JP6626476B2 - Rotation angle detection device using gear support mechanism to hold gear in proper position - Google Patents

Rotation angle detection device using gear support mechanism to hold gear in proper position Download PDF

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JP6626476B2
JP6626476B2 JP2017137283A JP2017137283A JP6626476B2 JP 6626476 B2 JP6626476 B2 JP 6626476B2 JP 2017137283 A JP2017137283 A JP 2017137283A JP 2017137283 A JP2017137283 A JP 2017137283A JP 6626476 B2 JP6626476 B2 JP 6626476B2
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gear
rotation
shaft
rotation angle
housing
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徳行 根岸
徳行 根岸
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Oriental Motor Co Ltd
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Description

本発明は、回転角検出装置に使用される歯車を支持する機構に関し、さらに詳しくは、歯車を適正な位置に保持する歯車支持機構を用いる回転角検出装置に関する。   The present invention relates to a mechanism for supporting a gear used in a rotation angle detecting device, and more particularly, to a rotation angle detecting device using a gear supporting mechanism for holding a gear at an appropriate position.

歯車の回転を正確に検出するためには、歯車を取り付ける軸が歯車の回転に対して安定していることが必須である。軸の安定性を確保するために、特開２０１２−１４５３８０号公報（特許文献１）に開示された多回転アブソリュート回転角検出装置は、図２に示されるように、歯車２４ａ，ｂ、２５ａ，ｂ、２６ａ，ｂをそれぞれ固定した第２〜４回転軸２４〜２６を保持するための保持板３２を用いる。この保持板３２により、第２〜４回転軸２４〜２６の中心軸は、歯車２４ａ，ｂ、２５ａ，ｂ、２６ａ，ｂの回転に対して、ぶれないで安定する。   In order to accurately detect the rotation of the gear, it is essential that the shaft on which the gear is mounted is stable with respect to the rotation of the gear. In order to secure the stability of the shaft, a multi-rotation absolute rotation angle detection device disclosed in Japanese Patent Application Laid-Open No. 2012-145380 (Patent Document 1), as shown in FIG. A holding plate 32 for holding the second to fourth rotation shafts 24 to 26 to which b, 26a, and b are respectively fixed is used. By the holding plate 32, the central axes of the second to fourth rotation shafts 24 to 26 are stabilized without rotation against rotation of the gears 24a, b, 25a, b, 26a, b.

また、特開２００４−３５４０７５号公報（特許文献２）に開示された回転角度検出装置１は、回路基板２と下ケース１０とで樹脂製の第２のギア３を挟持する構造を開示する。   Further, the rotation angle detection device 1 disclosed in Japanese Patent Application Laid-Open No. 2004-354075 (Patent Document 2) discloses a structure in which a second gear 3 made of resin is sandwiched between a circuit board 2 and a lower case 10.

さらに、特開２０１３−１５２０９２号公報（特許文献３）は、歯車３０１に従属する歯車３０２，３０３が軸受３０３，３０４でそれぞれ軸支される多回転モジュールを開示し、この構造によれば、軸受３０３，３０４による１点で歯車を支持、かつ保持する。   Further, Japanese Patent Application Laid-Open No. 2013-152092 (Patent Document 3) discloses a multi-rotation module in which gears 302 and 303 subordinate to a gear 301 are supported by bearings 303 and 304, respectively. The gear is supported and held at one point by 303 and 304.

特開２０１２−１４５３８０号公報JP 2012-145380 A 特開２００４−３５４０７５号公報JP-A-2004-354075 特開２０１３−１５２０９２号公報JP 2013-152092 A

特許文献１の図２に示される構造の場合、歯車の回転軸を両端で保持する部品はそれぞれ別の部品となるため、組立の際に歯車軸受部の同軸度精度を維持することが難しく、回転軸を保持するための保持板が必要となる。   In the case of the structure shown in FIG. 2 of Patent Document 1, the components that hold the rotating shaft of the gear at both ends are separate components, so it is difficult to maintain the coaxiality accuracy of the gear bearing during assembly. A holding plate for holding the rotating shaft is required.

特許文献２の図１に示される構造は、車両のステアリング舵角を検出する回転角度検出装置に用いられるので、歯車の回転速度が低いため、回転角度の検出精度に問題となることはない。しかしながら、歯車が高速回転する場合は、樹脂歯車を樹脂材料で保持した場合、摺動部の摺動速度が高くなると摩擦熱により樹脂材料の溶融が発生する。このため、高速回転用途にはこの構造は適用できない。それを防ぐために歯車を金属製にする対策が考えられるが、金属で同じ形状の歯車を作製した場合、コストが高くなる。また、金属歯車は導体であるため、摩耗粉により回路基板上で回路短絡が発生する危険性がある。   The structure shown in FIG. 1 of Patent Document 2 is used for a rotation angle detection device that detects a steering angle of a vehicle, and therefore has a low rotation speed of a gear, so that there is no problem in the detection accuracy of the rotation angle. However, when the gear rotates at high speed, when the resin gear is held by the resin material, when the sliding speed of the sliding portion increases, the resin material is melted by frictional heat. For this reason, this structure cannot be applied to high-speed rotation applications. To prevent this, a countermeasure to make the gears made of metal is conceivable. However, if gears of the same shape are made of metal, the cost increases. Further, since the metal gear is a conductor, there is a risk that a short circuit may occur on the circuit board due to abrasion powder.

特許文献３の図４のような構造の場合、歯車を軸方向に固定するためにベース部品に固定された軸受に歯車を固定する必要がある。そのため、使用する軸受は深溝玉軸受のようにベース部品に固定される部品（外輪）と歯車と固定される部品（内輪）とに分かれた部品を持つ軸受を使用する必要がある。深溝玉軸受等を使用するためコストを抑えることが難しくなる。また、軸受け内部隙間等の影響で歯車軸が傾くことで、歯車のかみ合いが適正に行えない状態となるとか、歯車に設置した磁石の位置が半径方向にずれるため、センサ検出精度に影響することが考えられる。   In the case of the structure shown in FIG. 4 of Patent Document 3, it is necessary to fix the gear to a bearing fixed to the base component in order to fix the gear in the axial direction. Therefore, it is necessary to use a bearing such as a deep groove ball bearing, which has parts separated into a part (outer ring) fixed to the base part and a part (inner ring) fixed to the gear, such as a deep groove ball bearing. Since a deep groove ball bearing or the like is used, it is difficult to reduce costs. Also, if the gear shaft is tilted due to the effect of the bearing internal clearance, etc., it will not be possible to properly engage the gear, or the position of the magnet installed on the gear will shift in the radial direction, affecting the sensor detection accuracy. Can be considered.

本発明は、このような従来の課題に着目してなされたもので、主回転軸の回転角を検出するための歯車機構を構成する歯車を、歯車機構を収容する筐体に固定された歯車軸で保持するととともに筐体の２面で挟持する構成とし、また、歯車を面で挟持する部分については、筐体の一部としての回路基板を使用する。また、歯車には樹脂材料を使用し、歯車軸には金属軸を使用する。歯車は回路基板と回転可能に直接接する。さらに、歯車の端面が、内蔵した磁石の端面より適正量だけ突出しており、その突出量で磁石と、磁気検出素子との間隔を適正に保ち、かつ、磁石と回路基板が直接摺動することを防ぐ構造とすることにより、上記の課題を解決することができる。以下、本発明を図面に基づいて説明する。   The present invention has been made in view of such a conventional problem, and a gear that constitutes a gear mechanism for detecting a rotation angle of a main rotation shaft is fixed to a housing that houses the gear mechanism. It is configured to be held by the shaft and held between two surfaces of the housing, and a circuit board as a part of the housing is used for a portion where the gear is held between the surfaces. Further, a resin material is used for the gear, and a metal shaft is used for the gear shaft. The gear is rotatably in direct contact with the circuit board. In addition, the end face of the gear protrudes by an appropriate amount from the end face of the built-in magnet, and the distance between the magnet and the magnetic detection element is appropriately maintained by the amount of protrusion, and the magnet and the circuit board slide directly. The above problem can be solved by adopting a structure that prevents the above. Hereinafter, the present invention will be described with reference to the drawings.

本発明によれば、歯車と筐体を異種の材料で作製することにより、筐体に対する歯車の摺動性を高めることができるとともに、高速回転に適応させることができる。また、歯車を回路基板および筐体に直接接触させて回転することができることから、部品点数を削減した歯車機構を実現することができ、安価で小型の回転角検出装置を実現することが可能となるとともに、歯車内に発生した摩擦熱を歯車軸から筐体に伝導させ、歯車の溶融を防ぐことができる。 ADVANTAGE OF THE INVENTION According to this invention, the slidability of the gear with respect to a housing | casing can be improved by producing a gear and a housing | casing from a different material, and it can be adapted to high-speed rotation. In addition, since the gears can be rotated by directly contacting the circuit board and the housing, a gear mechanism with a reduced number of components can be realized, and an inexpensive and small rotation angle detection device can be realized. At the same time, the frictional heat generated in the gear can be conducted from the gear shaft to the housing, thereby preventing the gear from melting .

本発明の歯車支持機構を用いる回転角検出装置の断面図である。FIG. 3 is a cross-sectional view of a rotation angle detection device using the gear support mechanism of the present invention. 本発明の歯車支持機構を用いる別の回転角検出装置の立体分解図である。It is a three-dimensional exploded view of another rotation angle detecting device using the gear support mechanism of the present invention.

本発明に係る回転角検出装置は、回転軸の回転角度を検出する装置で、相互にかみ合いされた複数の歯車により構成される歯車機構を含む。各歯車の回転角度を検出することにより回転角検出装置に入力される回転軸の多回転のアブソリュート（絶対）回転角を検出することができる。図１は、このような回転角検出装置１００の断面図である。回転角検出装置１００の主回転軸１０１は、図示しないモーターの出力回転軸に結合され、回転角検出装置１００の入力となる。すなわち、回転角検出装置１００は、モーター出力回転軸の多回転アブソリュート回転角を検出することができる。   A rotation angle detection device according to the present invention is a device that detects a rotation angle of a rotation shaft, and includes a gear mechanism configured by a plurality of gears meshed with each other. By detecting the rotation angle of each gear, it is possible to detect a multi-rotation absolute (absolute) rotation angle of the rotation shaft input to the rotation angle detection device. FIG. 1 is a cross-sectional view of such a rotation angle detection device 100. The main rotation shaft 101 of the rotation angle detection device 100 is coupled to an output rotation shaft of a motor (not shown) and serves as an input of the rotation angle detection device 100. That is, the rotation angle detection device 100 can detect a multiple rotation absolute rotation angle of the motor output rotation shaft.

主回転軸１０１に固定された主軸歯車１０２は、従属歯車１０３にかみ合いされ、主軸歯車１０２の回転を従属歯車１０３に伝達する。従属歯車１０３は、回転角検出装置１００の筐体１０４に固定された歯車軸１０５に挿入され、歯車軸１０５を軸として自由に回転する。主回転軸１０１の先端部に磁石１０６が取り付けられ、磁石１０６は、主軸歯車１０２の回転とともに回転する。磁石１０６は、磁極となるＳ極とＮ極を交互に複数配列した環状の磁石である。また、従属歯車１０３に磁石１０８が組み込まれ、磁石１０８は、従属歯車１０３の回転とともに回転する。図１に示すように、従属歯車１０３に従属歯車１０３と一体整形された円筒状の収納容器１０７を設け、その中に磁石１０８を内蔵させてもよい。   The main shaft gear 102 fixed to the main rotation shaft 101 is engaged with the sub gear 103, and transmits the rotation of the main shaft gear 102 to the sub gear 103. The slave gear 103 is inserted into a gear shaft 105 fixed to a housing 104 of the rotation angle detection device 100, and freely rotates around the gear shaft 105. A magnet 106 is attached to the tip of the main rotating shaft 101, and the magnet 106 rotates with the rotation of the main shaft gear 102. The magnet 106 is an annular magnet in which a plurality of S poles and N poles serving as magnetic poles are alternately arranged. Further, the magnet 108 is incorporated in the slave gear 103, and the magnet 108 rotates with the rotation of the slave gear 103. As shown in FIG. 1, a subordinate gear 103 may be provided with a cylindrical storage container 107 integrally formed with the subordinate gear 103, and a magnet 108 may be built therein.

主回転軸１０１の先端部に対向する位置にＭＲセンサ等の磁気検出素子１０９が回路基板１１０上に取り付けられ、磁気検出素子１０９は、磁石１０６の回転によって生じる磁場の変化を検出する。また、磁石１０８に対向する位置にＭＲセンサ等の磁気検出素子１１１が回路基板１１０上に取り付けられ、磁気検出素子１１１は、磁石１０８の回転によって生じる磁場の変化を検出する。磁気検出素子１０９，１１１が検出した磁場の変化は、磁気検出信号として回路基板１１０上に配置された磁気検出回路（図示せず）に出力され、所定の演算により主回転軸１０１の多回転アブソリュート回転角を算出する。主軸歯車１０２、従属歯車１０３、磁石１０６，１０８、および磁気検出素子１０９，１１１は、磁気検出回路とともにアブソリュート磁気エンコーダ１１２を構成する。   A magnetic detection element 109 such as an MR sensor is mounted on the circuit board 110 at a position facing the tip of the main rotating shaft 101, and the magnetic detection element 109 detects a change in a magnetic field caused by rotation of the magnet 106. A magnetic detection element 111 such as an MR sensor is mounted on the circuit board 110 at a position facing the magnet 108, and the magnetic detection element 111 detects a change in a magnetic field caused by the rotation of the magnet 108. The change in the magnetic field detected by the magnetic detection elements 109 and 111 is output as a magnetic detection signal to a magnetic detection circuit (not shown) arranged on the circuit board 110, and the multi-rotation absolute of the main rotary shaft 101 is performed by a predetermined calculation. Calculate the rotation angle. The main shaft gear 102, the subordinate gear 103, the magnets 106 and 108, and the magnetic detection elements 109 and 111 constitute an absolute magnetic encoder 112 together with a magnetic detection circuit.

上述のように、従属歯車１０３は、主軸歯車１０２の回転により歯車軸１０５を中心として回転するが、回転角検出装置１００が設置された向きに応じて、従属歯車１０３に掛かる重力や、主軸歯車１０２との間のかみ合い反力により歯車軸１０５の軸方向に力が発生する。この力により従属歯車１０３は、歯車軸１０５の軸方向に移動しようとするが、以下説明するように従属歯車１０３は、筐体１０４と回路基板１１０により適正な隙間を維持した状態で支持され、適正な位置を保つことができる。   As described above, the slave gear 103 rotates around the gear shaft 105 by the rotation of the main shaft gear 102. However, depending on the direction in which the rotation angle detection device 100 is installed, the gravity applied to the slave gear 103 or the main shaft gear A force is generated in the axial direction of the gear shaft 105 due to the meshing reaction force with the gear shaft 105. This force causes the dependent gear 103 to move in the axial direction of the gear shaft 105. However, as described below, the dependent gear 103 is supported by the housing 104 and the circuit board 110 while maintaining an appropriate gap. The proper position can be maintained.

主軸歯車１０２の回転により従属歯車１０３が回転すると、従属歯車１０３と歯車軸１０５との間、および従属歯車１０３と筐体１０４との間の摺動部１０３ａに摩擦熱が発生する。この摩擦熱は、金属製の歯車軸１０５を使用することで容易に筐体１０４へ伝導させることができるので、従属歯車１０３が摩擦熱により溶融することを防ぐことができる。また、高硬度が得やすい軸受鋼、例えば高炭素クロム軸受鋼により歯車軸１０５を作製することにより、耐摩耗性や高い剛性を確保することができる。   When the slave gear 103 rotates due to the rotation of the main shaft gear 102, frictional heat is generated between the slave gear 103 and the gear shaft 105 and between the slave gear 103 and the housing 104 in the sliding portion 103a. The friction heat can be easily transmitted to the housing 104 by using the metal gear shaft 105, so that the slave gear 103 can be prevented from being melted by the friction heat. Further, by manufacturing the gear shaft 105 from bearing steel that easily obtains high hardness, for example, high carbon chromium bearing steel, wear resistance and high rigidity can be ensured.

主軸歯車１０２および従属歯車１０３は、吸水性・膨潤性が無く、寸法安定性に優れ、かつ潤滑性に優れたポリアセタールを基材とした樹脂を使用し、歯車間のあそびであるバックラッシが維持される。また、従属歯車１０３と摺動する筐体１０４の材料を選定するにあたり、様々な材料の組み合わせを検討した結果、筐体１０４を従属歯車１０３とは異種の材料とすることが、従属歯車１０３と筐体１０４間の摺動性を高めることができるという知見を得た。そこで、回転角検出装置１００の筐体１０４は、強度および剛性に優れたポリフェニルサルファイドを基材とした樹脂を採用した。しかしながら、強度および剛性に優れた材料であれば、従属歯車１０３と異なる材料である限り、他の樹脂材料を用いることができる。   The main shaft gear 102 and the slave gear 103 are made of a polyacetal-based resin having no water absorption / swelling properties, excellent dimensional stability, and excellent lubricity, and a backlash, which is play between gears, is maintained. You. Further, in selecting a material for the casing 104 that slides with the dependent gear 103, as a result of examining various combinations of materials, it has been determined that the casing 104 is made of a material different from the dependent gear 103. It has been found that the slidability between the housings 104 can be improved. Therefore, the housing 104 of the rotation angle detecting device 100 employs a resin having polyphenyl sulfide as a base material having excellent strength and rigidity. However, as long as the material has excellent strength and rigidity, another resin material can be used as long as the material is different from that of the dependent gear 103.

従属歯車１０３は、回路基板１１０により適正な隙間を維持した状態で支持される。従属歯車１０３の摺動性を高めるために、従属歯車１０３と回路基板１１０との隙間に摺動板１１３が挿入される。摺動性を高めるために、筐体１０４が従属歯車１０３とは異種の材料を用いたのと同様に、摺動板１１３は、従属歯車１０３の材料とは異なる材料が用いられる。摺動板１１３として、摺動性に優れたナイロン基材の樹脂材料が用いられ、例えば、ポリスライダーが用いられてもよい。この摺動板１１３を用いることで、回路基板１１０の製造ロットや製造元の違いにより、回路基板１１０の表面状態に変化が生じたとしても、従属歯車１０３と回路基板１１０との間の潤滑状態に変化が生じず、従属歯車１０３を安定して回転させることができる。また、摺動板１１３の摺動部の面積を出来るだけ小さくすることにより、従属歯車１０３と回路基板１１０との間の摩擦熱の発生を抑制することができる。なお、従属歯車１０３を回路基板１１０の摺動部に直接接しても、回路基板１１０の摺動部の耐久性に問題が無いことが確認できれば、従属歯車１０３と回路基板１１０との間に摺動板１１３を挿入する必要はない。   The slave gear 103 is supported by the circuit board 110 while maintaining an appropriate gap. In order to enhance the slidability of the dependent gear 103, a sliding plate 113 is inserted into a gap between the dependent gear 103 and the circuit board 110. In order to enhance the slidability, the sliding plate 113 is made of a material different from the material of the dependent gear 103, similarly to the case where the casing 104 is made of a material different from that of the dependent gear 103. As the sliding plate 113, a resin material of a nylon base material having excellent slidability is used, and for example, a polyslider may be used. By using the sliding plate 113, even if the surface state of the circuit board 110 changes due to the difference between the manufacturing lot and the manufacturer of the circuit board 110, the lubrication state between the dependent gear 103 and the circuit board 110 is reduced. No change occurs, and the dependent gear 103 can be rotated stably. Further, by reducing the area of the sliding portion of the sliding plate 113 as much as possible, the generation of frictional heat between the dependent gear 103 and the circuit board 110 can be suppressed. In addition, even if the slave gear 103 is in direct contact with the sliding part of the circuit board 110, if it is confirmed that there is no problem in the durability of the sliding part of the circuit board 110, the sliding between the slave gear 103 and the circuit board 110 is possible. There is no need to insert the moving plate 113.

収納容器１０７の上端面１０７ａが、内蔵した磁石１０８の上端面１０８ａより適正量だけ突出しており、その突出量で磁石１０８と磁気検出素子１１１との間隔が適正に保たれ、かつ、磁石１０８の上端面１０８ａが摺動板１１３と直接摺動することを防ぐことができる。   The upper end surface 107a of the storage container 107 protrudes by an appropriate amount from the upper end surface 108a of the built-in magnet 108, and the distance between the magnet 108 and the magnetic detection element 111 is appropriately maintained by the amount of protrusion, and It is possible to prevent the upper end surface 108a from sliding directly on the sliding plate 113.

図２は、図１に示される歯車機構の主回転軸１０１に２つの直列接続した従属歯車をさらに加えた歯車機構を有する別の回転角検出装置２００の立体分解図を示す。図２において、同一の参照番号は、図１の要素と同一または類似の要素を示す。なお、主回転軸１０１に固定された主軸歯車１０２と従属歯車１０３とからなる歯車機構は、図１と同一の構成であるので説明を省略する。   FIG. 2 is a three-dimensional exploded view of another rotation angle detecting device 200 having a gear mechanism in which two series-connected slave gears are further added to the main rotation shaft 101 of the gear mechanism shown in FIG. 2, the same reference numerals indicate the same or similar elements as those in FIG. The gear mechanism composed of the main shaft gear 102 fixed to the main rotation shaft 101 and the subordinate gear 103 has the same configuration as that of FIG.

図２において、モーター本体２０１の出力回転軸に主回転軸１０１が結合される。主回転軸１０１に固定された主軸歯車１０２は、筐体１０４に固定された歯車軸２０２に挿入された第１従属歯車２０３ａとかみ合いし、第１従属歯車２０３ａは、第１歯車軸２０２を軸中心として自由に回転する。第１従属歯車２０３ａは、第１従属歯車２０３ａの歯数と異なる歯数を有する第２従属歯車２０３ｂと一体整形される。第２従属歯車２０３ｂの上部には、円筒状の収納容器２０４が第１，２従属歯車２０３ａ，ｂと共に一体整形され、その収納容器２０４内に磁石２０５が内蔵される。主回転軸１０１、磁石１０６、および、回路基板１１０の中心は、中心軸Ｘ１に沿って配置される。また、歯車軸１０５、従属歯車１０３、および、磁石１０８の中心は、中心軸Ｘ２に沿って配置される。さらに、歯車軸２０２、第１従属歯車２０３ａ、第２従属歯車２０３ｂ、および、磁石２０５の中心は、中心軸Ｘ３に沿って配置される。   In FIG. 2, a main rotation shaft 101 is coupled to an output rotation shaft of a motor main body 201. The main shaft gear 102 fixed to the main rotation shaft 101 meshes with a first dependent gear 203a inserted into a gear shaft 202 fixed to the housing 104, and the first driven gear 203a Rotate freely as center. The first subsidiary gear 203a is integrally formed with a second subsidiary gear 203b having a number of teeth different from the number of teeth of the first subsidiary gear 203a. Above the second dependent gear 203b, a cylindrical storage container 204 is integrally formed with the first and second dependent gears 203a and 203b, and a magnet 205 is built in the storage container 204. The centers of the main rotation shaft 101, the magnet 106, and the circuit board 110 are arranged along the center axis X1. Further, the centers of the gear shaft 105, the slave gear 103, and the magnet 108 are arranged along the center axis X2. Further, the centers of the gear shaft 202, the first subsidiary gear 203a, the second subsidiary gear 203b, and the magnet 205 are arranged along the central axis X3.

第２従属歯車２０３ｂは、さらに筐体１０４に固定された第２歯車軸２０６に挿入された第３従属歯車２０７とかみ合いし、第３従属歯車２０７は、第２歯車軸２０６を軸中心として自由に回転する。第３従属歯車２０７の上部には、円筒状の収納容器２０８が第３従属歯車２０７と共に一体整形され、その収納容器２０８内に磁石２０９が内蔵される。このような歯車機構により、主回転軸１０１の回転は、主軸歯車１０２から第１従属歯車２０３ａへ伝達され、第１従属歯車２０３ａと一体整形された第２従属歯車２０３ｂからさらに第３従属歯車２０７へ伝達される。歯車軸２０６、第３従属歯車２０７、および、磁石１０９の中心は、中心軸Ｘ４に沿って配置される。   The second dependent gear 203b further meshes with a third dependent gear 207 inserted into a second gear shaft 206 fixed to the housing 104, and the third dependent gear 207 is free to rotate about the second gear shaft 206 as an axis. To rotate. Above the third subsidiary gear 207, a cylindrical storage container 208 is integrally formed with the third subsidiary gear 207, and a magnet 209 is built in the storage container 208. With such a gear mechanism, the rotation of the main rotation shaft 101 is transmitted from the main shaft gear 102 to the first subordinate gear 203a, and from the second subordinate gear 203b integrally formed with the first subordinate gear 203a to the third subordinate gear 207. Is transmitted to The centers of the gear shaft 206, the third subsidiary gear 207, and the magnet 109 are arranged along the central axis X4.

第１，３従属歯車２０３ａ，２０７の回転は、第１，２歯車軸２０２，２０６に摩擦熱を生じさせるが、この摩擦熱は、第１，２歯車軸２０２，２０６が金属であるので容易に筐体１０４へ伝導させることができ、歯車軸１０５と同様に、摩擦熱による第１，２，３従属歯車２０３ａ，２０３ｂ，２０７の溶融を防止することができる。また、高硬度が得やすい軸受鋼、例えば高炭素クロム軸受鋼により第１，２歯車軸２０２，２０６を作製することにより、耐摩耗性や高い剛性を確保することができることは、歯車軸１０５と同様である。   The rotation of the first and third dependent gears 203a and 207 generates frictional heat on the first and second gear shafts 202 and 206. This frictional heat is easily generated because the first and second gear shafts 202 and 206 are made of metal. Thus, similarly to the gear shaft 105, it is possible to prevent the first, second, and third dependent gears 203a, 203b, and 207 from melting due to frictional heat. Further, by producing the first and second gear shafts 202 and 206 from bearing steel that easily obtains high hardness, for example, high carbon chromium bearing steel, wear resistance and high rigidity can be secured. The same is true.

図１に示される磁石１０８と磁石１０８に対向する位置に配置された磁気検出素子１１１との間の位置関係と同様に、磁石２０５，２０９に対向する回路基板１１０上の位置に磁気検出素子（図示せず）がそれぞれ配置される。これらの磁気検出素子から出力される磁気検出信号に基づいて、回路基板１１０上に配置された磁気検出回路（図示せず）は、所定の演算を実行して、主回転軸１０１の多回転アブソリュート回転角を算出する。   Similar to the positional relationship between the magnet 108 shown in FIG. 1 and the magnetic detection element 111 disposed at a position facing the magnet 108, the magnetic detection element ( (Not shown). Based on the magnetic detection signals output from these magnetic detection elements, a magnetic detection circuit (not shown) arranged on the circuit board 110 executes a predetermined operation to execute the multi-rotation absolute rotation of the main rotation shaft 101. Calculate the rotation angle.

筐体１０４の材料に関して上述したように、従属歯車１０３および筐体１０４を相互に異なる材料とすることが、従属歯車１０３の摺動性を高めることができるという知見に基づき、第１，２，３従属歯車２０３ａ，２０３ｂ，２０７は、筐体１０４の材料と異なる材料が用いられる。第１，２，３従属歯車２０３ａ，２０３ｂ，２０７の材料は、従属歯車１０３と同様に、ポリアセタールを基材とした樹脂を使用する。なお、第１，２，３従属歯車２０３ａ，２０３ｂ，２０７は、筐体１０４の材料と異なる材料である限り、他の樹脂材料を用いてもよい。   As described above with respect to the material of the casing 104, based on the finding that the slidability of the dependent gear 103 can be improved by using different materials for the dependent gear 103 and the casing 104, A material different from the material of the housing 104 is used for the three dependent gears 203a, 203b, and 207. As the material of the first, second, and third dependent gears 203a, 203b, and 207, a resin based on polyacetal is used as in the case of the dependent gear 103. The first, second, and third dependent gears 203a, 203b, and 207 may be made of another resin material as long as the material is different from the material of the housing 104.

回路基板１１０と収納容器２０４，２０８の上端面２０４ａ，２０８ａとの間に摺動性を高めるための摺動板２１０が挿入される。摺動性を高めるために、摺動板２１０は、第１，２，３従属歯車２０３ａ，２０３ｂ，２０７の材料とは異なる材料が用いられる。摺動板２１０として、摺動板１１３と同様に、摺動性に優れたナイロン基材の樹脂材料が用いられ、例えば、ポリスライダーが用いられてもよい。この摺動板２１０により、回路基板１１０の表面状態に変化が生じたとしても、第１，２，３従属歯車２０３ａ，２０３ｂ，２０７を安定して回転させることができる。また、摺動板２１０における摺動部の面積を出来るだけ小さくすることにより、上端面２０４ａ，２０８ａと摺動板２１０との間の摩擦熱の発生を抑制することができる。なお、上端面２０４ａ，２０８ａを回路基板１１０に直接接触させても、回路基板１１０上の摺動部の耐久性に問題が無いことが確認できれば、上端面２０４ａ，２０８ａと回路基板１１０との間に摺動板２１０を挿入する必要はない。   A sliding plate 210 for improving slidability is inserted between the circuit board 110 and the upper end surfaces 204a and 208a of the storage containers 204 and 208. In order to enhance the slidability, a material different from the material of the first, second, and third dependent gears 203a, 203b, and 207 is used for the sliding plate 210. As the sliding plate 210, similarly to the sliding plate 113, a nylon-based resin material having excellent slidability is used, and for example, a polyslider may be used. The sliding plate 210 can stably rotate the first, second, and third dependent gears 203a, 203b, and 207 even when the surface state of the circuit board 110 changes. Further, by reducing the area of the sliding portion of the sliding plate 210 as much as possible, it is possible to suppress the generation of frictional heat between the upper end surfaces 204a and 208a and the sliding plate 210. Even if the upper end surfaces 204a and 208a are brought into direct contact with the circuit board 110, if it is confirmed that there is no problem in the durability of the sliding portion on the circuit board 110, the contact between the upper end surfaces 204a and 208a and the circuit board 110 is possible. It is not necessary to insert the sliding plate 210 in the first position.

なお、収納容器２０４，２０８の上端面２０４ａ，２０８ａを、内蔵した磁石２０５，２０９の上端面２０５ａ，２０９ａより１ミリメートル未満の適正量だけ突出させることにより、その突出量で磁石２０５，２０９と磁石２０５，２０９に対向する磁気検出素子との間隔を適正に保つことができ、かつ、磁石２０５，２０９の上端面２０５ａ，２０９ａが摺動板２１０と直接摺動することを防ぐことができる。   The upper end surfaces 204a, 208a of the storage containers 204, 208 are made to protrude from the upper end surfaces 205a, 209a of the built-in magnets 205, 209 by an appropriate amount of less than 1 mm, so that the magnets 205, 209 It is possible to maintain a proper distance between the magnets 205 and 209 and the opposing magnetic detecting element and prevent the upper end surfaces 205a and 209a of the magnets 205 and 209 from directly sliding on the sliding plate 210.

以上のように、歯車が筐体に接触して回転する場合、歯車と筐体を異種の材料で作製することにより、歯車をスムーズに回転させることができるので、筐体に対する歯車の摺動性を高めることができるとともに、高速回転に適応させることができる。歯車を筐体に直接接触させて回転することができることから、部品点数を削減した歯車機構を実現することができ、安価で小型の回転角検出装置を実現することが可能となる。   As described above, when the gear rotates in contact with the casing, the gear and the casing are made of different materials, so that the gear can be smoothly rotated. , And can be adapted to high-speed rotation. Since the gear can be rotated by directly contacting the housing, a gear mechanism with a reduced number of components can be realized, and a low-cost and small rotation angle detecting device can be realized.

１００，２００ 回転角検出装置
１０１ 主回転軸
１０２ 主軸歯車
１０３ 従属歯車
１０４ 筐体
１０５ 歯車軸
１０６ 磁石
１０７ 収納容器
１０７ａ 上端面
１０８ 磁石
１０８ａ 上端面
１０９，１１１ 磁気検出素子
１１０ 回路基板
１１２ アブソリュート磁気エンコーダ
１１３ 摺動板
２０１ モーター本体
２０２ 歯車軸
２０３ａ 第１従属歯車
２０３ｂ 第２従属歯車
２０４，２０８ 収納容器
２０４ａ，２０８ａ 上端面
２０５ 磁石
２０５ａ，２０９ａ 上端面
２０６ 第２歯車軸
２０７ 第３従属歯車
２０９ 磁石
２１０ 摺動板 REFERENCE SIGNS LIST 100, 200 rotation angle detection device 101 main rotation shaft 102 main shaft gear 103 slave gear 104 housing 105 gear shaft 106 magnet 107 storage container 107 a upper end surface 108 magnet 108 a upper end surface 109, 111 magnetic detection element 110 circuit board 112 absolute magnetic encoder 113 Sliding plate 201 Motor main body 202 Gear shaft 203a First dependent gear 203b Second dependent gear 204,208 Storage container 204a, 208a Upper surface 205 Magnet 205a, 209a Upper surface 206 Second gear shaft 207 Third dependent gear 209 Magnet 210 Slide Moving plate

Claims (3)

モーターの出力回転を入力する主回転軸に結合された主軸歯車および前記主軸歯車の回転に従属して回転する少なくとも１つの従属歯車からなる歯車機構の、前記主軸歯車および前記従属歯車の回転角から前記主回転軸の回転角を求める多回転回転角検出装置において、
樹脂で形成され、前記歯車機構を収容する筐体と、
前記筐体および回路基板の間に位置する従属歯車であって、前記従属歯車は前記回路基板および前記筐体と回転可能に直接接しており、前記筐体とは異なる樹脂で形成された前記従属歯車と、を含み、
前記従属歯車は、前記筐体に直接接して固定された軸受鋼の歯車軸に挿入され、前記歯車軸を中心に回転し、前記歯車軸は、前記従属歯車の回転により前記従属歯車内に発生する摩擦熱を前記筐体に伝導させることを特徴とする多回転回転角検出装置。 The rotation angle of the main shaft gear and the subordinate gear of a gear mechanism including a main shaft gear coupled to a main rotation shaft that inputs the output rotation of the motor and at least one sub gear that rotates in accordance with the rotation of the main shaft gear. In a multi-rotation angle detection device that determines the rotation angle of the main rotation shaft,
A housing formed of resin and housing the gear mechanism;
A slave gear positioned between the housing and the circuit board, wherein the slave gear is in direct contact with the circuit board and the housing in a rotatable manner, and is formed of a different resin from the housing. And a gear,
The slave gear is inserted into a bearing steel gear shaft fixed directly in contact with the housing and rotates about the gear shaft, and the gear shaft is generated in the slave gear by rotation of the slave gear. multiple rotation rotation angle detecting apparatus of the frictional heat, characterized in Rukoto is conducted to the housing. 前記筐体は、ポリフェニルサルファイドを基材とした樹脂により形成され、また前記従属歯車は、ポリアセタールを基材とした樹脂により形成されることを特徴とする請求項１記載の多回転回転角検出装置。   The multi-rotational rotation angle detection device according to claim 1, wherein the housing is formed of a resin based on polyphenyl sulfide, and the dependent gear is formed of a resin based on polyacetal. apparatus. 前記従属歯車は前記従属歯車の回転角を検出するために用いられる磁石を内蔵し、前記従属歯車の前記回路基板側の端面は前記磁石より予め定める量だけ突出していることを特徴とする請求項１または２に記載の多回転回転角検出装置。 The said dependent gear incorporates a magnet used for detecting a rotation angle of the dependent gear, and an end face of the dependent gear on the circuit board side projects by a predetermined amount from the magnet. 3. The multi-rotation angle detection device according to 1 or 2 .
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