JP2009197922A

JP2009197922A - Linear driver

Info

Publication number: JP2009197922A
Application number: JP2008040762A
Authority: JP
Inventors: Akio Iwami; 昭夫石水
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2008-02-22
Filing date: 2008-02-22
Publication date: 2009-09-03

Abstract

PROBLEM TO BE SOLVED: To provide a linear driver with a reduced number of components even when a position detecting mechanism is provided by using a mechanism component. SOLUTION: In the linear driver 1, a top dead center detecting concave part 72 and a bottom dead center detecting concave part 71 are formed at prescribed positions in the axial direction on the outer peripheral face of an output member 7, a bottom dead center detecting lever 86 and a top dead center detecting lever 87 are displaced in the same plane by the concave parts 72, 71, and the displacement of the levers 86, 87 is detected by a bottom dead center detecting proximity switch 81 and a top dead center detecting proximity switch 82 (switches). A common tensile coil spring 89 is used upon biasing the bottom dead center detecting lever 86 and the top dead center detecting lever 87 so that the levers 86, 87 abut on the outer peripheral face of the output member 7. COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、送りねじ機構により出力部材を直動させるリニア駆動装置に関するものである。 The present invention relates to a linear drive device that linearly moves an output member by a feed screw mechanism.

送りねじ機構により出力部材を直動させるリニア駆動装置において、駆動始点および駆動終点の信号を検出してモータを停止させるにあたっては、出力部材に磁石を搭載するとともに、始点位置および終点位置の各々に磁気センサを設けた構成が採用されている（例えば、特許文献１参照）。
特開２００２−３７４６５２号公報 In the linear drive device that linearly moves the output member by the feed screw mechanism, when detecting the signal of the drive start point and the drive end point and stopping the motor, the output member is mounted with a magnet and at each of the start point position and the end point position. A configuration provided with a magnetic sensor is employed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-374652

しかしながら、使用環境などの制約から磁気センサを用いることができない場合において、特許文献１に開示の位置検出機構のように、始点位置および終点位置の各々位置検出機構を設けると、部品点数が増えるため、リニア駆動装置の小型化、および低コスト化を図ることが困難になるという問題点がある。 However, in the case where the magnetic sensor cannot be used due to restrictions such as the use environment, if the position detection mechanism for each of the start point position and the end point position is provided like the position detection mechanism disclosed in Patent Document 1, the number of parts increases. However, there is a problem that it is difficult to reduce the size and cost of the linear drive device.

以上の問題点に鑑みて、本発明の課題は、機構部品を用いて位置検出機構を設ける場合でも、少ない部品点数で済むリニア駆動装置を提供することにある。 In view of the above problems, an object of the present invention is to provide a linear drive device that requires only a small number of parts even when a position detection mechanism is provided using mechanical parts.

上記課題を解決するために、本発明の第１の形態では、モータと、出力部材と、前記モータの回転出力を、前記出力部材を直動させる力に変換する変換機構と、を有するリニア駆動装置において、前記出力部材の軸線方向の位置を検出する位置検出機構を有し、当該位置検出機構は、前記出力部材の外周面に当接して当該出力部材の外周面の軸線方向の所定位置に形成された凹凸により変位する複数の位置検出用可動部材と、該複数の位置検出用可動部材の各々の変位を検出するスイッチと、前記複数の位置検出用可動部材を前記出力部材に当接するように付勢する付勢手段とを備え、当該付勢手段は、前記複数の位置検出用可動部材の各々に付勢力を印加する共通の付勢部材であることを特徴とする。 In order to solve the above problems, in the first aspect of the present invention, a linear drive having a motor, an output member, and a conversion mechanism that converts the rotational output of the motor into a force that linearly moves the output member. The apparatus includes a position detection mechanism that detects a position of the output member in the axial direction, and the position detection mechanism is in contact with the outer peripheral surface of the output member and is positioned at a predetermined position in the axial direction of the outer peripheral surface of the output member. A plurality of position detecting movable members that are displaced by the formed unevenness, a switch that detects the displacement of each of the plurality of position detecting movable members, and the plurality of position detecting movable members are in contact with the output member The urging means is a common urging member that applies an urging force to each of the plurality of position detecting movable members.

本発明では、機構部品を用いて出力部材の位置検出を行なうにあたって、出力部材の外周面には軸線方向の所定位置に凹凸を形成するとともに、かかる凹凸により位置検出用可動部材を変位させ、かかる位置検出用可動部材の変位をスイッチで検出する。ここで、位置検出用可動部材に対しては出力部材の外周面に常に当接するように付勢する必要があり、かかる付勢を行なうにあたって、本発明では、共通の付勢部材を用いる。このため、部品点数の削減を図ることができる。 In the present invention, when detecting the position of the output member using the mechanical component, the outer peripheral surface of the output member is formed with irregularities at predetermined positions in the axial direction, and the position detecting movable member is displaced by the irregularities. The displacement of the position detecting movable member is detected by a switch. Here, it is necessary to urge the movable member for position detection so as to always abut against the outer peripheral surface of the output member. In performing the urging, a common urging member is used in the present invention. For this reason, the number of parts can be reduced.

本発明の第２の形態では、モータと、出力部材と、前記モータの回転出力を、前記出力部材を直動させる力に変換する変換機構と、を有するリニア駆動装置において、前記出力部材の軸線方向の位置を検出する位置検出機構を有し、当該位置検出機構は、前記出力部材の外周面に当接して当該出力部材の外周面の軸線方向の所定位置に形成された凹凸により変位する複数の位置検出用可動部材と、該複数の位置検出用可動部材の各々の変位を検出するスイッチと、前記複数の位置検出用可動部材を前記出力部材に当接するように付勢する付勢手段とを備え、前記複数の位置検出用可動部材は、同一の平面上で変位することを特徴とする。 According to a second aspect of the present invention, in the linear drive device that includes a motor, an output member, and a conversion mechanism that converts the rotational output of the motor into a force that linearly moves the output member, the axis of the output member A position detecting mechanism for detecting a position in the direction, the position detecting mechanism being in contact with the outer peripheral surface of the output member and being displaced by irregularities formed at predetermined positions in the axial direction of the outer peripheral surface of the output member. A position detecting movable member, a switch for detecting a displacement of each of the plurality of position detecting movable members, and a biasing means for biasing the plurality of position detecting movable members so as to contact the output member. The plurality of position detecting movable members are displaced on the same plane.

本発明では、機構部品を用いて出力部材の位置検出を行なうにあたって、出力部材の外周面には軸線方向の所定位置に凹凸を形成するとともに、かかる凹凸により位置検出用可動部材を変位させ、かかる位置検出用可動部材の変位をスイッチで検出する。ここで、位置検出用可動部材については複数設ける必要があり、かかる複数の位置検出用可動部材については同一の平面上で変位するように構成してある。このため、複数の位置検出用可動部材に所定の変位を行なわせるためのガイドや支持を行う場合でも、その構成を簡素化することができるので、部品点数の削減を図ることができる。 In the present invention, when detecting the position of the output member using the mechanical component, the outer peripheral surface of the output member is formed with irregularities at predetermined positions in the axial direction, and the position detecting movable member is displaced by the irregularities. The displacement of the position detecting movable member is detected by a switch. Here, it is necessary to provide a plurality of movable members for position detection, and the plurality of movable members for position detection are configured to be displaced on the same plane. For this reason, even when a guide or support for causing a plurality of position detection movable members to perform a predetermined displacement is performed, the configuration can be simplified, and the number of parts can be reduced.

本発明の第２の形態では、前記スイッチは剛性基板上に搭載され、前記複数の位置検出用可動部材は、当該剛性基板の基板面に沿うように変位することが好ましい。このように構成すると、スイッチの配置と、複数の位置検出用可動部材のガイドおよび支持を共通の剛性基板を行なうことができるので、部品点数の削減を図ることができる。 In the second aspect of the present invention, it is preferable that the switch is mounted on a rigid substrate, and the plurality of position detecting movable members are displaced along the substrate surface of the rigid substrate. If comprised in this way, since a common rigid board | substrate can be performed for arrangement | positioning of a switch, and the guide and support of several movable members for position detection, it can aim at reduction of a number of parts.

本発明では、第１の形態と第２の形態とを組み合わせることが好ましい。すなわち、本発明の第２の形態において、前記付勢手段は、前記複数の位置検出用可動部材の各々に付勢力を印加する共通の付勢部材であることが好ましい。このように構成すると、少ない部品点数で複数の位置検出用可動部材を出力部材の外周面に常に当接するように構成することができる。 In the present invention, it is preferable to combine the first form and the second form. That is, in the second aspect of the present invention, it is preferable that the urging means is a common urging member that applies an urging force to each of the plurality of position detecting movable members. If comprised in this way, it can comprise so that the several movable member for position detection may always contact | abut to the outer peripheral surface of an output member with few components.

本発明において、前記複数の位置検出用可動部材は各々、支点周りに回転可能なレバーを用いることができる。このように構成すると、位置検出用可動部材が直動する場合に比較して、位置検出用可動部材を変位可能に配置するのに必要なスペースが狭く済む。それ故、リニア駆動装置の小型化を図ることができる。 In the present invention, each of the plurality of position detecting movable members can be a lever that can rotate around a fulcrum. If comprised in this way, compared with the case where the movable member for position detection moves linearly, the space required for arrange | positioning the movable member for position detection so that a displacement is possible will be small. Therefore, the linear drive device can be reduced in size.

本発明において、前記複数の位置検出用可動部材は、前記出力部材の軸線と直交する平面内で変位可能に２つ配置され、当該２つの位置検出用可動部材は、前記付勢手段によって前記出力部材の中心軸線に向けて付勢され、かつ、前記出力部材の外周面のうち、当該出力部材の中心軸線に対して点対称位置に当接していることが好ましい。このように構成すると、出力部材の中心軸線を挟む両側に位置検出用可動部材を対称に配置すればよいので、共通の付勢部材を用いて出力部材を付勢する場合でも、同等の付勢力を容易に印加することができる。また、２つの位置検出用可動部材に同等の付勢力を印加すれば、出力部材に偏った力が加わらないので、出力部材の移動がスムーズである。 In the present invention, the plurality of position detection movable members are arranged so as to be displaceable within a plane orthogonal to the axis of the output member, and the two position detection movable members are output by the biasing means. It is preferable that the member is biased toward the central axis of the member and abuts at a point symmetrical position with respect to the central axis of the output member on the outer peripheral surface of the output member. With this configuration, since the position detection movable members may be arranged symmetrically on both sides of the center axis of the output member, even when the output member is biased using a common biasing member, the same biasing force Can be easily applied. Further, if the same urging force is applied to the two movable members for position detection, a biased force is not applied to the output member, so that the output member moves smoothly.

本発明では、機構部品を用いて出力部材の位置検出を行なうにあたって、出力部材の外周面には軸線方向の所定位置に凹凸を形成するとともに、かかる凹凸により位置検出用可動部材を変位させ、かかる位置検出用可動部材の変位をスイッチで検出する。ここで、位置検出用可動部材に対しては出力部材の外周面に常に当接するように付勢する必要があり、かかる付勢を行なうにあたって、本発明の第１の形態では、共通の付勢部材を用いる。このため、部品点数の削減を図ることができる。また、本発明の第２の形態では、複数の位置検出用可動部材については同一の平面上で変位するように構成してあるため、複数の位置検出用可動部材に所定の変位を行なわせるためのガイドや支持を行う場合でも、その構成を簡素化することができるので、部品点数の削減を図ることができる。 In the present invention, when detecting the position of the output member using the mechanical component, the outer peripheral surface of the output member is formed with irregularities at predetermined positions in the axial direction, and the position detecting movable member is displaced by the irregularities. The displacement of the position detecting movable member is detected by a switch. Here, it is necessary to urge the movable member for position detection so as to always contact the outer peripheral surface of the output member. In performing the urging, in the first embodiment of the present invention, a common urging is performed. Use members. For this reason, the number of parts can be reduced. In the second embodiment of the present invention, the plurality of position detecting movable members are configured to be displaced on the same plane, so that the plurality of position detecting movable members are caused to perform predetermined displacement. Even in the case of performing the guide and support, the configuration can be simplified, so that the number of parts can be reduced.

以下に、図面を参照して、本発明を適用したリニア駆動装置を説明する。 A linear drive device to which the present invention is applied will be described below with reference to the drawings.

（全体構成）
図１は、本発明を適用したリニア駆動装置から上ケースを外してその内部構造を示す斜視図である。図２（ａ）、（ｂ）は、本発明を適用したリニア駆動装置の主要部を抜き出して、斜め下方からみた斜視図、および当該リニア駆動装置の縦断面図である。 (overall structure)
FIG. 1 is a perspective view showing the internal structure of the linear drive device to which the present invention is applied by removing the upper case. 2A and 2B are a perspective view of the main part of the linear drive device to which the present invention is applied, seen from obliquely below, and a longitudinal sectional view of the linear drive device.

図１および図２（ａ）、（ｂ）に示すリニア駆動装置１は、軸状の出力部材７をその軸線方向Ｌ１に直線的に往復駆動するためのモータ装置であり、下ケース２１の内側には、駆動源としてのモータ３と、このモータ３の回転出力を、出力部材７を直動させる力に変換する変換機構１０とを有している。下ケース２１は、出力部材７の軸線Ｌ１と平行な方向に延びた円筒部分２１１と、この円筒部分２１１から側方に張り出した矩形筒部分２１２とを備えており、矩形筒部分２１２と円筒部分２１２とは内部が連通している。 The linear drive device 1 shown in FIG. 1 and FIGS. 2A and 2B is a motor device for linearly reciprocatingly driving the shaft-like output member 7 in the axial direction L1. 1 includes a motor 3 as a drive source and a conversion mechanism 10 that converts the rotational output of the motor 3 into a force that causes the output member 7 to move linearly. The lower case 21 includes a cylindrical portion 211 extending in a direction parallel to the axis L1 of the output member 7, and a rectangular tube portion 212 projecting laterally from the cylindrical portion 211. The rectangular tube portion 212 and the cylindrical portion The inside communicates with 212.

下ケース２１において、矩形筒部分２１２の底部近くには、モータ３がモータ軸３１を水平方向に向けて配置されており、モータ軸３１には駆動側斜歯歯車３１０が固着されている。また、下ケース２１において矩形筒部分２１２の内側には、伝達車４が出力部材７の軸線Ｌ１に平行な軸線Ｌ２周りに回転可能に配置されている。また、下ケース２１において、円筒部分２１１の内側には、伝達車４と隣接する位置に有底円筒状の筒状回転部材５が出力部材７の軸線Ｌ１周りに回転可能に配置されており、この筒状回転部材５の内側に出力部材７が下端側から挿入されている。 In the lower case 21, near the bottom of the rectangular tube portion 212, the motor 3 is arranged with the motor shaft 31 oriented in the horizontal direction, and a drive-side inclined gear 310 is fixed to the motor shaft 31. In the lower case 21, the transmission wheel 4 is disposed on the inner side of the rectangular tube portion 212 so as to be rotatable around an axis L 2 parallel to the axis L 1 of the output member 7. Further, in the lower case 21, a cylindrical rotating member 5 having a bottomed cylindrical shape is disposed inside the cylindrical portion 211 so as to be rotatable around the axis L 1 of the output member 7 at a position adjacent to the transmission wheel 4. The output member 7 is inserted into the cylindrical rotating member 5 from the lower end side.

上ケース２２の上側には、平板状の軸受部材６、および上ケース２２が順に重ねて配置されており、上ケース２２は、下ケース２１との間に軸受部材６を挟んだ状態で下ケース２１にねじにより止められている。なお、軸受部材６と上ケース２２との間には、出力部材７の回りを囲む空間が形成されており、かかる空間内には、後述する位置検出機構８が配置されている。 A flat plate-like bearing member 6 and an upper case 22 are arranged in this order on the upper side of the upper case 22, and the upper case 22 is in a state where the bearing member 6 is sandwiched between the lower case 21 and the lower case 21. 21 is fixed with a screw. A space surrounding the output member 7 is formed between the bearing member 6 and the upper case 22, and a position detection mechanism 8 described later is disposed in the space.

このように構成したリニア駆動装置１において、伝達車４では、その下端側に形成された大径部分４１の外周面に、駆動側斜歯歯車３１０と噛合する従動側斜歯歯車４１０が形成されており、その上端側外周面４２には外歯歯車４２０が形成されている。 In the linear drive device 1 configured as described above, in the transmission wheel 4, a driven-side inclined gear 410 that meshes with the driving-side inclined gear 310 is formed on the outer peripheral surface of the large-diameter portion 41 formed on the lower end side thereof. An external gear 420 is formed on the outer peripheral surface 42 at the upper end side.

（筒状回転部材５の構成）
筒状回転部材５は、有底筒状であり、上端側（一方側）には、出力部材７が貫通する開口部５１が形成されている。また、筒状回転部材５の外底部の中央部分には、下方に向けて張り出した膨出部分５６が形成されている。かかる膨出部分５６には、下ケース２１の底部から上方に突出した半球状のスラスト軸受部２１１ａが当接しており、筒状回転部材５の下端側がスラスト方向に支持されている。また、下ケース２１の底部では、半球状のスラスト軸受部２１１ａの周りに円筒状突起２１１ｃが上方に突出しており、円筒状突起２１１ｃは、筒状回転部材５の外底部の外周側に形成されている円環状の平坦部のうち、膨出部分５６との環状の境界部分に当接し、筒状回転部材５の下端側をラジアル方向で支持している。 (Configuration of cylindrical rotating member 5)
The cylindrical rotating member 5 has a bottomed cylindrical shape, and an opening 51 through which the output member 7 passes is formed on the upper end side (one side). Further, a bulging portion 56 projecting downward is formed at the central portion of the outer bottom portion of the cylindrical rotating member 5. A hemispherical thrust bearing portion 211a protruding upward from the bottom portion of the lower case 21 is in contact with the bulging portion 56, and the lower end side of the cylindrical rotating member 5 is supported in the thrust direction. Further, at the bottom of the lower case 21, a cylindrical projection 211 c protrudes upward around the hemispherical thrust bearing portion 211 a, and the cylindrical projection 211 c is formed on the outer peripheral side of the outer bottom portion of the cylindrical rotating member 5. Of the annular flat portion, the ring-shaped flat portion is in contact with an annular boundary portion with the bulging portion 56 and supports the lower end side of the cylindrical rotating member 5 in the radial direction.

筒状回転部材５は、その軸線Ｌ１方向の上端側に下端側よりも外径寸法が大きな大径部分５２が形成されており、かかる大径部分５２の外周面には、伝達車４の上端側外周面４２に形成された外歯歯車４２０と噛合する外歯歯車５２０（歯車部）が形成されている。 The cylindrical rotating member 5 has a large diameter portion 52 having an outer diameter larger than that of the lower end side at the upper end side in the direction of the axis L1, and the upper end of the transmission wheel 4 is formed on the outer peripheral surface of the large diameter portion 52. An external gear 520 (gear portion) that meshes with the external gear 420 formed on the side outer peripheral surface 42 is formed.

筒状回転部材５の上端側において、大径部分５２の内周部分に相当する領域のうち、径方向からみたときに外歯歯車５２０と重なる位置には、開口部５１の縁に沿うように環状段部５４が形成されており、かかる環状段部５４によって、筒状回転部材５の上端側内周面には、筒状回転体５の軸線Ｌ１方向と平行な内周壁部分５４１と、筒状回転体５の軸線Ｌ１方向と直交する環状壁部分５４２とが形成されている。 On the upper end side of the cylindrical rotating member 5, in a region corresponding to the inner peripheral portion of the large-diameter portion 52, the position overlapping the external gear 520 when viewed from the radial direction is along the edge of the opening 51. An annular step portion 54 is formed, and by the annular step portion 54, an inner peripheral wall portion 541 parallel to the direction of the axis L 1 of the cylindrical rotating body 5 is formed on the upper end side inner peripheral surface of the cylindrical rotating member 5. An annular wall portion 542 that is orthogonal to the direction of the axis L1 of the cylindrical rotating body 5 is formed.

ここで、軸受部材６には、出力部材７が貫通する穴６５が形成されているとともに、穴６５の周囲から下方に向けては、肉厚の円筒状突起６１が形成されている。円筒状突起６１は、その外周面６１１が筒状回転部材５の内周壁部分５４１に当接して筒状回転部材５の上端側をラジアル方向で支持している。また、筒状回転体５の上端面、すなわち、大径部分５２の上端面には環状突起５２５が形成されており、かかる環状突起５２５は、軸受部材６の下端面に当接している。このようにして、軸受部材６は、筒状回転部材５に対して軸方向で当接して、筒状回転体５の上端面をスラスト方向で支持している。 Here, a hole 65 through which the output member 7 passes is formed in the bearing member 6, and a thick cylindrical protrusion 61 is formed from the periphery of the hole 65 downward. The cylindrical projection 61 has an outer peripheral surface 611 that abuts against an inner peripheral wall portion 541 of the cylindrical rotating member 5 and supports the upper end side of the cylindrical rotating member 5 in the radial direction. An annular projection 525 is formed on the upper end surface of the cylindrical rotating body 5, that is, the upper end surface of the large diameter portion 52, and the annular projection 525 is in contact with the lower end surface of the bearing member 6. In this way, the bearing member 6 is in contact with the cylindrical rotating member 5 in the axial direction, and supports the upper end surface of the cylindrical rotating body 5 in the thrust direction.

（変換機構の構成）
このように構成したリニア駆動装置１において、モータ３の水平軸線Ｌ５周りの回転は、モータ軸３１に固着された駆動側斜歯歯車３１０および伝達車４１の従動側斜歯歯車４１０を介して伝達車４に伝達され、伝達車４の垂直な軸線Ｌ２周りの回転は、外歯歯車４２０および筒状回転体５の外歯歯車５２０を介して、筒状回転体５に伝達される。ここで、筒状回転体５の内周面には雌ねじ７０が形成されている一方、モータ軸３１の下端側では外周面に雄ねじ５０が形成されており、雄ねじ５０と雌ねじ７０が噛合している。また、軸受部材６に形成された穴６５（伴周り阻止部）は小判状の長穴６５形状であり、出力部材７において穴６５を貫通する部分を含めて上半部の略全体は、断面が小判状の長丸形状である。このため、出力部材７は、軸線Ｌ１方向への移動は可能であるが、軸線Ｌ１周りの回転が阻止されている。従って、筒状回転体５が軸線Ｌ１周りに回転すると、かかる回転は、雌ねじ７０から雄ねじ５０に伝達される際、出力部材７を軸線Ｌ１方向に直動させる力として作用する。このようにして、本形態では、筒状回転体５の内周面に形成された雌ねじ７０と、出力部材７において筒状回転体５の内側に挿入された部分の外周面に形成された雄ねじ５０と、軸受部材６の穴６５によって、モータ３の回転出力を、出力部材７を直動させる力に変換する変換機構１０が構成されている。 (Configuration of conversion mechanism)
In the linear drive device 1 configured as described above, the rotation of the motor 3 around the horizontal axis L 5 is transmitted via the drive-side inclined gear 310 fixed to the motor shaft 31 and the driven-side inclined gear 410 of the transmission wheel 41. The rotation of the transmission wheel 4 around the vertical axis L 2 is transmitted to the cylindrical rotating body 5 via the external gear 420 and the external gear 520 of the cylindrical rotating body 5. Here, a female screw 70 is formed on the inner peripheral surface of the cylindrical rotating body 5, while a male screw 50 is formed on the outer peripheral surface on the lower end side of the motor shaft 31. Yes. Further, the hole 65 formed in the bearing member 6 (an obstruction prevention portion) is in the shape of an oblong long hole 65, and the substantially entire upper half including the portion penetrating the hole 65 in the output member 7 has a cross section. Is an oval oval shape. For this reason, although the output member 7 can move in the direction of the axis L1, rotation around the axis L1 is prevented. Therefore, when the cylindrical rotating body 5 rotates around the axis L1, the rotation acts as a force that linearly moves the output member 7 in the direction of the axis L1 when transmitted from the female screw 70 to the male screw 50. In this way, in this embodiment, the female screw 70 formed on the inner peripheral surface of the cylindrical rotating body 5 and the male screw formed on the outer peripheral surface of the portion inserted into the cylindrical rotating body 5 in the output member 7. 50 and the hole 65 of the bearing member 6 constitute a conversion mechanism 10 that converts the rotational output of the motor 3 into a force that linearly moves the output member 7.

（駆動系に関する主な効果）
このように本形態のリニア駆動装置１において、筒状回転体５では、この筒状回転体５の軸線方向の中央位置から上端側（一方側）に偏った位置に大径部分５２が形成され、かかる大径部分５２の外周面に外歯歯車５２０（歯車部）が形成されている。このため、伝達車４から筒状回転体５への減速比を大きく設定することができる。 (Main effects on the drive system)
As described above, in the linear drive device 1 of the present embodiment, the cylindrical rotating body 5 has the large-diameter portion 52 formed at a position deviated from the center position in the axial direction of the cylindrical rotating body 5 toward the upper end side (one side). An external gear 520 (gear portion) is formed on the outer peripheral surface of the large-diameter portion 52. For this reason, the reduction ratio from the transmission wheel 4 to the cylindrical rotating body 5 can be set large.

また、筒状回転体５の上端側に大径部分５２を形成した分、筒状回転体５の大径部分５２の軸線Ｌ１方向の下端側（他方側）に空きスペースがあるので、本形態では、かかる空きスペースを利用してモータ３が配置されている。このため、軸線Ｌ１、Ｌ２方向からみたとき、筒状回転体５の外歯歯車５２０に対して一部が重なるようにモータ３が配置された状態にある。それ故、筒状回転体５の周囲の近傍にモータ３を配置した分、リニア駆動装置１の小型化を図ることができる。 Further, since the large-diameter portion 52 is formed on the upper end side of the cylindrical rotating body 5, there is an empty space on the lower end side (the other side) in the axis L1 direction of the large-diameter portion 52 of the cylindrical rotating body 5. Then, the motor 3 is arrange | positioned using this empty space. For this reason, when viewed from the directions of the axes L1 and L2, the motor 3 is disposed so as to partially overlap the external gear 520 of the cylindrical rotating body 5. Therefore, the linear drive device 1 can be downsized as much as the motor 3 is arranged in the vicinity of the periphery of the cylindrical rotating body 5.

さらに、筒状回転体５に大径部分５２を形成したので、大径部分５２の内側で軸受部材６が出力部材７と干渉することなく筒状回転体５をラジアル方向で支持した構造を採用でき、それ故、狭いスペースで筒状回転体５を確実に支持することができる。 Further, since the large-diameter portion 52 is formed in the cylindrical rotating body 5, the structure in which the cylindrical rotating body 5 is supported in the radial direction without interfering with the output member 7 inside the large-diameter portion 52 is adopted. Therefore, the cylindrical rotating body 5 can be reliably supported in a narrow space.

（位置検出機構８の構成）
図３は、本発明を適用したリニア駆動装置１から上ケース２２を外してその内部に構成した位置検出機構８の構成を示す平面図である。 (Configuration of position detection mechanism 8)
FIG. 3 is a plan view showing a configuration of the position detection mechanism 8 configured by removing the upper case 22 from the linear drive device 1 to which the present invention is applied.

本形態のリニア駆動装置１では、図１、図２（ｂ）および図３を参照して以下に説明する位置検出機構８によって、出力部材７の上死点および下死点を検出する。かかる位置検出機構８を構成するにあたって、本形態で、図１、図２（ｂ）および図３に示すように、まず、モータ軸３１の外周面には、その上端寄り位置に下死点検出用凹部７１が形成されているとともに、下端寄り位置に上死点検出用凹部７２が形成されている。本形態において、下死点検出用凹部７１および上死点検出用凹部７２は、出力部材７の外周面のうち、出力部材７の中心軸線（軸線Ｌ１）に対して点対称位置に形成されている。 In the linear drive device 1 of this embodiment, the top dead center and the bottom dead center of the output member 7 are detected by the position detection mechanism 8 described below with reference to FIGS. 1, 2 (b) and 3. In constructing the position detection mechanism 8, in this embodiment, as shown in FIGS. 1, 2 (b), and 3, first, a bottom dead center is detected on the outer peripheral surface of the motor shaft 31 at a position near its upper end. A concave portion 71 is formed, and a top dead center detecting concave portion 72 is formed near the lower end. In this embodiment, the bottom dead center detecting recess 71 and the top dead center detecting recess 72 are formed at point-symmetrical positions with respect to the central axis (axis L1) of the output member 7 on the outer peripheral surface of the output member 7. Yes.

次に、軸受部材６と上ケース２２とによって挟まれた空間内には、軸受部材６の上面に重なるように剛性のセンサ基板８０が固定されており、かかるセンサ基板８０は、出力部材７の軸線Ｌ１方向に基板面８０ａが直交するような姿勢で配置されている。また、センサ基板８０の基板面８０ａには、所定の間隔を空けて対向するように下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２が搭載されている。 Next, a rigid sensor substrate 80 is fixed in the space between the bearing member 6 and the upper case 22 so as to overlap the upper surface of the bearing member 6, and the sensor substrate 80 is connected to the output member 7. The substrate surface 80a is disposed so as to be orthogonal to the direction of the axis L1. Further, a bottom dead center detecting proximity switch 81 and a top dead center detecting proximity switch 82 are mounted on the substrate surface 80a of the sensor substrate 80 so as to face each other with a predetermined interval.

また、軸受部材６の上面には、下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２の各々に対して出力部材７が配置されている側に２つの支点用小突起６６、６７が形成されており、かかる２つの支点用小突起６６、６７の各々には、支点用小突起６６、６７を中心に回転可能なように下死点検出用レバー８６および上死点検出用レバー８７（位置検出用可動部材）が支持されている。すなわち、下死点検出用レバー８６および上死点検出用レバー８７の各々には、その長さ方向の略中央位置に小さな円筒部が形成されており、かかる円筒部８６ｅ、８７ｅに支点用小突起６６、６７が嵌っている。 Further, on the upper surface of the bearing member 6, two fulcrum small protrusions 66 on the side where the output member 7 is disposed with respect to each of the bottom dead center detecting proximity switch 81 and the top dead center detecting proximity switch 82, 67. Each of the two fulcrum small projections 66, 67 is provided with a bottom dead center detection lever 86 and a top dead center detection lever so as to be rotatable around the fulcrum small projections 66, 67. A lever 87 (position detecting movable member) is supported. That is, each of the bottom dead center detection lever 86 and the top dead center detection lever 87 is formed with a small cylindrical portion at a substantially central position in the length direction, and the cylindrical portions 86e and 87e have small fulcrum points. The protrusions 66 and 67 are fitted.

下死点検出用レバー８６および上死点検出用レバー８７は、先端側が下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２の各作動面に対向する位置まで延びている一方、下死点検出用レバー８６および上死点検出用レバー８７の基端側８６ｂ、８７ｂに形成されたばね受け部分には共通の引っ張りコイルばね８９（共通の付勢部材／付勢手段）が掛けられている。このため、下死点検出用レバー８６および上死点検出用レバー８７には、引っ張りコイルばね８９によって、先端側同士が離間して下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２に当接する方向に付勢されている。但し、下死点検出用レバー８６および上死点検出用レバー８７には、引っ張りコイルばね８９の接続位置と、円筒部８６ｅ、８７ｅとの間で出力部材７の外周面に向けて突出した突起８６ｃ、８７ｃが形成されており、かかる突起８６ｃ、８７ｃは、出力部材７の外周面に当接して下死点検出用レバー８６および上死点検出用レバー８７の先端側がこれ以上、下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２に向けて変位するのを阻止している。 The bottom dead center detection lever 86 and the top dead center detection lever 87 extend to positions where the front end faces the operating surfaces of the bottom dead center detection proximity switch 81 and the top dead center detection proximity switch 82, respectively. A common tension coil spring 89 (common biasing member / biasing means) is applied to the spring receiving portions formed on the base end sides 86b and 87b of the bottom dead center detection lever 86 and the top dead center detection lever 87. ing. For this reason, the bottom dead center detection lever 86 and the top dead center detection lever 87 are separated from each other by a tension coil spring 89 so that the bottom dead center detection proximity switch 81 and the top dead center detection proximity switch. It is urged in the direction of abutting 82. However, the bottom dead center detection lever 86 and the top dead center detection lever 87 are protrusions protruding toward the outer peripheral surface of the output member 7 between the connection position of the tension coil spring 89 and the cylindrical portions 86e and 87e. 86c, 87c are formed, and the protrusions 86c, 87c are in contact with the outer peripheral surface of the output member 7 so that the tip side of the bottom dead center detection lever 86 and the top dead center detection lever 87 is more than the bottom dead center inspection. Displacement toward the outgoing proximity switch 81 and the top dead center detecting proximity switch 82 is prevented.

ここで、２つの突起８６ｃ、８７ｃは、出力部材７の中心軸線（軸線Ｌ１）に対して点対称位置な位置で出力部材７の外周面に当接しており、かつ、かかる当接位置は、出力部材７の外周面に形成した下死点検出用凹部７１および上死点検出用凹部７２の移動軌跡上に位置する。また、２つの突起８６ｃ、８７ｃは、引っ張りコイルばね８９によって、出力部材７の中心軸線に向けて付勢されている。また、２つの突起８６ｃ、８７ｃは、先端部分が下死点検出用凹部７１および上死点検出用凹部７２よりもサイズが小さく、かつ、下死点検出用凹部７１および上死点検出用凹部７２は、出力部材７が軸線方向に移動した際、２つの突起８６ｃ、８７ｃの先端部分がスムーズに侵入および脱出するように軸線方向の端部がテーパ面で形成されている。 Here, the two protrusions 86c and 87c are in contact with the outer peripheral surface of the output member 7 at a point-symmetrical position with respect to the central axis (axis line L1) of the output member 7, and the contact position is It is located on the movement locus of the bottom dead center detecting recess 71 and the top dead center detecting recess 72 formed on the outer peripheral surface of the output member 7. The two protrusions 86 c and 87 c are urged toward the central axis of the output member 7 by a tension coil spring 89. The two protrusions 86c, 87c are smaller in size than the bottom dead center detecting concave portion 71 and the top dead center detecting concave portion 72, and the bottom dead center detecting concave portion 71 and the top dead center detecting concave portion. 72, the end in the axial direction is formed with a tapered surface so that the tip portions of the two protrusions 86c and 87c smoothly enter and exit when the output member 7 moves in the axial direction.

このように構成した位置検出機構８において、出力部材７が上方に駆動された際、その上死点に到達するまでの間、２つの突起８６ｃ、８７ｃはいずれも、出力部材７の外周面上で摺動する。 In the position detection mechanism 8 configured in this way, when the output member 7 is driven upward, the two protrusions 86c and 87c are both on the outer peripheral surface of the output member 7 until reaching the top dead center. Slide on.

そして、出力部材７が上死位置に到達すると、上死点検出用凹部７２に上死点検出用レバー８７の突起８７ｃが侵入し、上死点検出用レバー８７は、先端側がセンサ基板８０の基板面８０ａに沿うように支点用小突起６７周りに回転する。その結果、上死点検出用レバー８７の先端部は、上死点検出用近接スイッチ８２を押す。従って、上死点検出用近接スイッチ８２からの出力を監視すれば、出力部材７が上死位置に到達したことを検出することができるので、出力部材７のこれ以上の駆動を停止することができる。その間、下死点検出用レバー８６は変位しないので、下死点検出用レバー８６および上死点検出用レバー８７には、引っ張りコイルばね８９によって、付勢力が印加された状態のままである。 When the output member 7 reaches the top dead center position, the protrusion 87c of the top dead center detection lever 87 enters the top dead center detection recess 72, and the top dead center detection lever 87 has a tip end side of the sensor substrate 80. It rotates around the fulcrum small protrusion 67 along the substrate surface 80a. As a result, the top end portion of the top dead center detection lever 87 presses the top dead center detection proximity switch 82. Therefore, if the output from the top dead center detecting proximity switch 82 is monitored, it can be detected that the output member 7 has reached the top dead position, so that further driving of the output member 7 can be stopped. it can. Meanwhile, since the bottom dead center detecting lever 86 is not displaced, the bottom dead center detecting lever 86 and the top dead center detecting lever 87 remain applied with a biasing force by the tension coil spring 89.

これに対して、出力部材７が下死位置に到達すると、下死点検出用凹部７１に下死点検出用レバー８６の突起８６ａが侵入し、下死点検出用レバー８６は、先端側がセンサ基板８０の基板面８０ａに沿うように支点用小突起６６周りに回転する。その結果、下死点検出用レバー８６の先端部は、下死点検出用近接スイッチ８１を押す。従って、下死点検出用近接スイッチ８１からの出力を監視すれば、出力部材７が下死位置に到達したことを検出することができるので、出力部材７のこれ以上の駆動を停止することができる。その間、上死点検出用レバー８７は変位しないので、下死点検出用レバー８６および上死点検出用レバー８７には、引っ張りコイルばね８９によって、付勢力が印加された状態のままである。 On the other hand, when the output member 7 reaches the bottom dead position, the protrusion 86a of the bottom dead center detection lever 86 enters the bottom dead center detection recess 71, and the bottom dead center detection lever 86 has a sensor on the tip side. It rotates around the small fulcrum 66 for supporting points so as to follow the substrate surface 80a of the substrate 80. As a result, the tip of the bottom dead center detection lever 86 pushes the bottom dead center detection proximity switch 81. Therefore, if the output from the bottom dead center detection proximity switch 81 is monitored, it is possible to detect that the output member 7 has reached the bottom dead position, so that further driving of the output member 7 can be stopped. it can. Meanwhile, since the top dead center detecting lever 87 is not displaced, the bottom dead center detecting lever 86 and the top dead center detecting lever 87 remain in a state in which an urging force is applied by the tension coil spring 89.

（位置検出機構８に関する主な効果）
このように本形態のリニア駆動装置１では、機構部品を用いて出力部材７の位置検出を行なうにあたって、出力部材７の外周面には軸線Ｌ１方向の所定位置に上死点検出用凹部７２および下死点検出用凹部７１（凹部）を形成するとともに、かかる凹部により下死点検出用レバー８６および上死点検出用レバー８７（位置検出用可動部材）を変位させ、かかるレバーの変位を下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２（スイッチ）で検出する。 (Main effects related to the position detection mechanism 8)
As described above, in the linear drive device 1 of the present embodiment, when detecting the position of the output member 7 using the mechanical components, the top dead center detecting recess 72 and the outer peripheral surface of the output member 7 are arranged at predetermined positions in the direction of the axis L1. A bottom dead center detection recess 71 (recess) is formed, and the bottom dead center detection lever 86 and the top dead center detection lever 87 (position detection movable member) are displaced by the recess to reduce the displacement of the lever. Detection is performed by a dead point detection proximity switch 81 and a top dead center detection proximity switch 82 (switch).

ここで、下死点検出用レバー８６および上死点検出用レバー８７に対しては出力部材７の外周面に常に当接するように付勢する必要があり、かかる付勢を行なうにあたって、本形態では、共通の引っ張りコイルばね８９（付勢部材）を用いているため、部品点数の削減を図ることができる。 Here, it is necessary to urge the bottom dead center detection lever 86 and the top dead center detection lever 87 so as to always come into contact with the outer peripheral surface of the output member 7. Then, since the common tension coil spring 89 (biasing member) is used, the number of parts can be reduced.

また、位置検出用可動部材として下死点検出用レバー８６および上死点検出用レバー８７を用いたため、位置検出用可動部材が直動する場合に比較して、位置検出用可動部材を変位可能に配置するのに必要なスペースが狭く済むので、リニア駆動装置１の小型化を図ることができる。しかも、位置検出用可動部材として下死点検出用レバー８６および上死点検出用レバー８７を用いれば、共通の引っ張りコイルばね８９によって、下死点検出用レバー８６および上死点検出用レバー８７を付勢する構造を容易に実現することができる。 Further, since the bottom dead center detecting lever 86 and the top dead center detecting lever 87 are used as the position detecting movable member, the position detecting movable member can be displaced as compared with the case where the position detecting movable member moves linearly. Since the space required for arranging the linear driving device is reduced, the linear drive device 1 can be downsized. Moreover, if the bottom dead center detecting lever 86 and the top dead center detecting lever 87 are used as the position detecting movable member, the bottom dead center detecting lever 86 and the top dead center detecting lever 87 are provided by the common tension coil spring 89. It is possible to easily realize a structure for energizing.

また、本形態では、下死点検出用レバー８６および上死点検出用レバー８７（複数の位置検出用可動部材）については同一の平面上で変位するように構成してあるため、下死点検出用レバー８６および上死点検出用レバー８７に所定の変位を行なわせるためのガイドや支持をセンサ基板８０によって行うことができる。従って、位置検出機構８の構成を簡素化することができるので、部品点数の削減を図ることができる。 In this embodiment, the bottom dead center detection lever 86 and the top dead center detection lever 87 (a plurality of position detection movable members) are configured to be displaced on the same plane. The sensor substrate 80 can be used to guide and support the output lever 86 and the top dead center detection lever 87 to perform predetermined displacement. Therefore, the configuration of the position detection mechanism 8 can be simplified, and the number of parts can be reduced.

さらに、下死点検出用レバー８６および上死点検出用レバー８７に対するガイドや支持を、下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２（スイッチ）が搭載されたセンサ基板によって行なうため、位置検出機構８の構成を簡素化することができる。しかも、下死点検出用レバー８６および上死点検出用レバー８７に対するガイドや支持を、下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２（スイッチ）が搭載されたセンサ基板によって行なうため、上死点検出用レバー８７の変位および下死点検出用レバー８６の変位に対して高い精度で対応する位置に下死点検出用近接スイッチ８１および上死点検出用近接スイッチ８２を配置することができる。このため、例えば、上死点検出用凹部７２および下死点検出用凹部７１を浅い凹部で形成することができるので、下死点検出用レバー８６および上死点検出用レバー８７の突起が上死点検出用凹部７２および下死点検出用凹部７１に対してスムーズに出入りすることができるなどの利点もある。 Further, the guide and support for the bottom dead center detecting lever 86 and the top dead center detecting lever 87 are provided by a sensor board on which a bottom dead center detecting proximity switch 81 and a top dead center detecting proximity switch 82 (switch) are mounted. Therefore, the configuration of the position detection mechanism 8 can be simplified. In addition, guides and support for the bottom dead center detection lever 86 and the top dead center detection lever 87 are provided by a sensor board on which a bottom dead center detection proximity switch 81 and a top dead center detection proximity switch 82 (switch) are mounted. Therefore, the bottom dead center detecting proximity switch 81 and the top dead center detecting proximity switch 82 are placed at positions corresponding to the displacement of the top dead center detecting lever 87 and the bottom dead center detecting lever 86 with high accuracy. Can be arranged. For this reason, for example, the top dead center detection recess 72 and the bottom dead center detection recess 71 can be formed as shallow recesses, so that the protrusions of the bottom dead center detection lever 86 and the top dead center detection lever 87 are on the upper side. There is also an advantage that the dead center detecting recess 72 and the bottom dead center detecting recess 71 can smoothly enter and exit.

また、下死点検出用レバー８６および上死点検出用レバー８７は、各々の突起８６ｃ、８７ｃが出力部材７の中心軸線に向けて付勢され、かつ、出力部材７の外周面のうち、出力部材７の中心軸線に対して点対称位置に当接している。このため、出力部材７の中心軸線を挟む両側に下死点検出用レバー８６および上死点検出用レバー８７を対称に配置すればよいので、共通の引っ張りコイルばね８９を用いて下死点検出用レバー８６および上死点検出用レバー８７を付勢する場合でも、容易に同等の付勢力を容易に印加することができる。また、共通の引っ張りコイルばね８９を用いれば、下死点検出用レバー８６および上死点検出用レバー８７に同等の付勢力を印加することができる。それ故、出力部材７に偏った力が加わらないので、出力部材７の移動がスムーズである。 Further, the bottom dead center detection lever 86 and the top dead center detection lever 87 are such that the projections 86c and 87c are urged toward the central axis of the output member 7, and of the outer peripheral surface of the output member 7, The output member 7 is in contact with the central axis of the output member 7 at a point symmetrical position. For this reason, the bottom dead center detection lever 86 and the top dead center detection lever 87 may be arranged symmetrically on both sides of the center axis of the output member 7, so that the bottom dead center detection is performed using the common tension coil spring 89. Even when the lever 86 and the top dead center detecting lever 87 are urged, the same urging force can be easily applied. Further, if the common tension coil spring 89 is used, an equivalent biasing force can be applied to the bottom dead center detection lever 86 and the top dead center detection lever 87. Therefore, since the biased force is not applied to the output member 7, the movement of the output member 7 is smooth.

（その他の実施の形態）
上記形態では、位置検出用可動部材として、支点を中心に回転する下死点検出用レバー８６および上死点検出用レバー８７を用いたが、直動する位置検出用可動部材を用いてもよい。 (Other embodiments)
In the above embodiment, the bottom dead center detection lever 86 and the top dead center detection lever 87 that rotate about the fulcrum are used as the position detection movable member. However, a linearly movable position detection movable member may be used. .

また、上記形態では、上死点および下死点のみを検出することを目的に２つの位置検出用可動部材（下死点検出用レバー８６および上死点検出用レバー８７）を用いたが、さらに多くの位置検出用可動部材を用いれば、上死点と下死点との間の位置についても検出することができる。 In the above embodiment, two position detection movable members (the bottom dead center detection lever 86 and the top dead center detection lever 87) are used for the purpose of detecting only the top dead center and the bottom dead center. If more position detecting movable members are used, the position between the top dead center and the bottom dead center can also be detected.

さらに、上記形態では、下死点検出用レバー８６および上死点検出用レバー８７を引っ張りコイルばね８９で付勢する構成を採用したが、下死点検出用レバー８６および上死点検出用レバー８７を支点より先端側に配置した圧縮コイルばねで付勢する構成を採用してもよい。 Further, in the above embodiment, the bottom dead center detecting lever 86 and the top dead center detecting lever 87 are urged by the tension coil spring 89. However, the bottom dead center detecting lever 86 and the top dead center detecting lever are employed. You may employ | adopt the structure urged | biased by the compression coil spring which has arrange | positioned 87 to the front end side from the fulcrum.

本発明を適用したリニア駆動装置から上ケースを外してその内部構造を示す斜視図である。It is a perspective view which removes an upper case from the linear drive device to which this invention is applied, and shows the internal structure. （ａ）、（ｂ）は、本発明を適用したリニア駆動装置の主要部を抜き出して、斜め下方からみた斜視図、および当該リニア駆動装置の縦断面図である。(A), (b) is the perspective view which extracted the principal part of the linear drive device to which this invention was applied, and was seen from diagonally downward, and the longitudinal cross-sectional view of the said linear drive device. 本発明を適用したリニア駆動装置から上ケースを外してその内部に構成した位置検出機構の構成を示す平面図である。It is a top view which shows the structure of the position detection mechanism comprised by removing the upper case from the linear drive device to which this invention is applied.

Explanation of symbols

１リニア駆動装置
３モータ
４伝達車
５筒状回転部材
６軸受部材
７出力部材
８位置検出機構
１０変換機構
５２筒状回転部材の大径部分
６５穴（伴周り阻止部）
７１下死点検出用凹部（凹凸）
７２上死点検出用凹部（凹凸）
８１下死点検出用近接スイッチ
８２上死点検出用近接スイッチ
８６下死点検出用レバー（位置検出用可動部材）
８７上死点検出用レバー（位置検出用可動部材）
８９引っ張りコイルばね（付勢部材／付勢手段）
５２０筒状回転部材の外歯歯車（歯車部） DESCRIPTION OF SYMBOLS 1 Linear drive device 3 Motor 4 Transmission wheel 5 Cylindrical rotating member 6 Bearing member 7 Output member 8 Position detection mechanism 10 Conversion mechanism 52 Large-diameter part 65 hole of cylindrical rotating member (companion prevention part)
71 Bottom dead center detection recess (unevenness)
72 Top dead center detection recess
81 proximity switch for detecting bottom dead center 82 proximity switch for detecting top dead center 86 lever for detecting bottom dead center (movable member for position detection)
87 Top dead center detection lever (movable member for position detection)
89 Tension coil spring (biasing member / biasing means)
520 External gear (gear part) of cylindrical rotating member

Claims

In a linear drive device having a motor, an output member, and a conversion mechanism that converts a rotational output of the motor into a force that linearly moves the output member,
A position detection mechanism for detecting a position of the output member in the axial direction;
The position detection mechanism includes a plurality of position detection movable members that are in contact with the outer peripheral surface of the output member and displaced by unevenness formed at predetermined positions in the axial direction of the outer peripheral surface of the output member, and the plurality of position detections A switch for detecting the displacement of each of the movable members for use, and a biasing means for biasing the plurality of movable members for position detection so as to contact the output member,
The linear driving device according to claim 1, wherein the biasing means is a common biasing member that applies a biasing force to each of the plurality of position detecting movable members.

In a linear drive device having a motor, an output member, and a conversion mechanism that converts a rotational output of the motor into a force that linearly moves the output member,
A position detection mechanism for detecting a position of the output member in the axial direction;
The position detection mechanism includes a plurality of position detection movable members that are in contact with the outer peripheral surface of the output member and displaced by unevenness formed at predetermined positions in the axial direction of the outer peripheral surface of the output member, and the plurality of position detections A switch for detecting the displacement of each of the movable members for use, and a biasing means for biasing the plurality of movable members for position detection so as to contact the output member,
The linear drive device characterized in that the plurality of position detecting movable members are displaced on the same plane.

The switch is mounted on a rigid substrate,
The linear drive device according to claim 2, wherein the plurality of position detection movable members are displaced along the substrate surface of the rigid substrate.

4. The linear drive device according to claim 2, wherein the biasing unit is a common biasing member that applies a biasing force to each of the plurality of position detection movable members. 5.

4. The linear drive device according to claim 1, wherein each of the plurality of position detection movable members is a lever that is rotatable around a fulcrum. 5.

The plurality of position detecting movable members are arranged so as to be displaceable within a plane orthogonal to the axis of the output member,
The two position detecting movable members are biased toward the central axis of the output member by the biasing means, and are point-symmetric with respect to the central axis of the output member on the outer peripheral surface of the output member. The linear drive device according to claim 1, wherein the linear drive device is in contact with the position.