による誘起電圧相等分を相殺し、トルクセンサの検出精度を向上する。
特開2005-3462 Moreover, in the torque sensor of patent document 1, the temperature compensation coil which comprises a magnetic circuit with the outer peripheral cylindrical part of the input shaft which consists of magnetic materials is provided in a housing, and the difference of the induced voltage of a torque detection coil and a temperature compensation coil is calculated | required. In addition, the induced voltage phase due to the ambient temperature change is offset and the detection accuracy of the torque sensor is improved.
JP2005-3462

特許文献１のトルクセンサでは、トルク検出コイルと温度補償コイルをハウジングに設けるに際し、トルク検出コイルと温度補償コイルをそれぞれ別個のボビンに巻装し、それら別個のボビンをそれぞれハウジングに取付けることとしている。このため、２個のボビンを必要として部品数が多く、組付工数も多い。   In the torque sensor disclosed in Patent Document 1, when the torque detection coil and the temperature compensation coil are provided in the housing, the torque detection coil and the temperature compensation coil are wound around separate bobbins, and the separate bobbins are respectively attached to the housing. . For this reason, two bobbins are required, and there are many parts and many assembly steps.

本発明の課題は、トルクセンサにおいて、トルク検出コイルと温度補償コイルをハウジングに設けるに際し、部品数と組付工数を少なくし、コスト低減することにある。   An object of the present invention is to reduce the number of parts and the number of assembling steps and reduce the cost when providing a torque detection coil and a temperature compensation coil in a housing in a torque sensor.

請求項１の発明は、ハウジングに収容される入力軸と出力軸がトーションバーを介して連結され、トルク検出コイルと温度補償コイルをハウジングに設けてなるトルクセンサにおいて、トルク検出コイル用ボビンと温度補償コイル用ボビンを一体に樹脂成形してなるようにしたものである。   The invention according to claim 1 is a torque sensor in which an input shaft and an output shaft accommodated in a housing are connected via a torsion bar, and a torque detection coil and a temperature compensation coil are provided in the housing. The compensation coil bobbin is integrally molded with resin.

請求項２の発明は、請求項１の発明において更に、前記ボビンと、該ボビンに巻装したトルク検出コイル及び温度補償コイルを、磁性金属粉を混合した樹脂製ヨークでインサートモールドするようにしたものである。   According to a second aspect of the present invention, in the first aspect of the present invention, the bobbin, the torque detection coil and the temperature compensation coil wound around the bobbin are insert-molded with a resin yoke mixed with magnetic metal powder. Is.

請求項３の発明は、請求項２の発明において更に、前記入力軸を支持する入力軸受と、前記ヨークを、樹脂製ハウジングでインサートモールドするようにしたものである。   According to a third aspect of the present invention, in the second aspect of the present invention, the input bearing that supports the input shaft and the yoke are insert-molded with a resin housing.

請求項４の発明は、ステアリングホイールが結合される入力軸と、電動モータに連動する出力軸とを有し、請求項１〜３のいずれかに記載のトルクセンサの検出トルクにより電動モータを駆動制御する電動パワーステアリング装置である。   The invention according to claim 4 has an input shaft to which the steering wheel is coupled and an output shaft interlocked with the electric motor, and drives the electric motor by the torque detected by the torque sensor according to any one of claims 1 to 3. An electric power steering device to be controlled.

（請求項１）
(a)トルク検出コイルと温度補償コイルをハウジングに設けるに際し、トルク検出コイル用のボビンと温度補償コイル用のボビンを一体のボビンに樹脂成形して単一化したから、トルクセンサの部品数と組付工数し少なくし、組付けバラツキを押さえてコスト低減できる。 (Claim 1)
(a) When the torque detection coil and the temperature compensation coil are provided in the housing, the torque detection coil bobbin and the temperature compensation coil bobbin are molded into a single bobbin and unified into a single bobbin. Costs can be reduced by reducing assembly man-hours and suppressing assembly variations.

（請求項２）
(b)上述(a)のボビンと、該ボビンに巻装したトルク検出コイル及び温度補償コイルを、磁性金属粉を混合した樹脂製ヨークでインサートモールドしたから、トルクセンサの部品数と組付工数を一層少なくできる上に、ヨークがボビンとコイルとの間に形成するエアギャップを可及的に低減し、トルクセンサの検出精度を向上できる。 (Claim 2)
(b) Since the above-described bobbin (a), the torque detection coil and the temperature compensation coil wound around the bobbin are insert-molded with a resin yoke mixed with magnetic metal powder, the number of torque sensor components and assembly man-hours In addition, the air gap formed between the bobbin and the coil by the yoke can be reduced as much as possible, and the detection accuracy of the torque sensor can be improved.

（請求項３）
(c)上述(b)のヨークと、入力軸を支持する入力軸受を樹脂製ハウジングでインサートモールドしたから、トルクセンサの部品数と組付工数を一層少なくできる。 (Claim 3)
(c) Since the yoke of (b) and the input bearing that supports the input shaft are insert-molded with a resin housing, the number of torque sensor components and assembly man-hours can be further reduced.

（請求項４）
(d)電動パワーステアリング装置のトルクセンサにおいて、上述(a)〜(d)を実現できる。これにより、ステアリングホイールに加えた操舵トルクの検出精度を向上させ、電動モータによるアシスト性能を向上できる。 (Claim 4)
(d) In the torque sensor of the electric power steering apparatus, the above (a) to (d) can be realized. Thereby, the detection accuracy of the steering torque applied to the steering wheel can be improved, and the assist performance by the electric motor can be improved.

図１は電動パワーステアリング装置の要部を示す断面図、図２はトルクセンサを拡大して示す断面図、図３はヨークへのボビンのインサートモールド成形体を示す断面図、図４は第１のコアと第２のコアを拡大して示す断面図、図５はトルクセンサの模式図である。   1 is a cross-sectional view showing the main part of the electric power steering apparatus, FIG. 2 is an enlarged cross-sectional view showing a torque sensor, FIG. 3 is a cross-sectional view showing an insert-molded body of a bobbin to a yoke, and FIG. Sectional drawing which expands and shows the core and the 2nd core, FIG. 5 is a schematic diagram of a torque sensor.

電動パワーステアリング装置１０は、図１に示す如く、車体フレーム等に固定される第１ハウジング１１に第２ハウジング１２をボルト結合する。そして、ステアリングホイールが結合される入力軸１４と、出力軸１５をトーションバー１６を介して同軸結合し、入力軸１４は入力軸受１７を介して第２ハウジング１２に支持し、出力軸１５は出力軸受１８（不図示）を介して第１ハウジング１１側に支持する。   As shown in FIG. 1, the electric power steering apparatus 10 bolts a second housing 12 to a first housing 11 fixed to a vehicle body frame or the like. The input shaft 14 to which the steering wheel is coupled and the output shaft 15 are coaxially coupled via a torsion bar 16. The input shaft 14 is supported by the second housing 12 via an input bearing 17, and the output shaft 15 is an output. It supports to the 1st housing 11 side via the bearing 18 (not shown).

電動パワーステアリング装置１０は、出力軸１５にピニオン軸を連結し、ピニオン軸のピニオンに噛み合うラックを備えたラック軸をハウジングに左右動可能に支持する。出力軸１５の回転運動をピニオン軸を介してラック軸の直線運動に変換し、車輪を操舵する。   The electric power steering device 10 connects a pinion shaft to the output shaft 15 and supports a rack shaft including a rack that meshes with the pinion of the pinion shaft so that the rack shaft can move left and right. The rotary motion of the output shaft 15 is converted into the linear motion of the rack shaft via the pinion shaft, and the wheels are steered.

電動パワーステアリング装置１０は、第１ハウジング１１に電動モータ（不図示）を支持し、電動モータの出力軸にはウォームギヤ２１が結合され、ウォームギヤ２１に噛み合うウォームホイール２２を第１ハウジング１１と第２ハウジング１２の中で出力軸１５に固定してある。   The electric power steering apparatus 10 supports an electric motor (not shown) on a first housing 11, a worm gear 21 is coupled to an output shaft of the electric motor, and a worm wheel 22 meshing with the worm gear 21 is connected to the first housing 11 and the second housing 11. The housing 12 is fixed to the output shaft 15.

電動パワーステアリング装置１０は、入力軸１４と出力軸１５の間にトルクセンサ３０を設けている。ステアリングホイールに加えられた操舵トルクをトルクセンサ３０により検出し、その検出トルクにより電動モータを駆動し、電動モータの発生トルクをウォームギヤ２１、ウォームホイール２２を介して出力軸１５に伝える。これにより、電動モータの発生トルクを運転者がステアリングホイールに加える操舵力に対するアシスト力として用いる。   The electric power steering apparatus 10 is provided with a torque sensor 30 between the input shaft 14 and the output shaft 15. The steering torque applied to the steering wheel is detected by the torque sensor 30, the electric motor is driven by the detected torque, and the generated torque of the electric motor is transmitted to the output shaft 15 via the worm gear 21 and the worm wheel 22. Thereby, the torque generated by the electric motor is used as an assist force for the steering force applied by the driver to the steering wheel.

しかるに、トルクセンサ３０は以下の如くに構成される（図２）。
入力軸１４は、磁性材料からなり、ハウジング１２の内部に位置して出力軸１５に同軸的に結合されている部分の側傍に、磁性材料からなる大径カラーＡ及び大径リングＢの２部材を圧入等により同軸固定的に取付けている。大径カラーＡには第１のコア４０を圧入等により同軸固定的に取付け、第１のコア４０の下端端面には周方向に等ピッチで形成された平面視矩形の多数の磁路形成部４０Ａを備える。 However, the torque sensor 30 is configured as follows (FIG. 2).
The input shaft 14 is made of a magnetic material, and the large diameter collar A and the large diameter ring B 2 made of a magnetic material are located beside the portion that is located inside the housing 12 and is coaxially coupled to the output shaft 15. The member is fixed coaxially by press fitting or the like. The first core 40 is coaxially fixed to the large-diameter collar A by press-fitting or the like, and a plurality of rectangular magnetic path forming portions having a rectangular shape in plan view formed at equal pitches in the circumferential direction on the lower end surface of the first core 40 40A is provided.

出力軸１５は、ハウジング１２の内部に位置して入力軸１４に同軸的に結合されている部分の外周に円筒状の第２のコア５０を圧入固定的に取付けている。第２のコア５０の上端部端面には、第１のコア４０の磁路形成部４０Ａに対向する、周方向に等ピッチで形成された平面視矩形の多数の磁路形成部５０Ａを備える。   The output shaft 15 has a cylindrical second core 50 attached to the outer periphery of a portion located inside the housing 12 and coaxially coupled to the input shaft 14 in a press-fit manner. On the end surface of the upper end portion of the second core 50, a large number of magnetic path forming portions 50 </ b> A having a rectangular shape in plan view and formed at an equal pitch in the circumferential direction are provided opposite to the magnetic path forming portions 40 </ b> A of the first core 40.

ハウジング１２の内周には、トルク検出コイル６０と温度補償コイル７０を巻装したボビン８０、ボビン８０を被包するヨーク９０が以下の如くに装填されている（図２、図３）。   A bobbin 80 around which the torque detection coil 60 and the temperature compensation coil 70 are wound and a yoke 90 that encloses the bobbin 80 are loaded on the inner periphery of the housing 12 as follows (FIGS. 2 and 3).

(1)トルク検出コイル６０用のボビンと温度補償コイル７０用のボビンが合成樹脂により一体成形され、ボビン８０を構成する。   (1) A bobbin for the torque detection coil 60 and a bobbin for the temperature compensation coil 70 are integrally formed of synthetic resin to constitute a bobbin 80.

(2)上述(1)のボビン８０の外周の上下２箇所のそれぞれに設けたコイル巻回部８１とコイル巻回部８２のそれぞれに、トルク検出コイル６０と温度補償コイル７０のそれぞれを巻回する。   (2) Each of the torque detection coil 60 and the temperature compensation coil 70 is wound around the coil winding portion 81 and the coil winding portion 82 provided respectively at the upper and lower portions of the outer periphery of the bobbin 80 described in (1) above. To do.

(3)上述(2)のボビン８０と、ボビン８０に巻装したトルク検出コイル６０及び温度補償コイル７０を金型内に組込んだ状態で、鉄粉等の磁性金属粉を混合した合成樹脂からなるヨーク９０をボビン８０並びにトルク検出コイル６０及び温度補償コイル７０の外周側に射出成形し、それらボビン８０並びにトルク検出コイル６０及び温度補償コイル７０をヨーク９０でインサートモールドする。   (3) Synthetic resin in which the magnetic metal powder such as iron powder is mixed with the bobbin 80 of the above (2), the torque detection coil 60 and the temperature compensation coil 70 wound around the bobbin 80 incorporated in the mold. The yoke 90 is formed by injection molding on the outer periphery side of the bobbin 80, the torque detection coil 60, and the temperature compensation coil 70, and the bobbin 80, the torque detection coil 60, and the temperature compensation coil 70 are insert-molded by the yoke 90.

(4)入力軸受１７と、上述(3)のヨーク９０を金型内に組込んだ状態で、合成樹脂からなるハウジング１２を入力軸受１７及びヨーク９０の外周側に射出成形し、それら入力軸受１７及びヨーク９０をハウジング１２でインサートモールドする。   (4) With the input bearing 17 and the yoke 90 of (3) described above incorporated in the mold, the housing 12 made of synthetic resin is injection-molded on the outer peripheral side of the input bearing 17 and the yoke 90, and these input bearings 17 and the yoke 90 are insert molded in the housing 12.

上述(4)の第２ハウジング１２に第１ハウジング１１をボルト結合し、第２ハウジング１２の入力軸受１７に入力軸１４を支持し、第１ハウジング１１の出力軸受１８に出力軸１５を支持した状態で、トルク検出コイル６０は入力軸１４の大径カラーＡと出力軸１５のそれぞれに取付けている第１のコア４０と第２のコア５０の対向部分に跨り、トルク検出コイル６０の外周のヨーク９０は第１のコア４０、第２のコア５０と磁気回路ａを構成し、この磁気回路ａはヨーク９０と第１のコア４０の表面とのエアギャップａ1、第２のコア５０の表面とのエアギャップａ2、及び第１のコア４０と第２のコア５０の対向端面間のエアギャップａ3を経るように形成される。トルク検出コイル６０は第１のコア４０、第２のコア５０と電磁結合し、電磁結合状態に相応する電圧を誘起する。   The first housing 11 is bolted to the second housing 12 described in (4) above, the input shaft 14 is supported by the input bearing 17 of the second housing 12, and the output shaft 15 is supported by the output bearing 18 of the first housing 11. In this state, the torque detection coil 60 straddles the opposing portions of the first core 40 and the second core 50 attached to the large-diameter collar A of the input shaft 14 and the output shaft 15, respectively. The yoke 90 constitutes the first core 40 and the second core 50 and the magnetic circuit a. The magnetic circuit a is an air gap a 1 between the yoke 90 and the surface of the first core 40, and the surface of the second core 50. And an air gap a3 between the opposing end surfaces of the first core 40 and the second core 50. The torque detection coil 60 is electromagnetically coupled to the first core 40 and the second core 50 and induces a voltage corresponding to the electromagnetic coupling state.

温度補償コイル７０は入力軸１４の大径リングＢに対向し、温度補償コイル７０の外周のヨーク９０は大径リングＢと磁気回路ｂを構成し、この磁気回路ｂはヨーク９０と大径リングＢの表面とのエアギャップｂ1、ｂ2を経るように形成される。尚、大径リングＢは入力軸１４を拡径させたフランジであっても良く、所定のエアギャップを設けられれば良い。温度補償コイル７０は大径リングＢと電磁結合し、温度補償のための電磁結合状態に相応する電圧を誘起する。   The temperature compensation coil 70 faces the large-diameter ring B of the input shaft 14, and the yoke 90 on the outer periphery of the temperature compensation coil 70 constitutes the large-diameter ring B and the magnetic circuit b. It is formed so as to pass through air gaps b1 and b2 with the surface of B. The large-diameter ring B may be a flange in which the diameter of the input shaft 14 is increased, and it is sufficient if a predetermined air gap is provided. The temperature compensation coil 70 is electromagnetically coupled to the large-diameter ring B and induces a voltage corresponding to the electromagnetic coupling state for temperature compensation.

トーションバー１６にトルクが作用していない場合には、トルク検出コイル６０と温度補償コイル７０の誘起電圧が略等しくなるように、第１のコア４０、第２のコア５０、大径リングＢの電磁結合状態を求め、第１のコア４０、第２のコア５０をそれぞれ位置決めする。大径リングＢの外径は、磁気回路ｂ中のエアギャップｂ1、ｂ2のそれぞれが磁界に与える影響、即ちそれぞれの磁気抵抗ｇｂ1、ｇｂ2の和が、磁気回路ａ中のエアギャップａ1、ａ2、ａ3のそれぞれが磁界に与える影響、即ちそれぞれの磁気抵抗ｇａ1、ｇａ2、ｇａ3の和と等しくなるように設定される。   When no torque acts on the torsion bar 16, the first core 40, the second core 50, and the large-diameter ring B are set so that the induced voltages of the torque detection coil 60 and the temperature compensation coil 70 are substantially equal. The electromagnetic coupling state is obtained, and the first core 40 and the second core 50 are respectively positioned. The outer diameter of the large-diameter ring B depends on the influence of the air gaps b1 and b2 in the magnetic circuit b on the magnetic field, that is, the sum of the respective magnetic resistances gb1 and gb2 is the air gaps a1 and a2 in the magnetic circuit a. Each of a3 is set to be equal to the influence of the magnetic field, that is, the sum of the respective magnetic resistances ga1, ga2, and ga3.

従って、トルクセンサ３０にあっては、トルク検出コイル６０と温度補償コイル７０の誘起電圧の差を求めることにより、周囲温度変化による誘起電圧を相殺し、第１のコア４０と第２のコア５０の相対回転量に相応した電磁結合状態を検出し、トーションバー１６に作用したトルク、換言すればステアリングホイールに加えられた操舵トルクのみを検出可能にする。   Therefore, in the torque sensor 30, the difference between the induced voltages of the torque detection coil 60 and the temperature compensation coil 70 is obtained to cancel the induced voltage due to the ambient temperature change, and the first core 40 and the second core 50. The electromagnetic coupling state corresponding to the relative rotation amount is detected, and only the torque acting on the torsion bar 16, in other words, the steering torque applied to the steering wheel can be detected.

以下、第１のコア４０と第２のコア５０の構成について説明する（図４）。
第１のコア４０は、ステンレス鋼、アルミニウム、銅、樹脂等の非磁性材料からなる遮蔽材４２を金型にセットし、この遮蔽材４２の周囲に、樹脂に鉄粉等の磁性材金属粉を混合した磁性材４１を鋳込んでインサートモールドしてなるものである。具体的には、遮蔽材４２は円筒状（円筒本体４２Ａ）をなし、下端部の周方向複数位置に歯４２Ｂを設け、相隣る歯４２Ｂの間の谷部４２Ｃに磁性材４１をモールドする。磁性材４１は遮蔽材４２の円筒本体４２Ａの内周にモールドされる円筒本体４１Ａと、円筒本体４１Ａの下端部の周方向複数か所からＬ形をなして径方向外方に突出する装填部分４１Ｂを形成し、装填部分４１Ｂの下向き端面である平面視矩形端面を歯４２Ｂの山部の下向き端面そのものに合致させて入力軸１４の中心軸に直交する平面に形成する。 Hereinafter, the configuration of the first core 40 and the second core 50 will be described (FIG. 4).
The first core 40 has a shielding material 42 made of a non-magnetic material such as stainless steel, aluminum, copper, resin, etc. set in a mold, and a magnetic metal powder such as iron powder or the like around the shielding material 42. The magnetic material 41 mixed with is cast and insert molded. Specifically, the shielding material 42 has a cylindrical shape (cylindrical body 42A), teeth 42B are provided at a plurality of positions in the circumferential direction of the lower end, and the magnetic material 41 is molded in a valley 42C between adjacent teeth 42B. . The magnetic material 41 includes a cylindrical main body 41A molded on the inner periphery of the cylindrical main body 42A of the shielding material 42, and a loading portion that protrudes radially outward in a L shape from a plurality of circumferential positions at the lower end of the cylindrical main body 41A. 41B is formed, and the rectangular end surface in plan view, which is the downward end surface of the loading portion 41B, is formed in a plane perpendicular to the central axis of the input shaft 14 by matching the downward end surface itself of the crest of the tooth 42B.

そして、第１のコア４０は、遮弊材４２の歯４２Ｂを磁性材４１に対する磁気的遮蔽部４０Ｂとする。第１のコア４０は、下端面の周方向で遮蔽材４２の遮蔽部４０Ｂ（歯４２Ｂ）が遮蔽する部分の側傍（相隣る遮蔽部４０Ｂ、４０Ｂに挟まれる平面視矩形部分）の磁性材４１の非遮蔽部（装填部分４１Ｂ）を、歯４２Ｂの山部の下向き端面そのものに合致させ、この非遮蔽部を前述の磁路形成部４０Ａとする。   The first core 40 uses the teeth 42 </ b> B of the shielding material 42 as a magnetic shielding part 40 </ b> B for the magnetic material 41. The first core 40 is magnetized on the side of the portion shielded by the shielding portion 40B (teeth 42B) of the shielding material 42 in the circumferential direction of the lower end surface (rectangular portion in plan view sandwiched between the adjacent shielding portions 40B and 40B). The non-shielding portion (loading portion 41B) of the material 41 is matched with the downward end surface of the crest of the tooth 42B, and this non-shielding portion is used as the above-described magnetic path forming portion 40A.

このとき、第１のコア４０は、磁性材４１を遮蔽材４２の円筒本体４２Ａの下端部〜中間部にモールドし、中間部〜上端部にはモールドしない。第１のコア４０は、この遮蔽材４２の円筒本体４２Ａを入力軸１４の大径カラーＡに圧入する。   At this time, the first core 40 molds the magnetic material 41 from the lower end portion to the intermediate portion of the cylindrical main body 42A of the shielding material 42 and does not mold it from the intermediate portion to the upper end portion. The first core 40 press-fits the cylindrical body 42 </ b> A of the shielding material 42 into the large-diameter collar A of the input shaft 14.

第２のコア５０は、ステンレス鋼、アルミニウム、銅、樹脂等の非磁性材料からなる遮蔽材５２を金型にセットし、この遮蔽材５２の周囲に、樹脂に鉄粉等の磁性材金属粉を混合した磁性材５１を鋳込でインサートモールドしてなるものである。具体的には、遮蔽材５２は円筒状（円筒本体５２Ａ）をなし、上端部の周方向複数位置に歯５２Ｂを設け、相隣る歯５２Ｂの間の谷部５２Ｃに磁性材５１をモールドする。磁性材５１は遮蔽材５２の円筒本体５２Ａの内周にモールドされる円筒本体５１Ａと、円筒本体５１Ａの上端部の周方向複数か所からＬ形をなして径方向外方に突出する装填部分５１Ｂを形成し、装填部分５１Ｂの上向き端面である平面視矩形端面を歯５２Ｂの山部の上向き端面そのものに合致させて出力軸１５の中心軸に直交する平面に形成する。   In the second core 50, a shielding material 52 made of a nonmagnetic material such as stainless steel, aluminum, copper, or resin is set in a mold. Around the shielding material 52, a magnetic material metal powder such as iron powder is applied to the resin. The magnetic material 51 mixed with is cast and insert molded. Specifically, the shielding material 52 has a cylindrical shape (cylindrical main body 52A), teeth 52B are provided at a plurality of positions in the circumferential direction of the upper end portion, and the magnetic material 51 is molded in the valley portions 52C between the adjacent teeth 52B. . The magnetic material 51 includes a cylindrical main body 51A molded on the inner periphery of the cylindrical main body 52A of the shielding material 52, and a loading portion that protrudes radially outward in an L shape from a plurality of circumferential positions at the upper end of the cylindrical main body 51A. 51B is formed, and the rectangular end surface in plan view, which is the upward end surface of the loading portion 51B, is formed in a plane perpendicular to the central axis of the output shaft 15 by matching the upward end surface of the tooth 52B.

そして、第２のコア５０は、遮弊材５２の歯５２Ｂを磁性材５１に対する磁気的遮蔽部５０Ｂとする。第２のコア５０は、上端面の周方向で遮蔽材５２の遮蔽部５０Ｂ（歯５２Ｂ）が遮蔽する部分の側傍（相隣る遮蔽部５０Ｂ、５０Ｂに挟まれる平面視矩形部分）の磁性材５１の非遮蔽部（装填部分５１Ｂ）を、歯５２Ｂの山部の上向き端面そのものに合致させ、この非遮蔽部を前述の磁路形成部５０Ａとする。   The second core 50 uses the teeth 52 </ b> B of the shielding material 52 as a magnetic shielding part 50 </ b> B for the magnetic material 51. The second core 50 is magnetic on the side of the portion shielded by the shielding portion 50B (teeth 52B) of the shielding material 52 in the circumferential direction of the upper end surface (rectangular portion in plan view sandwiched between adjacent shielding portions 50B and 50B). The non-shielding part (loading part 51B) of the material 51 is matched with the upward end surface itself of the crest of the tooth 52B, and this non-shielding part is used as the magnetic path forming part 50A.

このとき、第２のコア５０は、磁性材５１を遮蔽材５２の円筒本体５２Ａの上端部〜中間部にモールドし、中間部〜下端部にはモールドしない。第２のコア５０は、この遮蔽材５２の円筒本体５２Ａを出力軸１５に圧入する。   At this time, the second core 50 molds the magnetic material 51 on the upper end portion to the intermediate portion of the cylindrical main body 52A of the shielding material 52 and does not mold it on the intermediate portion to the lower end portion. The second core 50 press-fits the cylindrical body 52 </ b> A of the shielding material 52 into the output shaft 15.

第１のコア４０の磁路形成部４０Ａと第２のコア５０の磁路形成部５０Ａは適宜長離隔された対向関係をなす。本実施例において、第１のコア４０（磁性材４１、遮蔽材４２）と第２のコア５０（磁性材５１、遮蔽材５２）は内外径寸法、軸長寸法を同一とする同一形状とされている。   The magnetic path forming part 40A of the first core 40 and the magnetic path forming part 50A of the second core 50 have a facing relationship that is appropriately spaced apart. In the present embodiment, the first core 40 (magnetic material 41, shielding material 42) and the second core 50 (magnetic material 51, shielding material 52) have the same shape with the same inner and outer diameter dimensions and axial length dimensions. ing.

本実施例によれば以下の作用効果を奏する。
(a)トルク検出コイル６０と温度補償コイル７０をハウジング１２に設けるに際し、トルク検出コイル６０用のボビン８０と温度補償コイル７０用のボビン８０を一体のボビン８０に樹脂成形して単一化したから、トルクセンサ３０の部品数と組付工数し少なくし、コスト低減できる。 According to the present embodiment, the following operational effects can be obtained.
(a) When the torque detection coil 60 and the temperature compensation coil 70 are provided in the housing 12, the bobbin 80 for the torque detection coil 60 and the bobbin 80 for the temperature compensation coil 70 are resin-molded into a single bobbin 80 and unified. Therefore, the number of parts of the torque sensor 30 and the number of assembling steps can be reduced, thereby reducing the cost.

(b)上述(a)のボビン８０と、該ボビン８０に巻装したトルク検出コイル６０及び温度補償コイル７０を、磁性金属粉を混合した樹脂製ヨーク９０でインサートモールドしたから、トルクセンサ３０の部品数と組付工数を一層少なくできる上に、ヨーク９０がボビン８０とコイルとの間に形成するエアギャップを可及的に低減し、トルクセンサ３０の検出精度を向上する。   (b) Since the bobbin 80 of the above (a) and the torque detection coil 60 and the temperature compensation coil 70 wound around the bobbin 80 are insert-molded by the resin yoke 90 mixed with magnetic metal powder, the torque sensor 30 In addition to reducing the number of parts and the number of assembly steps, the air gap formed between the bobbin 80 and the coil by the yoke 90 is reduced as much as possible, and the detection accuracy of the torque sensor 30 is improved.

(c)上述(b)のヨーク９０と、入力軸１４を支持する入力軸受１７を樹脂製ハウジング１２でインサートモールドしたから、トルクセンサ３０の部品数と組付工数を一層少なくできる。   (c) Since the yoke 90 and the input bearing 17 that supports the input shaft 14 are insert-molded by the resin housing 12, the number of parts and the number of assembly steps of the torque sensor 30 can be further reduced.

(d)電動パワーステアリング装置１０のトルクセンサ３０において、上述(a)〜(d)を実現できる。これにより、ステアリングホイールに加えた操舵トルクの検出精度を向上させ、電動モータによるアシスト性能を向上できる。   (d) In the torque sensor 30 of the electric power steering apparatus 10, the above (a) to (d) can be realized. Thereby, the detection accuracy of the steering torque applied to the steering wheel can be improved, and the assist performance by the electric motor can be improved.

尚、本実施例によれば以下の作用効果も奏する。
(a)第１と第２のコア４０、５０の端面に非磁性材料からなる遮蔽材４２、５２を設け、遮蔽材４２、５２の遮蔽部４０Ｂ、５０Ｂの側傍の磁性材の非遮蔽部を磁路形成部４０Ａ、５０Ａとした。第１のコア４０の磁路形成部４０Ａと第２のコア５０の磁路形成部５０Ａの間で生ずる磁束の通路は、図５（Ｂ）の実線矢印で示す如くに、第１のコア４０において相隣る遮蔽材４２の遮蔽部４０Ｂと遮蔽部４０Ｂに挟まれる範囲の磁路形成部４０Ａ、第２のコア５０において相隣る遮蔽材５２の遮蔽部５０Ｂと遮蔽部５０Ｂに挟まれる範囲の磁路形成部５０Ａに限定され、図５（Ｂ）の破線矢印で示す如くの遮蔽部４０Ｂ、５０Ｂの側に回り込むことを抑制される。このため、入力軸１４と出力軸１５の間のトーションバー１６のねじれに伴なう、第１のコア４０の磁路形成部４０Ａと第２のコア５０の磁路形成部５０Ａの重なり面積（磁束通過面積）の変化のみに応じた透磁率の変化量となり、トルク検出コイル６０の検出出力幅を増大でき、ひいては検出精度及び感度を向上できる。 In addition, according to a present Example, there exist the following effects.
(a) The shielding members 42 and 52 made of a non-magnetic material are provided on the end surfaces of the first and second cores 40 and 50, and the non-shielding portion of the magnetic material beside the shielding portions 40B and 50B of the shielding materials 42 and 52. Were defined as magnetic path forming portions 40A and 50A. The path of the magnetic flux generated between the magnetic path forming portion 40A of the first core 40 and the magnetic path forming portion 50A of the second core 50 is the first core 40 as shown by the solid line arrow in FIG. The adjacent shield member 42 has a shield part 40B and a magnetic path forming part 40A in the range sandwiched between the shield parts 40B, and the second core 50 has a shield part 52B and the shield part 50B and the shield part 50B. It is limited to the magnetic path forming portion 50A, and it is possible to suppress the shield portions 40B and 50B from going around as shown by the broken line arrows in FIG. For this reason, the overlapping area of the magnetic path forming portion 40A of the first core 40 and the magnetic path forming portion 50A of the second core 50 accompanying the twist of the torsion bar 16 between the input shaft 14 and the output shaft 15 ( The amount of change in the magnetic permeability according to only the change in the magnetic flux passage area) can be increased, and the detection output width of the torque detection coil 60 can be increased.

(b)各コア４０、５０が、非磁性材料からなる遮蔽材４２、５２を、樹脂に磁性材金属粉を混合した磁性材４１、５１でインサートモールドしてなることにより、磁性材４１、５１と遮蔽材４２、５２のエアギャップをなくし、トルクセンサ３０の検出感度を向上できる。   (b) The cores 40 and 50 are formed by insert-molding the shielding materials 42 and 52 made of a non-magnetic material with the magnetic materials 41 and 51 in which the magnetic material metal powder is mixed with the resin. The air gap between the shielding members 42 and 52 can be eliminated, and the detection sensitivity of the torque sensor 30 can be improved.

(c)各コア４０、５０は、磁性材４１、５１と遮蔽材４２、５２の両部品の組立てのための寸法公差の管理の如くを不要とし、組立性を向上する。   (c) The cores 40 and 50 do not require management of dimensional tolerances for assembling both the magnetic members 41 and 51 and the shielding members 42 and 52, and improve the assemblability.

(d)磁性材４１、５１は、磁性材金属粉を樹脂に混合したものを、金型にセットされた遮蔽材４２、５２の周囲にモールドするだけで成形され、低コストになる。   (d) The magnetic materials 41 and 51 are formed simply by molding a mixture of magnetic material metal powder in a resin around the shielding materials 42 and 52 set in a mold, thereby reducing the cost.

(e)第１のコア４０の遮蔽材４２を入力軸の側に圧入し、第２のコア５０の遮弊材５２を出力軸の側に圧入するものであり、各コア４０、５０の組付性を簡易にできる。   (e) The shielding material 42 of the first core 40 is press-fitted to the input shaft side, and the shielding material 52 of the second core 50 is press-fitted to the output shaft side. Adhesiveness can be simplified.

(f)各コア４０、５０は、金型にセットされた遮蔽材４２、５２の相隣る歯４２Ｂ、５２Ｂの間の谷部４２Ｃ、５２Ｃに磁性材４１、５１をモールドすることで、組立性を向上できる。   (f) The cores 40 and 50 are assembled by molding the magnetic materials 41 and 51 in the valley portions 42C and 52C between the adjacent teeth 42B and 52B of the shielding materials 42 and 52 set in the mold. Can be improved.

(g)各コア４０、５０が、磁性材４１、５１を遮蔽材４２、５２の円筒本体４２Ａ、５２Ａの外周及び谷部４２Ｃ、５２Ｃの中にモールドしてなるから、磁性材４１、５１と遮蔽材４２、５２の結合強度を軸方向及び周方向で強化できる。   (g) Since each of the cores 40 and 50 is formed by molding the magnetic materials 41 and 51 into the outer periphery of the cylindrical main bodies 42A and 52A and the valley portions 42C and 52C of the shielding materials 42 and 52, the magnetic materials 41 and 51 The coupling strength of the shielding materials 42 and 52 can be enhanced in the axial direction and the circumferential direction.

(h)各コア４０、５０は、磁性材４１、５１を遮蔽材４２、５２の円筒本体の一端部〜中間部のみにモールドし、中間部〜他端部にモールドしないから、金型にセットされた遮蔽材４２、５２のインサートモールド時の放熱性をその中間部〜他端部で良好にし、結果として遮弊材４２、５２のこの部分での熱ひずみを極小にし、入力軸又は出力軸への圧入寸法精度を向上し、各コア４０、５０の組付性を向上する。   (h) The cores 40 and 50 are set in the mold because the magnetic materials 41 and 51 are molded only at one end to the middle portion of the cylindrical body of the shielding materials 42 and 52 and not from the middle to the other end. The heat shielding performance of the formed shielding materials 42 and 52 at the time of insert molding is improved at the intermediate portion to the other end portion, and as a result, the thermal strain at this portion of the shielding materials 42 and 52 is minimized, and the input shaft or the output shaft The press-fitting dimensional accuracy into the core is improved, and the assemblability of the cores 40 and 50 is improved.

(i)各コア４０、５０が互いに同一形状をなすことにより、各コア４０、５０を共通部品化できる。   (i) Since the cores 40 and 50 have the same shape, the cores 40 and 50 can be made into common parts.

(j)電動パワーステアリング装置１０のトルクセンサ３０において、上述(a)〜(i)を実現できる。これにより、ステアリングホイールに加えた操舵トルクの検出精度を向上し、電動モータによるアシスト性能を向上できる。   (j) In the torque sensor 30 of the electric power steering apparatus 10, the above (a) to (i) can be realized. Thereby, the detection accuracy of the steering torque applied to the steering wheel can be improved, and the assist performance by the electric motor can be improved.

以上、本発明の実施例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例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。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

図１は電動パワーステアリング装置の要部を示す断面図である。FIG. 1 is a cross-sectional view showing a main part of the electric power steering apparatus. 図２はトルクセンサを拡大して示す断面図である。FIG. 2 is an enlarged sectional view showing the torque sensor. 図３はヨークへのボビンのインサートモールド成形体を示す断面図である。FIG. 3 is a cross-sectional view showing an insert molding of a bobbin to a yoke. 図４は第１のコアと第２のコアを拡大して示す断面図である。FIG. 4 is an enlarged cross-sectional view of the first core and the second core. 図５はトルクセンサの模式図である。FIG. 5 is a schematic diagram of a torque sensor.

符号の説明Explanation of symbols

１０ 電動パワーステアリング装置
１１、１２ ハウジング
１４ 入力軸
１５ 出力軸
１６ トーションバー
３０ トルクセンサ
６０ トルク検出コイル
７０ 温度補償コイル
８０ ボビン
９０ ヨーク DESCRIPTION OF SYMBOLS 10 Electric power steering apparatus 11, 12 Housing 14 Input shaft 15 Output shaft 16 Torsion bar 30 Torque sensor 60 Torque detection coil 70 Temperature compensation coil 80 Bobbin 90 Yoke

Claims (4)

ハウジングに収容される入力軸と出力軸がトーションバーを介して連結され、
トルク検出コイルと温度補償コイルをハウジングに設けてなるトルクセンサにおいて、
トルク検出コイル用ボビンと温度補償コイル用ボビンを一体に樹脂成形してなることを特徴とするトルクセンサ。 The input shaft and output shaft housed in the housing are connected via a torsion bar,
In a torque sensor in which a torque detection coil and a temperature compensation coil are provided in a housing,
A torque sensor comprising a torque detection coil bobbin and a temperature compensation coil bobbin integrally molded with resin. 前記ボビンと、該ボビンに巻装したトルク検出コイル及び温度補償コイルを、磁性金属粉を混合した樹脂製ヨークでインサートモールドする請求項１に記載のトルクセンサ。   The torque sensor according to claim 1, wherein the bobbin, a torque detection coil and a temperature compensation coil wound around the bobbin are insert-molded with a resin yoke mixed with magnetic metal powder. 前記入力軸を支持する入力軸受と、前記ヨークを、樹脂製ハウジングでインサートモールドする請求項２に記載のトルクセンサ。   The torque sensor according to claim 2, wherein the input bearing that supports the input shaft and the yoke are insert-molded with a resin housing. ステアリングホイールが結合される入力軸と、電動モータに連動する出力軸とを有し、請求項１〜３のいずれかに記載のトルクセンサの検出トルクにより電動モータを駆動制御することを特徴とする電動パワーステアリング装置。   A drive shaft is controlled by the torque detected by the torque sensor according to any one of claims 1 to 3, wherein an input shaft to which a steering wheel is coupled and an output shaft linked to the electric motor are provided. Electric power steering device.
JP2005315291A 2005-10-28 2005-10-28 Torque sensor and electric power steering device Pending JP2007121162A (en)

Priority Applications (1)

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Publications (1)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63292029A (en) * 1987-05-26 1988-11-29 Koyo Seiko Co Ltd Torque sensor
JPH04191630A (en) * 1990-11-26 1992-07-09 Japan Electron Control Syst Co Ltd Magnetostriction type torque sensor
JPH10267770A (en) * 1997-03-25 1998-10-09 Honda Lock Mfg Co Ltd Torque detector
JP2003004555A (en) * 2001-06-18 2003-01-08 Aisin Seiki Co Ltd Magnetostrictive torque sensor and method of manufacturing the same
JP2004271380A (en) * 2003-03-10 2004-09-30 Aisin Seiki Co Ltd Method for measuring torque, torque-measuring device, and torque sensor device
JP2005195608A (en) * 2005-03-03 2005-07-21 Nsk Ltd Torque sensor
JP2005201690A (en) * 2004-01-13 2005-07-28 Koyo Seiko Co Ltd Torque detector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63292029A (en) * 1987-05-26 1988-11-29 Koyo Seiko Co Ltd Torque sensor
JPH04191630A (en) * 1990-11-26 1992-07-09 Japan Electron Control Syst Co Ltd Magnetostriction type torque sensor
JPH10267770A (en) * 1997-03-25 1998-10-09 Honda Lock Mfg Co Ltd Torque detector
JP2003004555A (en) * 2001-06-18 2003-01-08 Aisin Seiki Co Ltd Magnetostrictive torque sensor and method of manufacturing the same
JP2004271380A (en) * 2003-03-10 2004-09-30 Aisin Seiki Co Ltd Method for measuring torque, torque-measuring device, and torque sensor device
JP2005201690A (en) * 2004-01-13 2005-07-28 Koyo Seiko Co Ltd Torque detector
JP2005195608A (en) * 2005-03-03 2005-07-21 Nsk Ltd Torque sensor

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