JP2004203224A - Actuator - Google Patents

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Publication number
JP2004203224A
JP2004203224A JP2002375015A JP2002375015A JP2004203224A JP 2004203224 A JP2004203224 A JP 2004203224A JP 2002375015 A JP2002375015 A JP 2002375015A JP 2002375015 A JP2002375015 A JP 2002375015A JP 2004203224 A JP2004203224 A JP 2004203224A
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Japan
Prior art keywords
housing
gear
wall portion
receiving wall
bottom portion
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JP2002375015A
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JP4226893B2 (en
Inventor
Kazuhiro Toyama
和宏 外山
Toshio Makino
登志雄 牧野
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Asmo Co Ltd
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Asmo Co Ltd
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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Gear Transmission (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized actuator to turn an output shaft. <P>SOLUTION: An actuator 1 comprises a stepping motor to rotate a rotary shaft 21 by a predetermined angle based on a pulse signal, and a second intermediate gear 16 to rotate an output gear 17 to be integrally turned with an output shaft 26 by a predetermined angle in an interlocking manner with the rotational angle of a drive gear 14 integrally rotated with the rotary shaft 21. The actuator 1 rotates the second intermediate gear 16 to engage a receiving wall part 27 formed in a first housing 12 with a regulation part 34 formed in the second intermediate gear 16, and directs the output shaft 26 in the reference direction. The actuator 1 controls the turn of the output shaft 26 by rotating the output shaft 26 by a predetermined angle from the reference direction based on the pulse signal. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、出力軸を回動させるアクチュエータに関するものである。
【０００２】
【従来の技術】
従来、車両用ランプの照射方向を制御するアクチュエータは、該車両用ランプの照射方向を変化させるための駆動力を提供するブラシレスモータを使用していた（例えば、特許文献１）。
【０００３】
詳述すると、ブラシレスモータの回転軸は、減速機構を介して、車両用ランプが一体的に回動するように取付けられた出力軸に駆動連結されており、該回転軸の回転により車両用ランプの照射方向が変更される。
【０００４】
しかし、車両用ランプの照射方向を所定角度だけ回動させる制御には、車両用ランプの照射方向を検出するためのセンサが必要であり、製造コストが高くなる原因となっていた。
【０００５】
そこで、パルス信号のパルス数によって回転軸を所定角度回転させることができるステッピングモータを使用して、車両用ランプの照射方向を制御する方法が考えられる。
【０００６】
図６に、ステッピングモータを用いたアクチュエータ９０を示す。このアクチュエータ９０は、ステッピングモータの回転軸９１に一体回動可能に取着されたギヤ９２が第１及び第２減速ギヤ９３、９４を介して出力軸９５に一体回動可能に取着された出力ギヤ９６に駆動連結されている。アクチュエータ９０のハウジング９７には、出力ギヤ９６の端部９６ａと係合する受壁部９８が設けられている。図示しない制御装置は、出力ギヤ９６の端部９６ａが受壁部９８と係合するようにステッピングモータにパルス信号を印加した後、車両の進行方向に応じてステッピングモータを正方向又は逆方向に回転させるようにパルス信号を印加する。このように、受壁部９８に出力ギヤ９６を押し当てて出力軸９５の回動位置を初期化した後、車両の進行方向に応じて印加するパルス信号により出力軸９５を正方向及び逆方向に回転させることで、その出力軸９５に取着された図示しない車両用ランプの照射方向を制御する。
【０００７】
【特許文献１】
特開２００２−１６０５８１号公報
【０００８】
【発明が解決しようとする課題】
ところで、ステッピングモータの回転軸９１から伝達された駆動力は、第１及び第２減速ギヤ９３、９４を用いているため、出力ギヤ９６において最も回転トルクが大きくなり、受壁部９８に出力ギヤ９６を押し当てたときの負荷が大きい。このため、出力軸９５の回動方向、即ち車両ランプの照射方向を精度良く制御するためには、出力ギヤ９６の強度及びハウジング９７に設けた受壁部９８の強度を確保しなければならず、出力ギヤ９６やハウジング９７の厚みを増すことによりアクチュエータの大型化を招いていた。
【０００９】
本発明は上記問題点を解決するためになされたものであって、その目的は、小型のアクチュエータを提供することにある。
【００１０】
【課題を解決するための手段】
上記目的を達成するために、請求項１に記載の発明は、出力軸に取着される被回動部材の基準位置からの回動位置を制御するために用いられるアクチュエータであって、パルス信号に基づいて回動駆動するステッピングモータにより駆動ギヤ及び中間ギヤを介して前記出力軸に一体回動可能に取着された出力ギヤが減速回動され、前記中間ギヤ及び前記出力ギヤがハウジング内に軸支収容されたアクチュエータにおいて、前記中間ギヤ及び前記ハウジングには、該中間ギヤ回動により互いに係合する規制部及び受壁部が備えられ、前記受壁部と前記規制部とが係合したときの前記出力軸の回動を基準方向として、前記出力軸の回動方向が前記パルス信号により制御される。
【００１１】
請求項２に記載の発明は、前記規制部は、前記中間ギヤに備えられた円盤状のギヤ部の内径側であって該ギヤ部の回動軸の周方向に沿って形成された環状の凹部内に形成されており、前記受壁部は、その先端部分が前記凹部に挿入され、かつ、前記規制部と係合するまで前記中間ギヤが回転可能な形状に形成された。
【００１２】
請求項３に記載の発明は、前記ハウジングは、前記受壁部が形成された第１のハウジングと、前記第１のハウジングを閉塞する第２のハウジングと、から構成され、前記第１のハウジングに前記ステッピングモータを固定した。
【００１３】
請求項４に記載の発明は、前記第１のハウジングは、底部とその底部の外縁を囲む側壁部とからなり、前記第２のハウジングは、前記第１のハウジングの側壁部に固定される平板からなり、前記第１のハウジングの底部は、前記第２のハウジングからの距離が異なる浅底部と深底部とからなり、第２のハウジングからの距離が深底部より短い浅底部の内側面に前記受壁部を形成した。
【００１４】
請求項５に記載の発明は、前記受壁部は、前記浅底部から前記深底部までを繋ぐ壁部と前記浅底部により形成される角に備えられた。
請求項６に記載の発明は、前記浅底部の外側面に前記ステッピングモータを固定した。
【００１５】
請求項７に記載の発明は、前記規制部と前記受壁部は、その係合する面を平坦面にした。
（作用）
請求項１に記載の発明によれば、受壁部に中間ギヤに備えた規制部を係合させることにより、出力軸の基準方向を決定することができる。このため、回転させたとき回転トルクの大きい出力ギヤの回転を規制するときに加わる負荷より、中間ギヤに加わる負荷の方が小さくなる。
【００１６】
請求項２に記載の発明によれば、規制部を中間ギヤに形成された凹部内に形成し、受壁部を凹部に挿入することにより、ハウジング内に受壁部と規制部とを備えるためのスペースが必要なくなり、アクチュエータが小さくなる。
【００１７】
請求項３に記載の発明によれば、受壁部が形成された第１のハウジングにステッピングモータを固定した。このため、受壁部と規制部とが係合したときの衝撃で第１のハウジングと第２のハウジングの位置関係がずれることが無くなるので、受壁部とステッピングモータの位置関係がずれることが無くなる。このため、確実に基準方向を決定することができる。
【００１８】
請求項４に記載の発明によれば、浅底部に受壁部を備えたので、受壁部の突出幅が小さくなり、受壁部の剛性が向上する。また、２段底にすることにより、第１のハウジングの剛性が向上する。
【００１９】
請求項５に記載の発明によれば、壁部と浅底部とにより形成される角に前記受壁部を備えたので、受壁部及び第１のハウジングの剛性が向上する。
請求項６に記載の発明によれば、ステッピングモータを第１のハウジングの外に固定したことにより、ステッピングモータが各種ギヤの配置に干渉しなくなり、各種ギヤが密にして配置することができる。また、浅底部と壁部によって形成された凹みにステッピングモータを取付けたので、アクチュエータの全長が小さくなる。
【００２０】
請求項７に記載の発明によれば、受壁部は、規制部の平坦面と係合するので、係合したときの負荷が小さくなる。
【００２１】
【発明の実施の形態】
以下、本発明を具体化した一実施形態を図面に従って説明する。
図１は、本実施形態のアクチュエータ１を取付けた車両２の概略平面図である。
【００２２】
車両２の進行方向を制御するハンドル３には、そのハンドル３の回転量を検知するセンサ４が取付けられ、該センサ４には、制御装置５が接続されている。該制御装置５には、被回動部材としての車両用ランプ６の照射方向を変更するアクチュエータ１が接続されている。該車両用ランプ６は、車両２の先端に取付けられている。
【００２３】
図２は、本実施形態におけるアクチュエータ１の各ギヤの軸に沿って切断した断面図である。図３は、アクチュエータ１の内部の構成を説明するための平面図である。
【００２４】
アクチュエータ１は、第１のハウジング１２及び第２のハウジング１３を備え、その内部に駆動ギヤ１４、第１中間ギヤ１５、第２中間ギヤ１６及び出力ギヤ１７等が収容され、第１のハウジング１２の外部にステッピングモータ１８が取着されている。
【００２５】
第１のハウジング１２は、略四角形状の底部１２ａと、該底部１２ａの外縁を囲むように、その外縁から該底部１２ａに対して垂直方向に沿って延出形成された側壁部１２ｂと、からなる。このように構成された第１のハウジング１２を閉塞するように平板状の第２のハウジング１３が側壁部１２ｂに取付けられる。また、第１のハウジング１２の底部１２ａは、２段底になっている。つまり、第１のハウジング１２の底部１２ａは、第２のハウジング１３から底部１２ａまでの距離が短い浅底部１９と、第２のハウジング１３から底部１２ａまでの距離が長い深底部２０とから構成されている。
【００２６】
浅底部１９には、第１上側軸受２２ａが固定され、該第１上側軸受２２ａ及びカップ状のモータケース１１の底部に固定されたモータ内軸受２２ｂにより、ステッピングモータ１８の回転軸２１を回転可能に軸支している。また、浅底部１９の内側面１９ａには、第２上側軸受２３ａが形成され、第２のハウジング１３には、該第２上側軸受２３ａに対応する第２下側軸受２３ｂが形成されており、該第２上側軸受２３ａ及び第２下側軸受２３ｂが、第１中間ギヤ１５を回転可能に軸支している。深底部２０には、第３上側軸２４ａ受けが形成され、第２のハウジング１３には、該第３上側軸受２４ａに対応する第３下側軸受２４ｂが形成されており、該第３上側軸受２４ａ及び第３下側軸受２４ｂが、第２中間ギヤ１６を回転可能に軸支している。そして、深底部２０には、第４上側軸受２５ａが形成され、第２のハウジング１３には、該第４上側軸受２５ａに対応する第４下側軸受２５ｂが形成されており、該第４上側軸受２５ａ及び第４下側軸受２５ｂが、出力軸２６を回動可能に軸支している。
【００２７】
また、浅底部１９には、浅底部１９から第２のハウジング１３に向かって突出している受壁部２７が延出形成されている。該受壁部２７は、図４に示すように、第３上側軸受２４ａの軸心を中心とした扇形形状をしており、その周方向両端には、径方向に沿った平坦面２７ａが形成されている。また、受壁部２７は、浅底部１９と深底部２０とを繋ぐ壁部２８の反対側近傍に位置する。即ち、受壁部２７は、浅底部１９と壁部２８により形成される角の付近に形成される。尚、図４は、第１のハウジング１２を、第２のハウジング１３側からみたときの様子を示す平面図である。
【００２８】
そして、この浅底部１９の外側面１９ｂからステッピングモータ１８が取着されている。ステッピングモータ１８は、図１に示す制御装置５から入力されるパルス信号により、回転軸２１を所定角度回転する。尚、本実施形態においては、車両２のハンドル３に接続されたセンサ４は、ハンドル３の回動量を検知し、その値を制御装置５に送信する。そして、制御装置５は、ハンドル３の回動量に比例して、ステッピングモータ１８の回転軸２１が所定角度回転するようにパルス信号を出力する。即ち、ハンドル３を回転させることにより、車両２の方向及び車両用ランプ６の照射方向が制御され、車両用ランプ６が車両２の進行方向を照射する。
【００２９】
ステッピングモータ１８の回転軸２１は、第１上側軸受２２ａ及びモータ内軸受２２ｂにより回転可能に軸支されている。該回転軸２１の先端付近には、回転軸２１と一体的に回転する駆動ギヤ１４が備えられている。
【００３０】
第１中間ギヤ１５は、第２上側軸受２３ａ及び第２下側軸受２３ｂにより、回転可能に軸支されている。該第１中間ギヤ１５は、円盤状の大径ギヤ２９と小径ギヤ３０とが一体に形成されており、該大径ギヤ２９が前記駆動ギヤ１４と噛合している。
【００３１】
第２中間ギヤ１６は、第３上側軸受２４ａ及び第３下側軸受２４ｂにより、回転可能に軸支されている。該第２中間ギヤ１６は、ギヤ部として円盤状の大径ギヤ３１と小径ギヤ３２とが一体に形成されており、該大径ギヤ３１が前記第１中間ギヤ１５の小径ギヤ３０と噛合している。
【００３２】
図５（ａ）及び図５（ｂ）に示すように、第２中間ギヤ１６の大径ギヤ３１の内径側には、環状の凹部３３が形成されている。そして、該凹部３３の底部から軸線方向に沿って延びるように規制部３４が突設されている。該規制部３４は、図５（ｂ）に示すように、第２中間ギヤ１６の軸心を中心とする扇形形状に形成され、その周方向両端には、径方向に沿った平坦面３４ａが形成されている。
【００３３】
以上のように構成された第２中間ギヤ１６は、図２に示すように、該凹部３３が第１のハウジング１２の底部１２ａに対向するように取付けられ、第３上側軸受２４ａと第３下側軸受２４ｂにより軸支される。また、このとき、浅底部１９に備えられた受壁部２７が規制部３４と周方向に係合するように凹部３３に挿入される。
【００３４】
即ち、受壁部２７は、凹部３３の形状に合わせて扇形状をしており、さらに、その先端部が凹部３３に形成された規制部３４と係合可能なように突出している。また、受壁部２７の外径面から内径面までの幅が凹部３３の外径面から内径面までの幅より小さく形成されている。このため、第２中間ギヤ１６は、受壁部２７が凹部３３に挿入された状態で、凹部３３から突出形成された規制部３４の平坦面３４ａが受壁部２７の平坦面２７ａに係合するまで回動することができる。
【００３５】
深底部２０に形成された第４上側軸受２５ａに対応して第２のハウジング１３には、第４下側軸受２５ｂが形成され、該第４上側軸受２５ａ及び第４下側軸受２５ｂにより、出力軸２６が回転可能に軸支されている。該出力軸２６は、出力ギヤ１７が一体に形成されている。該出力ギヤ１７は、円弧状に形成された出力ギヤ部１７ａを有しており、該出力ギヤ部１７ａが第２中間ギヤ１６の小径ギヤ３２と噛合している。また、出力軸２６の先端は第１のハウジング１２から突出し、その先端には、車両用ランプ６が一体的に回動するように連結される。
【００３６】
該出力軸２６の第１のハウジング１２から突出していない一端には、出力軸２６の軸心を中心とする円筒形状の収容凹部３５が形成されている。該収容凹部３５には円筒形状のリング３６が収容されている。尚、該リング３６は、該収容凹部３５の開口端に形成されたかしめ部３５ａにより固定されている。そして、該リング３６の内周面には、対向する一対の磁石３７が固定されている。リング３６の中心、即ち、出力軸２６の中心には、第２のハウジング１３に固定された磁気センサ３８が配置されている。該磁気センサ３８は、磁石３７により発生する磁束量を計測しており、磁束量の変化により出力ギヤ１７の位置、即ち、車両用ランプ６の照射方向を検知する。この磁気センサ３８は、車両用ランプ６を基準方向に向ける際に、ステッピングモータ１８が脱調したか否か、及び、確実に車両用ランプ６が基準方向に向いたか否かを確認するために使用される。
【００３７】
ここで、車両用ランプ６の照射方向を制御する方法について説明する。
車両２のハンドル３を動かして車両２及び車両用ランプ６を制御する前に、制御装置５は、初期設定を行う旨のパルス信号をステッピングモータ１８に出力する。ステッピングモータ１８は、制御装置５からそのパルス信号を受け取り、回転軸２１を回転させる。回転軸２１と共に駆動ギヤ１４が回転し、その回転に連動して第１中間ギヤ１５及び第２中間ギヤ１６が回転する。そして、第２中間ギヤ１６は、第２中間ギヤ１６に設けられた規制部３４が受壁部２７によってその回動運動が規制されるまで第２中間ギヤ１６を回動する。このとき、出力ギヤ１７は、第２中間ギヤ１６の小径ギヤ３２と噛合しているので、第２中間ギヤ１６が所定角度回動すると、その動きに連動して出力軸２６及び車両用ランプ６も所定角度回動する。このため、出力軸２６及び車両用ランプ６は、第２中間ギヤ１６の規制部３４が受壁部２７と係合するまで回動する。尚、制御装置５は、初期設定を行うためのパルス信号出力後、磁気センサ３８により車両用ランプ６の照射方向が基準方向に向いたか否かを確認し、初期設定が終了したか否かを判断する。
【００３８】
そして、規制部３４と受壁部２７とが係合したときの車両用ランプ６の照射方向を基準方向として制御装置５に予め記憶させておけば、制御装置５は、初期設定後、基準方向から所定角度回転させるパルス信号を出力することにより、車両用ランプ６を指定した方向に向けるように制御できる。即ち、制御装置５は、車両２のハンドル３の回転角度に基づいて、パルス信号をアクチュエータ１に出力し、車両２の進行方向に合わせて車両用ランプ６の照射方向を変更することができる。
【００３９】
以上詳述したように本実施の形態は、以下の特徴を有する。
（１）第１のハウジング１２に受壁部２７を備え、該受壁部２７に第２中間ギヤ１６に備えられた規制部３４を押し当てて、出力軸２６の基準方向、即ち、車両用ランプ６の基準とする照射方向を決定する。第２中間ギヤ１６の回転トルクは、出力ギヤ１７の回転トルクより小さいので、受壁部２７に規制部３４を押し当てたときの負荷が、従来における負荷と比べて少ない。即ち、受壁部２７及び規制部３４の強度の剛性を大きくする必要が無くなる。このため、第１のハウジング１２、出力ギヤ１７及び第２中間ギヤ１６を小型化することができ、アクチュエータ１を小型化することが可能となる。
【００４０】
（２）第２中間ギヤ１６の凹部３３内に規制部３４を設け、受壁部２７を該凹部３３に挿入するようにしたので、受壁部２７及び規制部３４を設けるために余分なスペースを必要とせず、アクチュエータ１を小型化することができる。
【００４１】
（３）受壁部２７を備えた第１のハウジング１２にステッピングモータ１８を固定した。このため、第２のハウジング１３にステッピングモータ１８を取付けて受壁部２７に規制部３４を押し当てた場合に、押し当てたときの衝撃によって生じる第１のハウジング１２と第２のハウジング１３とのずれを防止する。このため、初期設定を行う際、車両用ランプ６の照射方向を確実に基準方向に向けることが可能となる。
【００４２】
（４）第１のハウジング１２の底部１２ａを段付きにしたことにより、第１のハウジング１２自体の剛性を向上することができる。また、浅底部１９に受壁部２７を設けたことにより、深底部２０に設けた場合よりも、受壁部２７が突出する長さを短くすることができ、受壁部２７の剛性が向上する。また、深底部２０と浅底部１９とを繋ぐ壁部２８近傍に受壁部２７を設けたので、受壁部２７の剛性が向上する。このため、第１のハウジング１２及び受壁部２７の剛性を確保しつつ、第１のハウジング１２を小型化することができる。
【００４３】
（５）ステッピングモータ１８を浅底部１９の外側面１９ｂに固定した。このため、ステッピングモータ１８に干渉されずに、各種ギヤを余分なスペースを空けずに配置することができ、アクチュエータ１を小型化することが可能となる。また、浅底部１９の外側面１９ｂに固定したので、アクチュエータ１の全長を短くすることができ、アクチュエータ１を小型化することが可能となる。
【００４４】
（６）規制部３４は、第２中間ギヤ１６の軸心を中心とした扇形状をしており、その周方向両端に径方向に沿って受壁部２７の平坦面２７ａに押し当てられる平坦面３４ａを備えている。平坦面２７ａ、３４ａ同士を係合することにより、係合したときの面圧が小さくなり、受壁部２７と規制部３４との間に生じる負荷を小さくすることができる。このため、受壁部２７及び規制部３４の耐久性を向上することができる。また、規制部３４及び受壁部２７を扇形状にしたことにより、それらの周方向の長さにより、車両用ランプ６の回動範囲を決定することが可能となる。
【００４５】
なお、上記以外に次の形態にて具体化できる。
○上記実施形態において、出力ギヤ１７が予め決められた所定の回動範囲内で回動するように規制する一対の受壁部を、出力ギヤ１７の両端に設けてもよい。
【００４６】
○上記実施形態では、出力軸２６を基準方向に向ける際に、ステッピングモータ１８が脱調したか否か、及び、確実に出力軸２６が基準方向に向いたか否かを確認するために使用する磁気センサ３８を設けたが、設けなくても良い。尚、この場合も、上記実施形態と同様の効果を得ることができる。
【００４７】
○上記実施形態では、規制部３４及び受壁部２７にそれぞれ平坦面３４ａ、２７ａを設けたが、常に一定の場所で受壁部２７に規制部３４が係合するならば、平坦面３４ａ、２７ａでなくても良い。
【００４８】
○上記実施形態では、駆動ギヤ１４の駆動力を出力ギヤ１７に伝達するために、第１中間ギヤ１５及び第２中間ギヤ１６の２個のギヤを介していたが、複数のギヤを介して出力ギヤ１７に駆動力を伝えても良い。また、１個のギヤを介して駆動ギヤ１４の駆動力を出力ギヤ１７に伝達してもよい。また、この場合、第２中間ギヤ１６に規制部３４を備えずに、第１中間ギヤ１５等の他の中間ギヤに規制部３４を備えても良い。
【００４９】
上記の実施形態及び別例から把握できる技術的思想を以下に記載する。
（イ）前記出力軸に、出力軸と一体的に回転する車両用ランプを取付けたことを特徴とする請求項１〜７のいずれか一項に記載のアクチュエータ。
【００５０】
【発明の効果】
以上詳述したように、本発明によれば、アクチュエータを小型化することができる。
【図面の簡単な説明】
【図１】アクチュエータを取付けた車両２の概略平面図。
【図２】アクチュエータの各ギヤの軸に沿って切断した断面図。
【図３】アクチュエータの内部を説明するための平面図。
【図４】第１のハウジングの平面図。
【図５】（ａ）は、第２中間ギヤの側断面図、（ｂ）は、第２中間ギヤの縦断面図。
【図６】従来のアクチュエータの内部を説明するための平面図。
【符号の説明】
１…アクチュエータ、１２…第１のハウジング、１２ａ…第１のハウジングの底部、１２ｂ…第１のハウジングの側壁部、１３…第２のハウジング、１４…駆動ギヤ、１５…第１中間ギヤ、１６…第２中間ギヤ、１７…出力ギヤ、１８…ステッピングモータ、１９…浅底部、１９ａ…浅底部の内側面、２０…深底部、２１…回転軸、２６…出力軸、２７…受壁部、２７ａ…受壁部の平坦面、２８…壁部、３１…第２中間ギヤの大径ギヤ、３３…凹部、３４…規制部、３４ａ…規制部の平坦面。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actuator that rotates an output shaft.
[0002]
[Prior art]
Conventionally, an actuator that controls the irradiation direction of a vehicle lamp has used a brushless motor that provides a driving force for changing the irradiation direction of the vehicle lamp (for example, Patent Document 1).
[0003]
More specifically, the rotating shaft of the brushless motor is drivingly connected to an output shaft attached so that the vehicle lamp rotates integrally through a reduction mechanism, and the rotation of the rotating shaft causes the vehicle lamp to rotate. The irradiation direction is changed.
[0004]
However, the control for rotating the irradiation direction of the vehicle lamp by a predetermined angle requires a sensor for detecting the irradiation direction of the vehicle lamp, which increases the manufacturing cost.
[0005]
Therefore, a method of controlling the irradiation direction of the vehicle lamp by using a stepping motor capable of rotating the rotation shaft by a predetermined angle depending on the number of pulses of the pulse signal is conceivable.
[0006]
FIG. 6 shows an actuator 90 using a stepping motor. In this actuator 90, a gear 92 attached to a rotary shaft 91 of a stepping motor so as to be integrally rotatable is attached to an output shaft 95 via first and second reduction gears 93 and 94. Drive coupled to the output gear 96. The housing 97 of the actuator 90 is provided with a receiving wall 98 that engages with the end 96 a of the output gear 96. A control device (not shown) applies a pulse signal to the stepping motor so that the end 96a of the output gear 96 engages with the receiving wall 98, and then moves the stepping motor forward or backward depending on the traveling direction of the vehicle. A pulse signal is applied so as to rotate. Thus, after the output gear 96 is pressed against the receiving wall 98 to initialize the rotation position of the output shaft 95, the output shaft 95 is moved in the forward direction and the reverse direction by the pulse signal applied according to the traveling direction of the vehicle. , The irradiation direction of a vehicle lamp (not shown) attached to the output shaft 95 is controlled.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-160581
[Problems to be solved by the invention]
By the way, since the driving force transmitted from the rotary shaft 91 of the stepping motor uses the first and second reduction gears 93 and 94, the rotational torque is the largest in the output gear 96 and the output gear 96 receives the output gear. The load when 96 is pressed is large. Therefore, in order to accurately control the rotation direction of the output shaft 95, that is, the irradiation direction of the vehicle lamp, the strength of the output gear 96 and the strength of the receiving wall portion 98 provided in the housing 97 must be ensured. Increasing the thickness of the output gear 96 and the housing 97 leads to an increase in the size of the actuator.
[0009]
The present invention has been made to solve the above problems, and an object thereof is to provide a small actuator.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is an actuator used for controlling a rotation position from a reference position of a member to be rotated attached to an output shaft. The output gear attached to the output shaft through the drive gear and the intermediate gear so as to rotate integrally is reduced and rotated by the stepping motor that rotates based on the rotation, and the intermediate gear and the output gear are placed in the housing. In the actuator accommodated in the shaft support, the intermediate gear and the housing are provided with a restriction portion and a receiving wall portion that are engaged with each other by the rotation of the intermediate gear, and the receiving wall portion and the restriction portion are engaged with each other. The rotation direction of the output shaft is controlled by the pulse signal with the rotation of the output shaft as a reference direction.
[0011]
According to a second aspect of the present invention, the restricting portion is an annular shape formed on the inner diameter side of the disc-shaped gear portion provided in the intermediate gear and along the circumferential direction of the rotation shaft of the gear portion. It is formed in a recess, and the receiving wall portion is formed in such a shape that the intermediate gear can rotate until the tip portion is inserted into the recess and engages with the restricting portion.
[0012]
According to a third aspect of the present invention, the housing includes a first housing in which the receiving wall portion is formed, and a second housing that closes the first housing, and the first housing. The stepping motor was fixed to.
[0013]
According to a fourth aspect of the present invention, the first housing includes a bottom portion and a side wall portion surrounding an outer edge of the bottom portion, and the second housing is a flat plate fixed to the side wall portion of the first housing. The bottom portion of the first housing is composed of a shallow bottom portion and a deep bottom portion having different distances from the second housing, and the distance from the second housing is on the inner surface of the shallow bottom portion shorter than the deep bottom portion. A receiving wall was formed.
[0014]
According to a fifth aspect of the present invention, the receiving wall portion is provided at a corner formed by the wall portion connecting the shallow bottom portion to the deep bottom portion and the shallow bottom portion.
According to a sixth aspect of the present invention, the stepping motor is fixed to the outer surface of the shallow bottom portion.
[0015]
In the invention according to claim 7, the restricting portion and the receiving wall portion have flat surfaces that engage with each other.
(Function)
According to the first aspect of the present invention, the reference direction of the output shaft can be determined by engaging the restricting portion provided in the intermediate gear with the receiving wall portion. For this reason, the load applied to the intermediate gear is smaller than the load applied when the rotation of the output gear having a large rotational torque when it is rotated.
[0016]
According to the second aspect of the present invention, the restricting portion is formed in the recess formed in the intermediate gear, and the receiving wall portion is inserted into the recess, thereby providing the receiving wall portion and the restricting portion in the housing. Space is not required, and the actuator becomes smaller.
[0017]
According to the invention described in claim 3, the stepping motor is fixed to the first housing in which the receiving wall portion is formed. For this reason, since the positional relationship between the first housing and the second housing is not shifted due to an impact when the receiving wall portion and the regulating portion are engaged, the positional relationship between the receiving wall portion and the stepping motor may be shifted. Disappear. For this reason, a reference direction can be determined reliably.
[0018]
According to the invention described in claim 4, since the receiving wall portion is provided in the shallow bottom portion, the protruding width of the receiving wall portion is reduced, and the rigidity of the receiving wall portion is improved. Moreover, the rigidity of the first housing is improved by using the two-stage bottom.
[0019]
According to the invention described in claim 5, since the receiving wall portion is provided at the corner formed by the wall portion and the shallow bottom portion, the rigidity of the receiving wall portion and the first housing is improved.
According to the invention described in claim 6, since the stepping motor is fixed outside the first housing, the stepping motor does not interfere with the arrangement of the various gears, and the various gears can be arranged densely. Moreover, since the stepping motor is attached to the recess formed by the shallow bottom and the wall, the overall length of the actuator is reduced.
[0020]
According to the invention described in claim 7, since the receiving wall portion engages with the flat surface of the restricting portion, the load when engaged is reduced.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view of a vehicle 2 to which an actuator 1 according to this embodiment is attached.
[0022]
A sensor 4 that detects the amount of rotation of the handle 3 is attached to the handle 3 that controls the traveling direction of the vehicle 2, and a control device 5 is connected to the sensor 4. The control device 5 is connected to an actuator 1 that changes the irradiation direction of a vehicle lamp 6 as a pivoted member. The vehicle lamp 6 is attached to the tip of the vehicle 2.
[0023]
FIG. 2 is a cross-sectional view taken along the axis of each gear of the actuator 1 in the present embodiment. FIG. 3 is a plan view for explaining the internal configuration of the actuator 1.
[0024]
The actuator 1 includes a first housing 12 and a second housing 13, in which a drive gear 14, a first intermediate gear 15, a second intermediate gear 16, an output gear 17, and the like are accommodated. A stepping motor 18 is attached to the outside.
[0025]
The first housing 12 includes a substantially rectangular bottom portion 12a and a side wall portion 12b formed so as to extend from the outer edge along the vertical direction to the bottom portion 12a so as to surround the outer edge of the bottom portion 12a. Become. A flat plate-like second housing 13 is attached to the side wall portion 12b so as to close the first housing 12 thus configured. The bottom portion 12a of the first housing 12 has a two-step bottom. That is, the bottom portion 12a of the first housing 12 includes a shallow bottom portion 19 that has a short distance from the second housing 13 to the bottom portion 12a, and a deep bottom portion 20 that has a long distance from the second housing 13 to the bottom portion 12a. ing.
[0026]
A first upper bearing 22 a is fixed to the shallow bottom portion 19, and the rotary shaft 21 of the stepping motor 18 can be rotated by the first upper bearing 22 a and the motor inner bearing 22 b fixed to the bottom of the cup-shaped motor case 11. It is pivotally supported. A second upper bearing 23a is formed on the inner side surface 19a of the shallow bottom portion 19, and a second lower bearing 23b corresponding to the second upper bearing 23a is formed on the second housing 13. The second upper bearing 23a and the second lower bearing 23b pivotally support the first intermediate gear 15 in a rotatable manner. The deep bottom portion 20 is formed with a third upper shaft 24a support, and the second housing 13 is formed with a third lower bearing 24b corresponding to the third upper bearing 24a. 24a and the third lower bearing 24b pivotally support the second intermediate gear 16 in a rotatable manner. The deep bottom portion 20 is formed with a fourth upper bearing 25a, and the second housing 13 is formed with a fourth lower bearing 25b corresponding to the fourth upper bearing 25a. The bearing 25a and the fourth lower bearing 25b pivotally support the output shaft 26 so as to be rotatable.
[0027]
In addition, the shallow bottom portion 19 is formed with a receiving wall portion 27 that extends from the shallow bottom portion 19 toward the second housing 13. As shown in FIG. 4, the receiving wall portion 27 has a sector shape centered on the axis of the third upper bearing 24a, and flat surfaces 27a along the radial direction are formed at both ends in the circumferential direction. Has been. Further, the receiving wall portion 27 is located in the vicinity of the opposite side of the wall portion 28 that connects the shallow bottom portion 19 and the deep bottom portion 20. That is, the receiving wall portion 27 is formed near the corner formed by the shallow bottom portion 19 and the wall portion 28. FIG. 4 is a plan view showing a state when the first housing 12 is viewed from the second housing 13 side.
[0028]
A stepping motor 18 is attached from the outer side surface 19 b of the shallow bottom portion 19. The stepping motor 18 rotates the rotating shaft 21 by a predetermined angle in response to a pulse signal input from the control device 5 shown in FIG. In the present embodiment, the sensor 4 connected to the handle 3 of the vehicle 2 detects the amount of rotation of the handle 3 and transmits the value to the control device 5. Then, the control device 5 outputs a pulse signal so that the rotation shaft 21 of the stepping motor 18 rotates by a predetermined angle in proportion to the rotation amount of the handle 3. That is, by rotating the handle 3, the direction of the vehicle 2 and the irradiation direction of the vehicle lamp 6 are controlled, and the vehicle lamp 6 irradiates the traveling direction of the vehicle 2.
[0029]
The rotation shaft 21 of the stepping motor 18 is rotatably supported by a first upper bearing 22a and a motor inner bearing 22b. A drive gear 14 that rotates integrally with the rotary shaft 21 is provided near the tip of the rotary shaft 21.
[0030]
The first intermediate gear 15 is rotatably supported by a second upper bearing 23a and a second lower bearing 23b. In the first intermediate gear 15, a disk-shaped large-diameter gear 29 and a small-diameter gear 30 are integrally formed, and the large-diameter gear 29 meshes with the drive gear 14.
[0031]
The second intermediate gear 16 is rotatably supported by a third upper bearing 24a and a third lower bearing 24b. The second intermediate gear 16 includes a disk-shaped large-diameter gear 31 and a small-diameter gear 32 integrally formed as a gear portion, and the large-diameter gear 31 meshes with the small-diameter gear 30 of the first intermediate gear 15. ing.
[0032]
As shown in FIGS. 5A and 5B, an annular recess 33 is formed on the inner diameter side of the large diameter gear 31 of the second intermediate gear 16. And the control part 34 is protrudingly provided so that it may extend along the axial direction from the bottom part of this recessed part 33. As shown in FIG. As shown in FIG. 5B, the restricting portion 34 is formed in a sector shape centered on the axis of the second intermediate gear 16, and flat surfaces 34a along the radial direction are formed at both ends in the circumferential direction. Is formed.
[0033]
As shown in FIG. 2, the second intermediate gear 16 configured as described above is attached so that the recess 33 faces the bottom 12a of the first housing 12, and the third upper bearing 24a and the third lower gear 16 It is pivotally supported by the side bearing 24b. At this time, the receiving wall portion 27 provided in the shallow bottom portion 19 is inserted into the concave portion 33 so as to engage with the regulating portion 34 in the circumferential direction.
[0034]
That is, the receiving wall portion 27 has a fan shape in accordance with the shape of the concave portion 33, and further protrudes so that the tip end portion can be engaged with the regulating portion 34 formed in the concave portion 33. Further, the width from the outer diameter surface to the inner diameter surface of the receiving wall portion 27 is formed smaller than the width from the outer diameter surface to the inner diameter surface of the recess 33. Therefore, in the second intermediate gear 16, the flat surface 34 a of the restricting portion 34 protruding from the concave portion 33 is engaged with the flat surface 27 a of the receiving wall portion 27 in a state where the receiving wall portion 27 is inserted into the concave portion 33. It can be rotated until
[0035]
A fourth lower bearing 25b is formed in the second housing 13 corresponding to the fourth upper bearing 25a formed in the deep bottom portion 20, and an output is generated by the fourth upper bearing 25a and the fourth lower bearing 25b. The shaft 26 is rotatably supported. The output shaft 17 is formed integrally with the output gear 17. The output gear 17 has an output gear portion 17 a formed in an arc shape, and the output gear portion 17 a meshes with the small diameter gear 32 of the second intermediate gear 16. Further, the distal end of the output shaft 26 protrudes from the first housing 12, and the vehicle lamp 6 is connected to the distal end so as to rotate integrally.
[0036]
At one end of the output shaft 26 that does not protrude from the first housing 12, a cylindrical housing recess 35 centering on the axis of the output shaft 26 is formed. A cylindrical ring 36 is accommodated in the accommodating recess 35. The ring 36 is fixed by a caulking portion 35 a formed at the opening end of the receiving recess 35. A pair of opposing magnets 37 are fixed to the inner peripheral surface of the ring 36. A magnetic sensor 38 fixed to the second housing 13 is disposed at the center of the ring 36, that is, at the center of the output shaft 26. The magnetic sensor 38 measures the amount of magnetic flux generated by the magnet 37 and detects the position of the output gear 17, that is, the irradiation direction of the vehicle lamp 6 based on the change in the amount of magnetic flux. This magnetic sensor 38 is used to confirm whether or not the stepping motor 18 has stepped out when the vehicle lamp 6 is directed in the reference direction, and whether or not the vehicle lamp 6 has been directed in the reference direction. used.
[0037]
Here, a method for controlling the irradiation direction of the vehicle lamp 6 will be described.
Prior to moving the handle 3 of the vehicle 2 to control the vehicle 2 and the vehicle lamp 6, the control device 5 outputs a pulse signal for initial setting to the stepping motor 18. The stepping motor 18 receives the pulse signal from the control device 5 and rotates the rotating shaft 21. The drive gear 14 rotates together with the rotating shaft 21, and the first intermediate gear 15 and the second intermediate gear 16 rotate in conjunction with the rotation. Then, the second intermediate gear 16 rotates the second intermediate gear 16 until the restricting portion 34 provided on the second intermediate gear 16 is restricted in its rotational movement by the receiving wall portion 27. At this time, since the output gear 17 meshes with the small-diameter gear 32 of the second intermediate gear 16, when the second intermediate gear 16 rotates by a predetermined angle, the output shaft 26 and the vehicle lamp 6 are interlocked with the movement. Also rotate a predetermined angle. For this reason, the output shaft 26 and the vehicle lamp 6 rotate until the restricting portion 34 of the second intermediate gear 16 is engaged with the receiving wall portion 27. The control device 5 confirms whether or not the irradiation direction of the vehicle lamp 6 is directed to the reference direction by the magnetic sensor 38 after outputting the pulse signal for performing the initial setting, and determines whether or not the initial setting is completed. to decide.
[0038]
If the control device 5 stores the irradiation direction of the vehicle lamp 6 when the restricting portion 34 and the receiving wall portion 27 are engaged in the control device 5 in advance as a reference direction, the control device 5 may perform the reference direction after the initial setting. The vehicle lamp 6 can be controlled to be directed in a designated direction by outputting a pulse signal for rotating the vehicle at a predetermined angle. That is, the control device 5 can output a pulse signal to the actuator 1 based on the rotation angle of the handle 3 of the vehicle 2, and change the irradiation direction of the vehicle lamp 6 in accordance with the traveling direction of the vehicle 2.
[0039]
As described above in detail, the present embodiment has the following features.
(1) The first housing 12 is provided with a receiving wall portion 27, and the regulating portion 34 provided on the second intermediate gear 16 is pressed against the receiving wall portion 27, so that the reference direction of the output shaft 26, that is, the vehicle An irradiation direction as a reference of the lamp 6 is determined. Since the rotational torque of the second intermediate gear 16 is smaller than the rotational torque of the output gear 17, the load when the restricting portion 34 is pressed against the receiving wall portion 27 is smaller than the conventional load. That is, it is not necessary to increase the rigidity of the strength of the receiving wall portion 27 and the restricting portion 34. For this reason, the 1st housing 12, the output gear 17, and the 2nd intermediate gear 16 can be reduced in size, and the actuator 1 can be reduced in size.
[0040]
(2) Since the restricting portion 34 is provided in the recessed portion 33 of the second intermediate gear 16 and the receiving wall portion 27 is inserted into the recessed portion 33, an extra space is provided for providing the receiving wall portion 27 and the restricting portion 34. Therefore, the actuator 1 can be reduced in size.
[0041]
(3) The stepping motor 18 is fixed to the first housing 12 provided with the receiving wall portion 27. For this reason, when the stepping motor 18 is attached to the second housing 13 and the restricting portion 34 is pressed against the receiving wall portion 27, the first housing 12 and the second housing 13 generated by the impact when pressed Prevents deviation. For this reason, when performing the initial setting, the irradiation direction of the vehicle lamp 6 can be surely directed to the reference direction.
[0042]
(4) Since the bottom portion 12a of the first housing 12 is stepped, the rigidity of the first housing 12 itself can be improved. Further, since the receiving wall portion 27 is provided on the shallow bottom portion 19, the protruding length of the receiving wall portion 27 can be made shorter than when the receiving wall portion 27 is provided, and the rigidity of the receiving wall portion 27 is improved. To do. In addition, since the receiving wall portion 27 is provided in the vicinity of the wall portion 28 that connects the deep bottom portion 20 and the shallow bottom portion 19, the rigidity of the receiving wall portion 27 is improved. For this reason, the first housing 12 can be reduced in size while ensuring the rigidity of the first housing 12 and the receiving wall portion 27.
[0043]
(5) The stepping motor 18 is fixed to the outer side surface 19 b of the shallow bottom portion 19. For this reason, without interfering with the stepping motor 18, various gears can be arranged without leaving an extra space, and the actuator 1 can be downsized. Moreover, since it fixed to the outer side surface 19b of the shallow bottom part 19, the full length of the actuator 1 can be shortened and the actuator 1 can be reduced in size.
[0044]
(6) The restricting portion 34 has a fan shape centered on the axis of the second intermediate gear 16, and is flat against the flat surface 27a of the receiving wall portion 27 along the radial direction at both ends in the circumferential direction. A surface 34a is provided. By engaging the flat surfaces 27a and 34a, the surface pressure when engaged is reduced, and the load generated between the receiving wall portion 27 and the restricting portion 34 can be reduced. For this reason, durability of the receiving wall part 27 and the control part 34 can be improved. Further, since the restricting portion 34 and the receiving wall portion 27 are fan-shaped, the rotation range of the vehicle lamp 6 can be determined based on the circumferential length thereof.
[0045]
In addition to the above, it can be embodied in the following form.
In the above embodiment, a pair of receiving wall portions that restrict the output gear 17 to rotate within a predetermined rotation range determined in advance may be provided at both ends of the output gear 17.
[0046]
In the above embodiment, when turning the output shaft 26 in the reference direction, it is used to confirm whether or not the stepping motor 18 has stepped out and whether or not the output shaft 26 has been directed in the reference direction. Although the magnetic sensor 38 is provided, it may not be provided. In this case as well, the same effect as in the above embodiment can be obtained.
[0047]
In the above embodiment, the regulating portion 34 and the receiving wall portion 27 are provided with the flat surfaces 34a and 27a, respectively. However, if the regulating portion 34 is always engaged with the receiving wall portion 27 at a fixed place, the flat surface 34a, It does not have to be 27a.
[0048]
In the above embodiment, in order to transmit the driving force of the driving gear 14 to the output gear 17, two gears, the first intermediate gear 15 and the second intermediate gear 16, are used. A driving force may be transmitted to the output gear 17. Further, the driving force of the driving gear 14 may be transmitted to the output gear 17 through one gear. In this case, the second intermediate gear 16 may not be provided with the restriction portion 34, but the other intermediate gear such as the first intermediate gear 15 may be provided with the restriction portion 34.
[0049]
The technical ideas that can be grasped from the above embodiment and other examples will be described below.
(A) The actuator according to any one of claims 1 to 7, wherein a vehicular lamp that rotates integrally with the output shaft is attached to the output shaft.
[0050]
【The invention's effect】
As described above in detail, according to the present invention, the actuator can be miniaturized.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a vehicle 2 to which an actuator is attached.
FIG. 2 is a cross-sectional view taken along the axis of each gear of the actuator.
FIG. 3 is a plan view for explaining the inside of the actuator.
FIG. 4 is a plan view of a first housing.
5A is a side sectional view of a second intermediate gear, and FIG. 5B is a longitudinal sectional view of a second intermediate gear.
FIG. 6 is a plan view for explaining the inside of a conventional actuator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Actuator, 12 ... 1st housing, 12a ... Bottom part of 1st housing, 12b ... Side wall part of 1st housing, 13 ... 2nd housing, 14 ... Drive gear, 15 ... 1st intermediate | middle gear, 16 2nd intermediate gear, 17 ... Output gear, 18 ... Stepping motor, 19 ... Shallow bottom, 19a ... Shallow bottom inner surface, 20 ... Deep bottom, 21 ... Rotating shaft, 26 ... Output shaft, 27 ... Receiving wall, 27a: flat surface of the receiving wall portion, 28 ... wall portion, 31 ... large diameter gear of the second intermediate gear, 33 ... concave portion, 34 ... regulating portion, 34a ... flat surface of the regulating portion.

Claims (7)

出力軸に取着される被回動部材の基準位置からの回動位置を制御するために用いられるアクチュエータであって、
パルス信号に基づいて回動駆動するステッピングモータにより駆動ギヤ及び中間ギヤを介して前記出力軸に一体回動可能に取着された出力ギヤが減速回動され、前記中間ギヤ及び前記出力ギヤがハウジング内に軸支収容されたアクチュエータにおいて、
前記中間ギヤ及び前記ハウジングには、該中間ギヤ回動により互いに係合する規制部及び受壁部が備えられ、
前記受壁部と前記規制部とが係合したときの前記出力軸の回動を基準方向として、前記出力軸の回動方向が前記パルス信号により制御されることを特徴とするアクチュエータ。An actuator used to control a rotation position from a reference position of a rotated member attached to an output shaft,
An output gear attached to the output shaft so as to rotate integrally with the output shaft via a drive gear and an intermediate gear is decelerated and rotated by a stepping motor that rotates based on a pulse signal, and the intermediate gear and the output gear are housings. In the actuator accommodated in the shaft,
The intermediate gear and the housing are provided with a restricting portion and a receiving wall portion that are engaged with each other by the rotation of the intermediate gear,
The actuator, wherein the rotation direction of the output shaft is controlled by the pulse signal, with the rotation of the output shaft when the receiving wall portion and the restricting portion are engaged as a reference direction. 前記規制部は、前記中間ギヤに備えられた円盤状のギヤ部の内径側であって該ギヤ部の回動軸の周方向に沿って形成された環状の凹部内に形成されており、
前記受壁部は、その先端部分が前記凹部に挿入され、かつ、前記規制部と係合するまで前記中間ギヤが回転可能な形状に形成されたことを特徴とする請求項１に記載のアクチュエータ。The restricting portion is formed on an inner diameter side of a disc-like gear portion provided in the intermediate gear and in an annular recess formed along a circumferential direction of a rotation shaft of the gear portion,
2. The actuator according to claim 1, wherein the receiving wall portion is formed in a shape that allows the intermediate gear to rotate until a tip portion thereof is inserted into the concave portion and engages with the restriction portion. . 前記ハウジングは、前記受壁部が形成された第１のハウジングと、前記第１のハウジングを閉塞する第２のハウジングと、から構成され、前記第１のハウジングに前記ステッピングモータを固定したことを特徴とする請求項１又は２に記載のアクチュエータ。The housing includes a first housing in which the receiving wall portion is formed, and a second housing that closes the first housing, and the stepping motor is fixed to the first housing. The actuator according to claim 1 or 2, characterized in that: 前記第１のハウジングは、底部とその底部の外縁を囲む側壁部とからなり、前記第２のハウジングは、前記第１のハウジングの側壁部に固定される平板からなり、前記第１のハウジングの底部は、前記第２のハウジングからの距離が異なる浅底部と深底部とからなり、第２のハウジングからの距離が深底部より短い浅底部の内側面に前記受壁部を形成したことを特徴とする請求項１〜３のいずれか一項に記載のアクチュエータ。The first housing includes a bottom portion and a side wall portion surrounding an outer edge of the bottom portion, and the second housing includes a flat plate fixed to the side wall portion of the first housing. The bottom portion is composed of a shallow bottom portion and a deep bottom portion having different distances from the second housing, and the receiving wall portion is formed on the inner surface of the shallow bottom portion whose distance from the second housing is shorter than the deep bottom portion. The actuator according to any one of claims 1 to 3. 前記受壁部は、前記浅底部から前記深底部までを繋ぐ壁部と前記浅底部により形成される角に備えられたことを特徴とする請求項４に記載のアクチュエータ。The actuator according to claim 4, wherein the receiving wall portion is provided at a corner formed by a wall portion connecting the shallow bottom portion to the deep bottom portion and the shallow bottom portion. 前記浅底部の外側面に前記ステッピングモータを固定したことを特徴とする請求項４又は５に記載のアクチュエータ。The actuator according to claim 4 or 5, wherein the stepping motor is fixed to an outer surface of the shallow bottom portion. 前記規制部と前記受壁部は、その係合する面を平坦面にしたことを特徴とする請求項１〜６のいずれか一項に記載のアクチュエータ。The actuator according to any one of claims 1 to 6, wherein the restricting portion and the receiving wall portion have flat surfaces engaged with each other.
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