JP5963189B2 - Rotation angle detector - Google Patents

Rotation angle detector Download PDF

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JP5963189B2
JP5963189B2 JP2012063469A JP2012063469A JP5963189B2 JP 5963189 B2 JP5963189 B2 JP 5963189B2 JP 2012063469 A JP2012063469 A JP 2012063469A JP 2012063469 A JP2012063469 A JP 2012063469A JP 5963189 B2 JP5963189 B2 JP 5963189B2
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magnet
rotation angle
screw member
rotor
angle detection
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JP2013195262A (en
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龍一 八重樫
龍一 八重樫
大沼　倫郎
倫郎 大沼
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Keihin Corp
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本発明は，回転軸に取り付けられてそれと共に回転する，磁石を有する回転子と，前記磁石と協働して前記回転軸の回転角度を磁電変換的に検出するよう前記回転子に対置される非回転の磁電変換素子とを備えてなる回転角度検出装置の改良に関する。   The present invention is a rotor having a magnet attached to and rotating with a rotating shaft, and is opposed to the rotor so as to detect the rotation angle of the rotating shaft in a magnetoelectric manner in cooperation with the magnet. The present invention relates to an improvement in a rotation angle detecting device including a non-rotating magnetoelectric conversion element.

かゝる回転角度検出装置は，例えば，エンジンのスロットル弁の開度検出に使用されるもので，特許文献１に開示されるように既に知られている。   Such a rotation angle detection device is used, for example, for detecting the opening of an engine throttle valve, and is already known as disclosed in Patent Document 1.

特許第４５０９０２５号公報Japanese Patent No. 45009025

特許文献１に記載された回転角度検出装置では，磁石を有する回転子は，ねじによって回転軸に固着されるので，ねじの頭部が回転子の上面より突出してしまい，その頭部が磁電変換素子の回転子への近接を妨げることになり，これが回転角度検出装置のコンパクト化の障害となる。   In the rotation angle detection device described in Patent Document 1, since the rotor having a magnet is fixed to the rotation shaft by a screw, the head of the screw protrudes from the upper surface of the rotor, and the head is magnetoelectrically converted. This hinders the proximity of the element to the rotor, which is an obstacle to the compactness of the rotation angle detector.

本発明は，かゝる事情に鑑みてなされたもので，回転子となる磁石を回転軸へ容易にねじ止めすることができ，しかもねじの頭部に干渉されることなく，磁電変換素子の磁石への近接配置を可能にしたコンパクトな前記回転角度検出装置を提供することを目的とする。   The present invention has been made in view of such circumstances. A magnet serving as a rotor can be easily screwed to a rotating shaft, and the magnetoelectric conversion element is not interfered with by the screw head. It is an object of the present invention to provide a compact rotation angle detection device that can be arranged close to a magnet.

上記目的を達成するために，本発明は，スロットル弁の回転軸に取り付けられてそれと共に回転する回転子と，該回転子が有する磁石と協働して前記回転軸の回転角度を磁電変換的に検出するよう前記回転子に対置される非回転の磁電変換素子とを備えてなる回転角度検出装置において，前記回転子は，非磁性材料のねじ部材と，合成樹脂製の前記磁石とからなり，前記磁石は，前記ねじ部材の頭部外周に，環状にモールド成形されて前記ねじ部材と一体化された合成樹脂からなり，前記ねじ部材が前記回転軸に同軸状に螺合締結されることで回転子が回転軸に取り付けられていることを第１の特徴とする。 To achieve the above object, the present invention provides a magnetoelectric and times rotor you rotation therewith mounted on the rotary shaft of the throttle valve, the rotational angle of the rotating shaft in cooperation with the magnet to which the rotor has In the rotation angle detecting device comprising a non-rotating magnetoelectric conversion element opposed to the rotor for conversion detection, the rotor includes a screw member made of a non-magnetic material, the magnet made of synthetic resin, The magnet is formed of a synthetic resin that is molded annularly and integrated with the screw member on the outer periphery of the head of the screw member, and the screw member is screwed and fastened coaxially to the rotation shaft. Thus , the first feature is that the rotor is attached to the rotating shaft .

また本発明は，第１の特徴に加えて，前記ねじ部材の前記頭部が有する工具係合溝の一部に前記磁石の一部が食い込むことにより，工具係合溝に工具係合の機能を残したまま，前記磁石と前記ねじ部材とが一体化されていることを第２の特徴とする。 The present invention, in addition to the first feature, by the the bite write Mukoto part of the magnet to a portion of the tool engagement groove in which the head has the threaded member, the tool engages the tool engagement groove The second feature is that the magnet and the screw member are integrated while maintaining the above function .

また本発明は，第１または第２の特徴に加えて，前記頭部の外周に環状のアンカ突起が形成され，該アンカ突起が前記磁石の内周面に食い込んで一体化されていることを第３の特徴とする。According to the present invention, in addition to the first or second feature, an annular anchor protrusion is formed on the outer periphery of the head, and the anchor protrusion is integrated into the inner peripheral surface of the magnet. The third feature.

また本発明は，第１−３のいずれかの特徴に加えて，前記磁石が，前記スロットル弁の取り付け位置を基準とした所定の直径線上にＮ，Ｓ極が来るように着磁されていることを第４の特徴とする。According to the present invention, in addition to any one of the first to third features, the magnet is magnetized so that N and S poles are located on a predetermined diameter line with respect to a position where the throttle valve is attached. This is the fourth feature.

また本発明は，第１−４のいずれかの特徴に加えて，前記磁電変換素子は，検出角度を９０°ずらした一対の磁電変換素子と，この一対の磁電変換素子から得られる出力電圧を前記磁石の回転角度の変化に比例する出力電圧にするリニアライザ部とからなり，３６０°にわたる前記磁石の回転角度の変化に比例する出力電圧を出力可能とされていることを第５の特徴とする。According to the present invention, in addition to any one of the first to fourth features, the magnetoelectric conversion element includes a pair of magnetoelectric conversion elements whose detection angles are shifted by 90 °, and an output voltage obtained from the pair of magnetoelectric conversion elements. A fifth feature is that it comprises a linearizer unit that makes an output voltage proportional to a change in the rotation angle of the magnet, and is capable of outputting an output voltage proportional to the change in the rotation angle of the magnet over 360 °. .

本発明の第１の特徴によれば，スロットル弁の回転軸にそれと同軸状に螺合締結される，非磁性材料製のねじ部材と，このねじ部材の頭部外周にモールド成形される合成樹脂製の磁石とで回転子を構成したことで，ねじ部材の頭部に干渉されることなく，磁電変換素子を磁石に近接配置することが可能となり，回転角度検出装置のコンパクト化を図ることができる。またねじ部材は非磁性材料で構成されるので，磁石による回転軸の磁化がねじ部材によって防ぐことができる。またねじ部材及び磁石は一体不可分の単一部品となり，ねじ部材を回転軸に螺合緊締するだけで磁石を定位置に連結することができ，その取り付けが容易になると共に，分解時には，ねじ部材等の紛失を防ぐことができる。 According to the first aspect of the present invention, a screw member made of a non-magnetic material, which is screwed and fastened coaxially with the rotary shaft of the throttle valve, and a synthetic resin molded on the outer periphery of the head of the screw member By constructing the rotor with magnets made of magnets, the magnetoelectric transducer can be placed close to the magnet without interference with the head of the screw member, and the rotation angle detector can be made compact. it can. Further, since the screw member is made of a non-magnetic material, magnetization of the rotating shaft by the magnet can be prevented by the screw member. The screw member and magnet are inseparable single parts, and the screw can be connected to a fixed position simply by screwing and tightening the screw member to the rotating shaft. Etc. can be prevented.

本発明の第２の特徴によれば，ねじ部材の頭部が有する工具係合溝の一部に磁石の一部を食い込ませたので，工具係合溝が磁石の一部を食い込ませるアンカ溝の役割を果たすことになり，簡単な構造により，工具係合溝に工具係合の機能を残したまま，ねじ部材の頭部と磁石との結合強度を強化することができる。 According to the second feature of the present invention, since a part of the magnet is bitten into a part of the tool engaging groove of the head of the screw member, the tool engaging groove bites a part of the magnet. With a simple structure, it is possible to reinforce the coupling strength between the head of the screw member and the magnet while leaving the tool engagement function in the tool engagement groove .

本発明の第１実施形態に係る回転角度検出装置の縦断面図。The longitudinal cross-sectional view of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention. 図１中の磁電変換素子の出力信号特性図。The output signal characteristic view of the magnetoelectric conversion element in FIG. 本発明の第２実施形態に係る回転角度検出装置の縦断面図。The longitudinal cross-sectional view of the rotation angle detection apparatus which concerns on 2nd Embodiment of this invention. 図３中の集積磁電変換素子の出力信号特性図。The output signal characteristic view of the integrated magnetoelectric conversion element in FIG.

本発明の実施の形態を，添付図面に基づいて以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１及び図２に示す本発明の第１実施形態の説明より始める。先ず図１において，符号１は，エンジンの吸気系の一部を構成するスロットルボディであり，内部にエンジンの吸気ポート（図示せず）に連通する吸気道１ａを有する。このスロットルボディ１には，吸気道１ａを横断するように配置される回転軸２が回転自在に支承され，この回転軸２に，吸気道１ａを開閉するバタフライ型のスロットル弁３がねじ止めされる。回転軸２の一端部には，これをマニュアル操作するためのスロットルレバー又は自動操作するための電動モータ（何れも図示せず。）が連結され，その他端部には，スロットル弁３の開度を検出する本発明の回転角度検出装置５が接続される。   The description starts with the description of the first embodiment of the present invention shown in FIGS. First, in FIG. 1, reference numeral 1 denotes a throttle body constituting a part of an intake system of an engine, and has an intake passage 1a communicating with an intake port (not shown) of the engine inside. A rotary shaft 2 disposed so as to cross the intake passage 1a is rotatably supported on the throttle body 1, and a butterfly throttle valve 3 for opening and closing the intake passage 1a is screwed to the rotary shaft 2. The A throttle lever for manually operating the rotary shaft 2 or an electric motor (not shown) for automatic operation is connected to one end of the rotary shaft 2, and the opening of the throttle valve 3 is connected to the other end. The rotation angle detecting device 5 of the present invention for detecting the above is connected.

この回転角度検出装置５について，図１〜図３により詳細に説明する。   The rotation angle detection device 5 will be described in detail with reference to FIGS.

スロットルボディ１の両側面には，吸気道１ａの半径方向外方に突出する一対の円筒状の軸受ボス６（図には，その一方のみ示す。）が形成され，その軸受ボス６の軸受孔６ａによって前記回転軸２が回転自在に支持される。回転軸２には，軸受ボス６の内周面に密接させるシール部材７を装着する環状のシール溝８が形成されている。また軸受ボス６の端面には，軸受孔６ａと同軸で，それより大径の環状凹部９が形成されており，この環状凹部９の底面に当接する止環１０が回転軸２に係止され，これにより回転軸２の軸方向位置が規制される。   A pair of cylindrical bearing bosses 6 (only one of them is shown in the figure) projecting outward in the radial direction of the intake passage 1 a are formed on both side surfaces of the throttle body 1. The rotary shaft 2 is rotatably supported by 6a. The rotary shaft 2 is formed with an annular seal groove 8 in which a seal member 7 to be brought into close contact with the inner peripheral surface of the bearing boss 6 is mounted. An end surface of the bearing boss 6 is formed with an annular recess 9 that is coaxial with the bearing hole 6a and has a larger diameter. A retaining ring 10 that contacts the bottom surface of the annular recess 9 is engaged with the rotary shaft 2. This restricts the axial position of the rotating shaft 2.

回転角度検出装置５は，回転軸２の端部にねじ止めされる回転子１２と，軸受ボス６に取り付けられる磁電変換ユニット１３とよりなっている。   The rotation angle detection device 5 includes a rotor 12 that is screwed to the end of the rotating shaft 2 and a magnetoelectric conversion unit 13 that is attached to the bearing boss 6.

回転子１２は，回転軸２の一端面に開口するねじ孔１４にそれと同軸状に螺合緊締される非磁性材料製のねじ部材１５と，合成樹脂製の磁石１６とからなり，磁石１６は，このねじ部材１５の頭部１５ａ外周にモールド成形することにより一体化したものであり，その磁石１６は，回転軸２と同軸の環状をなしており，その磁石１６は，その頂面がねじ部材１５の頭部１５ａの頂面と略同一高さになるように配置される。またねじ部材１５の頭部１５ａの頂面には，ドライバ用の工具係合溝１７が形成されており，磁石１６のモールド成形時，この工具係合溝１７の一部に前記磁石１６の一部が食い込ませてある。また前記頭部１５ａの外周には環状のアンカ突起１８が形成されており，それが環状の磁石１６の内周面に食い込ませてある。これらによってねじ部材１５の頭部１５ａと磁石１６との結合強度が強化される。したがって，工具係合溝１７は，ドライバ用の工具係合の機能を残したまま頭部１５ａと磁石１６との結合強度を強化するアンカ溝の役割を果たす。 The rotor 12 includes a screw member 15 made of a nonmagnetic material that is screwed and tightened coaxially with a screw hole 14 that opens to one end surface of the rotary shaft 2, and a magnet 16 made of synthetic resin. is obtained by integrating by molding the head 15a outer periphery of the screw member 15, its magnets 16 is formed in a rotary shaft 2 coaxial annular, the magnet 16, its top surface It arrange | positions so that it may become substantially the same height as the top surface of the head 15a of the screw member 15. FIG. Further, a tool engagement groove 17 for a driver is formed on the top surface of the head portion 15a of the screw member 15. When the magnet 16 is molded, a part of the magnet 16 is formed in a part of the tool engagement groove 17. part is Ru Oh so bite. An annular anchor protrusion 18 is formed on the outer periphery of the head portion 15a, and bites into the inner peripheral surface of the annular magnet 16. As a result, the coupling strength between the head 15a of the screw member 15 and the magnet 16 is enhanced. Therefore, the tool engagement groove 17 serves as an anchor groove that reinforces the coupling strength between the head portion 15a and the magnet 16 while leaving the function of the tool engagement for the driver .

ねじ部材１５を構成する非磁性材料としては，例えばアルミニュームが好適である。また合成樹脂製の磁石１６は，磁性粉末をゴムやプラスチック等のバインダ材と混合してなるもので，ねじ部材１５の頭部１５ａ外周にモールド成形した後，ねじ部材１５を回転軸２に螺合，緊締してから，回転軸２おけるスロットル弁３の取り付け位置を基準にしてＮ，Ｓ極が所定の直径線上に来るように着磁される。   As the nonmagnetic material constituting the screw member 15, for example, aluminum is suitable. The synthetic resin magnet 16 is formed by mixing magnetic powder with a binder material such as rubber or plastic. After molding on the outer periphery of the head 15a of the screw member 15, the screw member 15 is screwed onto the rotary shaft 2. In this case, after tightening, the N and S poles are magnetized so as to be on a predetermined diameter line with reference to the mounting position of the throttle valve 3 on the rotary shaft 2.

磁電変換ユニット１３は，絶縁性合成樹脂製で円筒状のパッケージ２０と，このパッケージに，その外周面より突出するように一体成形されるカプラ２１と，パッケージ２０の中心部に埋設される磁電変換素子２２と，これら素子の出力信号を外部に取り出すべくカプラ２１に保持される複数の信号端子２３とよりなっており，磁電変換素子２２には，例えばホール素子が使用される。   The magnetoelectric conversion unit 13 includes a cylindrical package 20 made of an insulating synthetic resin, a coupler 21 integrally formed so as to protrude from the outer peripheral surface of the package, and a magnetoelectric conversion embedded in the center of the package 20. The element 22 and a plurality of signal terminals 23 held by the coupler 21 for taking out the output signals of these elements to the outside are composed of a Hall element.

円筒状のパッケージ２０の内端面には，前記回転子１２を無接触で収容し得る円筒状の収容凹部２５と，この収容凹部２５を囲むようにして突出する位置決め筒部２６と，この位置決め筒部２６を囲繞しながらシール部材１９を装着する環状のシール溝２４とが形成され，またパッケージ２０の外周面には複数の耳部２７（図には，その一つのみを示す。）が一体に突設される。而して，収容凹部２５に回転子１２を収めながら位置決め筒部２６を軸受ボス６の環状凹部９の内周面に嵌合し，シール部材１９を軸受ボス６の端面に密接させた状態で，耳部２７のボルト孔２８に挿通したボルト２９を，軸受ボス６の端面の所定位置に開口するねじ孔３０に螺合緊締する。こうして，パッケージ２０は，軸受ボス６の端面上の所定定位置に取り付けられる。この取り付け状態において，磁電変換素子２２は，回転子１２の磁石１６の磁界に配置される。   On the inner end surface of the cylindrical package 20, a cylindrical accommodation recess 25 that can accommodate the rotor 12 without contact, a positioning cylinder portion 26 that projects so as to surround the accommodation recess 25, and the positioning cylinder portion 26. An annular seal groove 24 for mounting the seal member 19 is formed while surrounding the housing 20, and a plurality of ears 27 (only one of which is shown in the figure) protrudes integrally on the outer peripheral surface of the package 20. Established. Thus, the positioning cylinder portion 26 is fitted to the inner peripheral surface of the annular recess 9 of the bearing boss 6 while the rotor 12 is housed in the receiving recess 25, and the seal member 19 is in close contact with the end surface of the bearing boss 6. The bolt 29 inserted into the bolt hole 28 of the ear 27 is screwed and tightened into the screw hole 30 opened at a predetermined position on the end surface of the bearing boss 6. Thus, the package 20 is attached to a predetermined fixed position on the end face of the bearing boss 6. In this attached state, the magnetoelectric conversion element 22 is disposed in the magnetic field of the magnet 16 of the rotor 12.

而して，スロットル弁３，即ち回転軸２が回転すると，それと共に磁石１６を備えた回転子１２が回転し，磁電変換素子２２周りの磁石１６の磁界の方向が変化すると，磁電変換素子２２が感受する磁気量が変化するので，磁電変換素子２２は，その磁気量に応じた電圧信号を発生し，その電圧信号が，信号端子２３に接続される電子制御ユニットに出力され，そこでスロットル弁３の開度に演算され，そのデータは，回転軸２を駆動する電動モータや，エンジンの燃料噴射量，点火時期等の制御に利用される。   Thus, when the throttle valve 3, that is, the rotary shaft 2 rotates, the rotor 12 having the magnet 16 rotates with it, and when the direction of the magnetic field of the magnet 16 around the magnetoelectric conversion element 22 changes, the magnetoelectric conversion element 22. Therefore, the magnetoelectric transducer 22 generates a voltage signal corresponding to the amount of magnetism, and the voltage signal is output to the electronic control unit connected to the signal terminal 23, where the throttle valve 3 is used for controlling the electric motor that drives the rotary shaft 2, the fuel injection amount of the engine, the ignition timing, and the like.

このような回転角度検出装置５において，回転子１２は，回転軸２にそれと同軸状に螺合締結される，非磁性材料製のねじ部材１５と，このねじ部材１５の頭部１５ａ外周にモールド成形される合成樹脂製の磁石１６とで構成されるので，ねじ部材１５及び磁石１６は一体不可分の単一部品となり，ねじ部材１５を回転軸２に螺合緊締するだけで磁石１６を定位置に連結することができ，その取り付けが容易になると共に，分解時には，ねじ部材１５等の紛失を防ぐことができる。しかも，磁石１６の頂面からねじ部材１５の頭部１５ａが突出しないようにできるので，ねじ部材１５の頭部１５ａに干渉されることなく，磁電変換素子２２及びそれを埋設するパッケージ２０を磁石１６に近接することが可能となり，回転角度検出装置５のコンパクト化を図ることができる。またねじ部材１５は非磁性材料で構成されるので，磁石１６による回転軸２の磁化がねじ部材１５によって防ぐことができる。   In such a rotation angle detection device 5, the rotor 12 has a screw member 15 made of a non-magnetic material that is screwed and fastened to the rotary shaft 2 coaxially therewith, and a mold is formed on the outer periphery of the head portion 15 a of the screw member 15. Since it is composed of a synthetic resin magnet 16 to be molded, the screw member 15 and the magnet 16 become inseparable single parts, and the magnet 16 is fixed in position only by screwing and tightening the screw member 15 to the rotary shaft 2. Can be connected to each other, and the attachment can be facilitated, and at the time of disassembly, the screw member 15 and the like can be prevented from being lost. Moreover, since the head portion 15a of the screw member 15 does not protrude from the top surface of the magnet 16, the magnetoelectric transducer 22 and the package 20 in which it is embedded can be magnetized without being interfered with the head portion 15a of the screw member 15. 16 and the rotation angle detector 5 can be made compact. Further, since the screw member 15 is made of a nonmagnetic material, the screw member 15 can prevent magnetization of the rotating shaft 2 by the magnet 16.

ところで，図２（Ａ）に示すように，磁電変換素子２２の出力電圧は，磁石１６の回転角度の変化に応じて正弦波を描くように変化するので，スロットル弁３の全閉から全開に至る９０°未満の検出領域では，図２（Ｂ）に示すように，磁電変換素子２２の出力電圧のリニアライズされたものがスロットル弁３の開度増加に比例することが要求される。そこで，スロットル弁３の全閉から全開に至る９０°未満の検出領域を上記正弦波の上り勾配領域ａ又は下り勾配領域ｂに対応させるべく，回転子１２の回転軸２への取り付け後，回転軸２におけるスロットル弁３の取り付け位置を基準にして，磁石１６の素材に，その所定の直径線上にＮ，Ｓ極が来るように着磁する。 By the way, as shown in FIG. 2A, the output voltage of the magnetoelectric conversion element 22 changes so as to draw a sine wave in accordance with the change of the rotation angle of the magnet 16, so that the throttle valve 3 is fully opened from fully closed. In the detection region of less than 90 °, the linearized output voltage of the magnetoelectric transducer 22 is required to be proportional to the increase in the opening of the throttle valve 3 as shown in FIG. Therefore, after the rotor 12 is attached to the rotary shaft 2 in order to make the detection region of less than 90 ° from the fully closed to fully open throttle valve 3 correspond to the upward gradient region a or the downward gradient region b of the sine wave, Using the attachment position of the throttle valve 3 on the shaft 2 as a reference, the material of the magnet 16 is magnetized so that the N and S poles are on the predetermined diameter line.

次に，図３及び図４に示す本発明の第２実施形態について説明する。   Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described.

この第２実施形態は，図３に示すように，回転子１２において，磁石１６を，その頂面がねじ部材１５の頭部１５ａの頂面より高くなるように形成して，頭部１５ａの上方に磁石１６に囲まれる空所３１を形成し，この空所３１に集積磁電変換素子２２′が配置されるようにパッケージ２０は形成される。   In the second embodiment, as shown in FIG. 3, in the rotor 12, the magnet 16 is formed so that the top surface thereof is higher than the top surface of the head portion 15a of the screw member 15. A space 31 surrounded by the magnet 16 is formed above, and the package 20 is formed so that the integrated magnetoelectric conversion element 22 ′ is disposed in the space 31.

上記集積磁電変換素子２２′は，それぞれの検出軸を９０°ずらした一対の磁電変換素子と，この両磁電変換素子から得られる出力電圧を磁石１６の回転角度の変化に比例する出力電圧にするリニアライザ部（図示せず）とを備えている。この集積磁電変換素子２２′における一対の磁電変換素子から得られる正弦波形の出力電圧Ｘ，Ｙは，図４（Ａ）に示すように，互いに９０°ずれており，これら出力電圧Ｘ，Ｙが前記リニアライザ部に入力され，そのリニアライザ部は，上記電圧Ｘ，Ｙに基づいて，図４（Ｂ）に示すように，３６０°にわたり磁石１６の回転角度の変化に比例する出力電圧を出力する。尚，その他の構成は，前記第１実施形態と同様であるので，図３中，第１実施形態と対応する部分には同一の参照符号を付して，重複する説明を省略する。   The integrated magnetoelectric conversion element 22 ′ has a pair of magnetoelectric conversion elements whose detection axes are shifted by 90 °, and an output voltage obtained from both the magnetoelectric conversion elements is set to an output voltage proportional to a change in the rotation angle of the magnet 16. And a linearizer unit (not shown). The sinusoidal output voltages X and Y obtained from the pair of magnetoelectric conversion elements in the integrated magnetoelectric conversion element 22 'are shifted by 90 ° from each other as shown in FIG. Based on the voltages X and Y, the linearizer unit outputs an output voltage proportional to a change in the rotation angle of the magnet 16 over 360 °, as shown in FIG. 4B. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG.

この第２実施形態によれば，集積磁電変換素子２２′が磁石１６に囲繞され，その磁界の安定した箇所に配置されることになり，集積磁電変換素子２２′から安定した電圧信号を取り出すことができる。しかもその出力電圧を磁石１６の回転角度を３６０°にわたり希望通り検出し得るから，前記第１実施形態のように，スロットル弁３の全閉から全開に至る検出領域を集積磁電変換素子２２′の正弦波の上り又は下り勾配領域に対応させるべく磁石２のＮ，Ｓ極が回転軸２の所定の所定の直径線上に来るように磁石２の素材に着磁するといった必要がなくなり，スロットル弁３を支持する回転軸２に回転子１２を，またスロットルボディ１に磁電変換ユニット１３をそれぞれ取り付ける作業が極めて簡単なものとなる。さらに，ねじ部材１５の頭部１５ａに干渉されることなく，磁石１６及び集積磁電変換素子２２′が相互に近接することで，第１実施形態と同様に回転角度検出装置５のコンパクト化を図ることができる。   According to the second embodiment, the integrated magnetoelectric conversion element 22 ′ is surrounded by the magnet 16 and is disposed at a position where the magnetic field is stable, and a stable voltage signal is extracted from the integrated magnetoelectric conversion element 22 ′. Can do. In addition, since the output voltage can be detected as desired over the rotation angle of the magnet 16 over 360 °, the detection region from the fully closed to fully opened throttle valve 3 is set in the integrated magnetoelectric transducer 22 ′ as in the first embodiment. There is no need to magnetize the material of the magnet 2 so that the N and S poles of the magnet 2 are on a predetermined diameter line of the rotating shaft 2 so as to correspond to the up or down gradient region of the sine wave. The operation of attaching the rotor 12 to the rotary shaft 2 that supports the motor and the magnetoelectric conversion unit 13 to the throttle body 1 becomes extremely simple. Further, the magnet 16 and the integrated magnetoelectric transducer 22 ′ are close to each other without being interfered with the head 15a of the screw member 15, so that the rotation angle detection device 5 can be made compact as in the first embodiment. be able to.

本発明は上記実施形態に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。   The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention.

２・・・・・回転軸
１２・・・・回転子
１５・・・・ねじ部材
１５ａ・・・頭部
１６・・・・磁石
１７・・・・工具係合溝
２２・・・・磁電変換素子
２２′・・・磁電変換素子（集積磁電変換素子）
2... Rotating shaft 12... Rotor 15... Screw member 15 a... Head 16. Element 22 '... Magnetoelectric conversion element (integrated magnetoelectric conversion element)

Claims (5)

スロットル弁（３）の回転軸（２）に取り付けられてそれと共に回転する回転子（１２）と，該回転子（１２）が有する磁石（１６）と協働して前記回転軸（２）の回転角度を磁電変換的に検出するよう前記回転子（１２）に対置される非回転の磁電変換素子（２２，２２′）とを備えてなる回転角度検出装置において，
前記回転子（１２）は，非磁性材料のねじ部材（１５）と，合成樹脂製の前記磁石（１６）とからなり，前記磁石（１６）は，前記ねじ部材（１５）の頭部（１５ａ）外周に，環状にモールド成形されて前記ねじ部材（１５）と一体化された合成樹脂からなり，前記ねじ部材（１５）が前記回転軸（２）に同軸状に螺合締結されることで回転子（１２）が回転軸（２）に取り付けられていることを特徴とする回転角度検出装置。 And you rotate rotating rotor mounted therewith to a rotating shaft (2) of the throttle valve (3) (12), said rotary shaft in cooperation with the magnet (16) to which the rotor (12) has (2 And a non-rotating magnetoelectric conversion element (22, 22 ') opposed to the rotor (12) so as to detect the rotation angle in a magnetoelectric conversion manner.
The rotor (12) includes a screw member (15) made of a non-magnetic material and the magnet (16) made of synthetic resin, and the magnet (16) is a head (15a) of the screw member (15). ) The outer periphery is made of a synthetic resin which is molded in an annular shape and integrated with the screw member (15), and the screw member (15) is screwed and fastened coaxially to the rotating shaft (2). A rotation angle detection device characterized in that a rotor (12) is attached to a rotation shaft (2) . 請求項１記載の回転角度検出装置において，
前記ねじ部材（１５）の前記頭部（１５ａ）が有する工具係合溝（１７）の一部に前記磁石（１６）の一部が食い込むことにより，工具係合溝（１７）に工具係合の機能を残したまま，前記磁石（１６）と前記ねじ部材（１５）とが一体化されていることを特徴とする回転角度検出装置。 The rotation angle detection device according to claim 1,
By the screw member (15) said head (15a) is a tool engagement groove (17) of the part of eating write Mukoto of the part magnet (16) having the tool to the tool engagement groove (17) The rotation angle detection device characterized in that the magnet (16) and the screw member (15) are integrated while leaving the function of engagement . 請求項１または請求項２記載の回転角度検出装置において，In the rotation angle detection device according to claim 1 or 2,
前記頭部（１５ａ）の外周に環状のアンカ突起（１８）が形成され，該アンカ突起（１８）が前記磁石（１６）の内周面に食い込んで一体化されていることを特徴とする回転角度検出装置。An annular anchor protrusion (18) is formed on the outer periphery of the head (15a), and the anchor protrusion (18) bites into the inner peripheral surface of the magnet (16) and is integrated. Angle detection device. 請求項１−３のいずれかに記載の回転角度検出装置において，In the rotation angle detection apparatus in any one of Claims 1-3,
前記磁石（１６）が，前記スロットル弁（３）の取り付け位置を基準とした所定の直径線上にＮ，Ｓ極が来るように着磁されていることを特徴とする回転角度検出装置。The rotation angle detecting device according to claim 1, wherein the magnet (16) is magnetized so that N and S poles are located on a predetermined diameter line with reference to a mounting position of the throttle valve (3). 請求項１−４のいずれかに記載の回転角度検出装置において，In the rotation angle detection apparatus in any one of Claims 1-4,
前記磁電変換素子（２２′）は，検出角度を９０°ずらした一対の磁電変換素子と，この一対の磁電変換素子から得られる出力電圧を前記磁石（１６）の回転角度の変化に比例する出力電圧にするリニアライザ部とからなり，３６０°にわたる前記磁石（１６）の回転角度の変化に比例する出力電圧を出力可能とされていることを特徴とする回転角度検出装置。The magnetoelectric conversion element (22 ′) has a pair of magnetoelectric conversion elements with detection angles shifted by 90 °, and an output voltage obtained from the pair of magnetoelectric conversion elements is proportional to the change in the rotation angle of the magnet (16). A rotation angle detection device comprising a linearizer for converting voltage into an output voltage proportional to a change in rotation angle of the magnet (16) over 360 °.
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