JP2009204346A - Position sensor - Google Patents

Position sensor Download PDF

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Publication number
JP2009204346A
JP2009204346A JP2008044855A JP2008044855A JP2009204346A JP 2009204346 A JP2009204346 A JP 2009204346A JP 2008044855 A JP2008044855 A JP 2008044855A JP 2008044855 A JP2008044855 A JP 2008044855A JP 2009204346 A JP2009204346 A JP 2009204346A
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detection
detected
coil
detected portion
position sensor
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Kohei Sato
晃平 佐藤
Tokuhiro Ida
徳浩 位田
Ryoji Ito
良治 伊藤
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a position sensor improved in detection accuracy. <P>SOLUTION: The position sensor is provided with: a detection part 2 mounted to a vehicle body and having a detection coil; a part to be detected 3 mounted to an axle and movable in a prescribed direction with respect to the detection coil; a circuit block 21 for processing the detection of displacements of the part 3 with respect to the detection part 2; and a casing 1 for housing the detection part 2, the part 3 and the circuit block 21. The part to be detected 3 is formed in tubular shape having openings at both ends in the direction of movement, and the detection part 2 is arranged in such a way as to be inserted in the part 3 from one end in the direction of movement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、検出コイルのインピーダンス変化を利用したポジションセンサに関する。   The present invention relates to a position sensor using a change in impedance of a detection coil.

従来から、車両の走行安定性などを高める若しくは維持するため、或いは荷揚げ、荷下ろし、乗降の際の利便性を向上する等の目的のために、走行速度や路面の凹凸状況等に応じて車両を所望の車高に制御する車高制御装置が知られている。このような車高制御装置では、所望の車高に制御するために車体と車軸との間の距離を検出する回動式のポジションセンサが用いられており、例えば特許文献１に開示されている。以下、この種のポジションセンサの従来例について図面を用いて説明する。   Conventionally, in order to improve or maintain the running stability of a vehicle, or to improve the convenience of unloading, unloading, and getting on and off, the vehicle according to the running speed and the unevenness of the road surface, etc. A vehicle height control device that controls the vehicle height to a desired vehicle height is known. In such a vehicle height control device, a rotary position sensor that detects the distance between the vehicle body and the axle is used in order to control the vehicle height to a desired vehicle height, which is disclosed in Patent Document 1, for example. . Hereinafter, a conventional example of this type of position sensor will be described with reference to the drawings.

この従来例は、図４に示すように、車体（図示せず）に取付固定される車体側ブラケット１０２に取り付けられた検出部１００と、検出部１００と車軸（図示せず）に取付固定される車軸側ブラケット１０３とを互いに連結する連結部材１０１とから成る。検出部１００には、角度位置又は角度位置変化の入力部である回動部（図示せず）が設けられ、その回動平面において径方向に延伸する棒状の車体側連結部材１０１ａの一端部が取り付けられている。車体側連結部材１０１ａの他端部には、その回動平面において径方向に延伸する棒状の車軸側連結部材１０１ｂの一端部が回動自在に取り付けられており、車軸側連結部材１０１ｂの他端部が車軸側ブラケット１０３に回動自在に取り付けられている。このため、車体と車軸との間の距離、即ち車高に応じて、車体側連結部材１０１ａ及び車軸側連結部材１０１ｂを介して検出部１００の回動部が回動する。回動部の角度位置の変化は、検出部１００に内蔵されるホールＩＣ又は磁気抵抗素子（ＭＲ素子）等から成る回路（図示せず）を介して電気信号に変換され、ＣＰＵ、ＲＯＭ、各種インタフェース、Ａ／Ｄ変換器等から構成される制御ユニット（図示せず）に出力される。制御ユニットでは、該電気信号を受けて車高を演算する。
特開２００７−３０７９８９号公報 In this conventional example, as shown in FIG. 4, the detection unit 100 attached to the vehicle body side bracket 102 attached and fixed to the vehicle body (not shown), and the detection unit 100 and the axle (not shown) are attached and fixed. And a connecting member 101 for connecting the axle side brackets 103 to each other. The detection unit 100 is provided with a rotation unit (not shown) that is an input unit for an angular position or angular position change, and one end portion of a rod-shaped vehicle body side connecting member 101a that extends in the radial direction on the rotation plane is provided. It is attached. One end of a rod-like axle-side connecting member 101b extending in the radial direction on the rotation plane is rotatably attached to the other end of the vehicle-body-side connecting member 101a, and the other end of the axle-side connecting member 101b. The part is rotatably attached to the axle side bracket 103. For this reason, the rotation part of the detection part 100 rotates via the vehicle body side connection member 101a and the axle side connection member 101b according to the distance between the vehicle body and the axle, that is, the vehicle height. The change in the angular position of the rotation unit is converted into an electrical signal via a circuit (not shown) including a Hall IC or a magnetoresistive element (MR element) built in the detection unit 100, and is used for CPU, ROM, The data is output to a control unit (not shown) including an interface, an A / D converter, and the like. The control unit receives the electrical signal and calculates the vehicle height.
JP 2007-307989 A

しかしながら、上記従来例では、車体に対する車軸の変位を直接検出するのではなく、前記変位を回動部の角度位置の変化に変換して検出しているので、連結部材等の車体と車軸との間に介在する部品毎に生じる変位の誤差が累積することで検出精度が劣化する虞があった。   However, in the above conventional example, the displacement of the axle relative to the vehicle body is not directly detected, but is detected by converting the displacement into a change in the angular position of the rotating portion. There is a possibility that the detection accuracy is deteriorated by accumulating displacement errors generated for each part interposed therebetween.

本発明は、上記の点に鑑みて為されたもので、検出精度を向上することのできるポジションセンサを提供することを目的とする。   The present invention has been made in view of the above points, and an object thereof is to provide a position sensor capable of improving detection accuracy.

請求項１の発明は、上記目的を達成するために、車体又は車軸の何れか一方の側に取り付けられて検出コイルを有する検出部と、前記他方の側に取り付けられて検出コイルに対して所定の方向に移動可能な被検出部と、検出コイルに所定の周波数及び振幅の電流を供給する駆動回路部、並びに駆動回路部が出力した電流及び検出コイルのインピーダンスにより決まる電圧信号を検出部に対する被検出部の位置情報を示す出力信号に変換する信号処理回路部を有する回路ブロックと、検出部及び被検出部及び回路ブロックを収納する筐体とを備え、検出部に対する被検出部の変位を検出するポジションセンサであって、被検出部は、前記移動方向における両端が開口した筒状に形成され、検出部は、前記移動方向における一端から被検出部の内側に入り込む形に配置されたことを特徴とする。   In order to achieve the above object, the invention according to claim 1 has a detection unit attached to one of the vehicle body and the axle and having a detection coil, and a detection unit attached to the other side of the detection coil. And a drive circuit unit that supplies a current of a predetermined frequency and amplitude to the detection coil, and a voltage signal determined by the current output from the drive circuit unit and the impedance of the detection coil. A circuit block having a signal processing circuit unit that converts an output signal indicating position information of the detection unit, and a housing that houses the detection unit, the detection unit, and the circuit block, and detects displacement of the detection unit relative to the detection unit The detected part is formed in a cylindrical shape having both ends opened in the moving direction, and the detecting part is located inside the detected part from one end in the moving direction. Characterized in that arranged in the form entering the.

請求項２の発明は、請求項１の発明において、検出部は、検出コイルが巻回されるコイルボビンを有し、筐体には、コイルボビンが挿入され且つ検出部及び回路ブロックを収納する空間と被検出部を収納する空間とを隔てる有底筒状の内筒部が一体に形成されるとともに、コイルボビンに貫設された取付孔に挿入されてコイルボビンをかしめ固定するための突起が設けられたことを特徴とする。   According to a second aspect of the present invention, in the first aspect of the present invention, the detection unit includes a coil bobbin around which the detection coil is wound, and the housing includes a space in which the coil bobbin is inserted and the detection unit and the circuit block are accommodated. A bottomed cylindrical inner cylinder part that separates the space for storing the detected part is integrally formed, and a protrusion for caulking and fixing the coil bobbin by being inserted into a mounting hole penetrating the coil bobbin is provided. It is characterized by that.

請求項３の発明は、請求項１又は２の発明において、被検出部には、被検出部を前記移動方向に摺動自在に支持する軸受が設けられ、筐体には、軸受を保持するとともに被検出部と軸受との隙間を覆う保持部材が設けられたことを特徴とする。   According to a third aspect of the present invention, in the first or second aspect of the invention, the detected portion is provided with a bearing that slidably supports the detected portion in the moving direction, and the housing holds the bearing. And the holding member which covers the clearance gap between a to-be-detected part and a bearing is provided.

請求項４の発明は、請求項１乃至３の何れか１項の発明において、被検出部の前記移動方向における一端には、該一端の開口を塞ぐキャップが設けられ、該キャップに前記移動方向に貫通する通孔を設けたことを特徴とする。   The invention of claim 4 is the invention of any one of claims 1 to 3, wherein a cap for closing the opening of the one end is provided at one end in the moving direction of the detected part, and the cap has the moving direction. A through-hole penetrating through is provided.

請求項１の発明によれば、検出部に対する被検出部の変位を検出コイルのインピーダンス変化を利用して検出することで車体と車軸との間の距離を測定することができるので、従来例のように車体と車軸との間に介在する連結部材等の部品を必要とせず変位を直接検出でき、したがって部品毎の誤差が生じることがなく検出精度を向上することができる。また、連結部材等の部品を配設するためのスペースが必要とならないため、省スペース化を図ることができる。   According to the first aspect of the present invention, the distance between the vehicle body and the axle can be measured by detecting the displacement of the detected portion with respect to the detecting portion using the impedance change of the detection coil. Thus, it is possible to directly detect the displacement without requiring a component such as a connecting member interposed between the vehicle body and the axle, and therefore it is possible to improve the detection accuracy without causing an error for each component. In addition, a space for arranging components such as a connecting member is not required, and thus space saving can be achieved.

請求項２の発明によれば、被検出部を収納する空間に水が浸入したとしても内筒部によって検出部を収納する空間に水が浸入するのを防ぐことができる。また、コイルボビンに貫設された取付孔に突起を挿入することでコイルボビンを内筒部に挿入する形で取り付けるので、振動等によってコイルボビンが揺れるのを防ぐことができる。   According to the second aspect of the present invention, even if water enters the space for storing the detected portion, it is possible to prevent water from entering the space for storing the detecting portion by the inner cylinder portion. In addition, since the coil bobbin is attached by inserting the protrusion into the attachment hole penetrating the coil bobbin, the coil bobbin can be prevented from shaking due to vibration or the like.

請求項３の発明によれば、軸受が被検出部から抜け落ちるのを防ぐとともに、軸受と被検出部との隙間から水や塵埃等の異物が侵入するのを防ぐことができる。   According to the third aspect of the present invention, it is possible to prevent the bearing from falling off the detected portion and to prevent foreign matters such as water and dust from entering through the gap between the bearing and the detected portion.

請求項４の発明によれば、被検出部の移動方向と重力方向とを一致させるようにポジションセンサを配置した場合に、仮に被検出部内に水が浸入したとしても、浸入した水が重力方向に移動して通孔を介して外部に排出されるため、効率よく排水することができる。   According to the fourth aspect of the present invention, when the position sensor is arranged so that the direction of movement of the detected portion and the direction of gravity coincide with each other, even if water enters the detected portion, the intruded water remains in the direction of gravity. Since it is discharged to the outside through the through hole, it can be drained efficiently.

以下、本発明に係るポジションセンサの実施形態について図面を用いて説明する。但し、以下の説明では、図１（ａ）における下方向を前方向、図１（ａ）における上方向を後方向と定めるものとする。本実施形態は、図１（ａ），（ｂ）に示すように、車体（図示せず）に取り付けられて検出コイル（図示せず）を有する検出部２と、車軸（図示せず）に取り付けられて前後方向に移動自在な被検出部３と、回路ブロック２１と、検出部２及び回路ブロック２１及び被検出部３を収納する筐体１とから構成される。   Embodiments of a position sensor according to the present invention will be described below with reference to the drawings. However, in the following description, the downward direction in FIG. 1A is defined as the forward direction, and the upward direction in FIG. 1A is defined as the backward direction. In this embodiment, as shown in FIGS. 1A and 1B, a detector 2 attached to a vehicle body (not shown) and having a detection coil (not shown) and an axle (not shown) are provided. The detection target unit 3 is attached and movable in the front-rear direction, the circuit block 21, and the detection unit 2, the circuit block 21, and the casing 1 that houses the detection unit 3.

筐体１は、図１（ａ），（ｂ）に示すように、後面を開口した略箱体の基台部１０と、基台部１０前面から前方に突設された長尺の略円筒状の外筒部１１と、基台部１０の側面に貫設されて後述する回路ブロック２１に接続された信号線（図示せず）や電源線（図示せず）等を外部に導出させる導出部１４とから成り、基台部１０の前記開口には、開口を塞ぐための略矩形状のカバー１２が着脱自在に取り付けられるようになっている。   As shown in FIGS. 1A and 1B, the housing 1 includes a substantially box-shaped base portion 10 having a rear surface opened, and a long, substantially cylindrical shape protruding forward from the front surface of the base portion 10. And a signal line (not shown), a power supply line (not shown), etc. that are led through the side surface of the base part 10 and connected to a circuit block 21 to be described later are led out to the outside. A substantially rectangular cover 12 for closing the opening is detachably attached to the opening of the base part 10.

検出部２は、検出コイルと、検出コイルが巻回されるコイルボビン２０とから構成され、検出コイルには、検出コイルのインピーダンス変化に基づいて検出処理を行う回路ブロック２１が棒状のコイル端子２２を介して電気的に接続されている。   The detection unit 2 includes a detection coil and a coil bobbin 20 around which the detection coil is wound. A circuit block 21 that performs detection processing based on a change in impedance of the detection coil includes a rod-shaped coil terminal 22. Is electrically connected.

コイルボビン２０は、例えば絶縁性を有する樹脂材料から成り、検出コイルが外周面に巻回される略円筒状の巻胴部２０ａと、巻胴部２０ａの後端部に設けられた鍔部２０ｂとを一体に備えている。鍔部２０ｂは、巻胴部２０ａよりも外径が大きい略円盤状に形成され、その中心軸は巻胴部２０ａの中心軸と一致している。検出コイルは、コイルボビン２０の巻胴部２０ａに前後方向を巻き軸方向として巻回されており、その両端部は基台部１０に貫装されたコイル端子２２の前端部に絡げられる。コイルボビン２０は、鍔部２０ｂを基台部１０の前面に接合することで、巻胴部２０ａを前方に突出させる形で外筒部１１内に配設される。   The coil bobbin 20 is made of, for example, an insulating resin material, and has a substantially cylindrical winding body 20a around which the detection coil is wound on the outer peripheral surface, and a flange 20b provided at the rear end of the winding body 20a. Is integrated. The flange portion 20b is formed in a substantially disk shape having an outer diameter larger than that of the winding drum portion 20a, and the central axis thereof coincides with the central axis of the winding drum portion 20a. The detection coil is wound around the winding body portion 20 a of the coil bobbin 20 with the front-rear direction as the winding axis direction, and both ends thereof are entangled with the front end portion of the coil terminal 22 penetrating the base portion 10. The coil bobbin 20 is disposed in the outer cylinder part 11 in such a manner that the winding body part 20a protrudes forward by joining the flange part 20b to the front surface of the base part 10.

コイルボビン２０の巻胴部２０ａには、例えば鉄やフェライト等の磁性材料により丸棒状に形成されたコア２３が挿入されている。このため、検出コイルの巻数が同じであれば空芯の検出コイルよりも磁束を大きくできるから、検出コイルのインピーダンスの変化量を大きくすることができ、検出精度の向上を図っている。   A core 23 formed in a round bar shape with a magnetic material such as iron or ferrite is inserted into the winding body 20a of the coil bobbin 20. For this reason, if the number of turns of the detection coil is the same, the magnetic flux can be made larger than that of the air-core detection coil. Therefore, the amount of change in the impedance of the detection coil can be increased, and the detection accuracy is improved.

回路ブロック２１は、プリント配線板２１ａに電子部品を実装して構成されたものであって、検出コイルに所定の周波数及び振幅の電流を出力する駆動回路部（図示せず）と、駆動回路部が出力した電流及び検出コイルのインピーダンスにより決まる電圧信号を検出部２に対する被検出部３の位置情報を示す出力信号に変換する信号処理回路部（図示せず）とを有している。   The circuit block 21 is configured by mounting electronic components on a printed wiring board 21a, and includes a drive circuit unit (not shown) that outputs a current having a predetermined frequency and amplitude to a detection coil, and a drive circuit unit. And a signal processing circuit unit (not shown) for converting a voltage signal determined by the current output from the sensor and the impedance of the detection coil into an output signal indicating position information of the detected portion 3 with respect to the detecting portion 2.

基台部１０の内底部には、図２（ａ）に示すように、回路ブロック２１のプリント配線板２１ａの周縁の一部（プリント配線板２１ａの長手方向両端部）が載置される第１の段部１０ｂと、コイルボビン２０の鍔部２０ｂが載置される第２の段部１０ｃとが形成されている。尚、第１の段部１０ｂの内径寸法は、コイルボビン２０の鍔部２０ｂの外径寸法よりも大きく且つ回路ブロック２１の長手方向の長さ寸法よりも小さく形成されており、第２の段部１０ｃの内径寸法はコイルボビン２０の鍔部２０ｂの外径寸法よりも小さく形成されている。   As shown in FIG. 2A, a part of the periphery of the printed wiring board 21a of the circuit block 21 (both ends in the longitudinal direction of the printed wiring board 21a) is placed on the inner bottom portion of the base 10. A first step portion 10b and a second step portion 10c on which the flange portion 20b of the coil bobbin 20 is placed are formed. The inner diameter dimension of the first step portion 10b is larger than the outer diameter size of the flange portion 20b of the coil bobbin 20 and smaller than the length dimension in the longitudinal direction of the circuit block 21, and the second step portion. The inner diameter dimension of 10c is formed smaller than the outer diameter dimension of the flange 20b of the coil bobbin 20.

基台部１０の前面には、前端部が閉塞された有底円筒状の内筒部１３が前方に突出する形で設けられている。内筒部１３は、その前後方向の長さ寸法がコイルボビン２０の巻胴部２０ａの前後方向の長さ寸法よりも僅かに大きく、且つその内径寸法がコイルボビン２０の巻胴部２０ａの外径寸法よりも僅かに大きく形成されている。また、内筒部１３は、その開口縁が基台部１０と一体に形成され、基台部１０の内部と連通している。而して、コイルボビン２０は、巻胴部２０ａを基台部１０の内部を通して後方から内筒部１３に挿入することで基台部１０及び内筒部１３内に配設される。   On the front surface of the base portion 10, a bottomed cylindrical inner tube portion 13 whose front end portion is closed is provided so as to protrude forward. The inner cylinder part 13 has a length dimension in the front-rear direction slightly larger than a length dimension in the front-rear direction of the winding body part 20 a of the coil bobbin 20 and an inner diameter dimension of the outer cylinder part 20 a of the coil bobbin 20. It is formed slightly larger than. Moreover, the opening edge of the inner cylinder part 13 is formed integrally with the base part 10 and communicates with the inside of the base part 10. Thus, the coil bobbin 20 is disposed in the base part 10 and the inner cylinder part 13 by inserting the winding body part 20 a into the inner cylinder part 13 from the rear through the inside of the base part 10.

ここで、内筒部１３の後端の開口縁が基台部１０と一体に形成されていることから、内筒部１３の内側、即ち検出部２及び回路ブロック２１が収納される側の空間と、内筒部１３の外側、即ち被検出部３が収納される側の空間とが内筒部１３によって物理的に隔てられる。而して、外筒部１１の前端部から内部に水が浸入したとしても検出部２側の空間に水が浸入することがなく、検出部２及び回路ブロック２１に防水性を与えることができる。   Here, since the opening edge of the rear end of the inner cylinder part 13 is integrally formed with the base part 10, it is the space inside the inner cylinder part 13, ie, the side in which the detection part 2 and the circuit block 21 are accommodated. And the outside of the inner cylinder part 13, that is, the space on the side where the detected part 3 is accommodated, is physically separated by the inner cylinder part 13. Thus, even if water enters from the front end portion of the outer cylinder portion 11, water does not enter the space on the detection portion 2 side, and the detection portion 2 and the circuit block 21 can be waterproofed. .

コイルボビン２０の鍔部２０ｂには、図１（ａ）に示すように、前後方向に貫通する略円形状の２つの取付孔２０ｃが設けられている。また、基台部１０の第２の段部１０ｃには、図２に示すように、該取付孔２０ｃと対応する位置に後方向に突出する一対の突起１０ｄが一体に設けられている。而して、突起１０ｄを取付孔２０ｃに挿入させた状態で突起１０ｄに熱を与えてかしめることで、コイルボビン２０の鍔部２０ｂを第２の段部１０ｃに接合して取付けることができる。ここで、コイルボビン２０の巻胴部２０ａを内筒部１３に挿入するとともに突起１０ｄを取付孔２０ｃに挿入することでコイルボビン２０を筐体１に取り付けるので、振動等によってコイルボビン２０が揺れるのを防ぐことができる。   As shown in FIG. 1A, the flange 20b of the coil bobbin 20 is provided with two substantially circular mounting holes 20c penetrating in the front-rear direction. Further, as shown in FIG. 2, a pair of protrusions 10 d protruding backward are integrally provided on the second step portion 10 c of the base portion 10 at positions corresponding to the mounting holes 20 c. Thus, by applying heat to the protrusion 10d while the protrusion 10d is inserted into the attachment hole 20c, the flange 20b of the coil bobbin 20 can be attached and attached to the second step part 10c. Here, since the coil bobbin 20 is attached to the housing 1 by inserting the winding body part 20a of the coil bobbin 20 into the inner cylinder part 13 and inserting the protrusion 10d into the attachment hole 20c, the coil bobbin 20 is prevented from shaking due to vibration or the like. be able to.

被検出部３は、例えばアルミニウム等の導電性が比較的高い金属材料から略円筒状に形成されている。勿論、アルミニウム以外の金属材料から形成されても構わないが、導電性が低いものよりも高いものの方が検出コイルのインピーダンス変化を大きくできるために好ましい。また、被検出部３は、その外径寸法が外筒部１１の内径寸法よりも小さく、且つ内径寸法がコイルボビン２０の巻胴部２０ａの外径寸法よりも大きく形成されており、外筒部１１とコイルボビン２０との間の空間に挿入されるようになっている。このため、コイルボビン２０は、前後方向における一端から被検出部３の内側に入り込む形に配置される。   The detected portion 3 is formed in a substantially cylindrical shape from a metal material having relatively high conductivity, such as aluminum. Of course, it may be formed of a metal material other than aluminum, but a material having a higher conductivity than a material having a low conductivity is preferable because the impedance change of the detection coil can be increased. The detected portion 3 has an outer diameter dimension smaller than the inner diameter dimension of the outer cylinder portion 11 and an inner diameter dimension larger than the outer diameter dimension of the winding body portion 20a of the coil bobbin 20, and the outer cylinder portion 11 and the coil bobbin 20 are inserted into the space. For this reason, the coil bobbin 20 is arrange | positioned in the form which penetrates into the to-be-detected part 3 from the end in the front-back direction.

被検出部３の前端部には、その開口を塞ぐためのキャップ３０が取り付けられている。キャップ３０の後面には、被検出部３の前端部が嵌合する嵌合溝３０ｃが周方向に沿って設けられており、該嵌合溝３０ｃに被検出部３の前端部を嵌合することでキャップ３０が被検出部３に取り付けられる。また、キャップ３０の略中央部には、前後方向に貫通した貫通孔３０ａが設けられており、該貫通孔３０ａにピストンロッド４の先端部を挿入し、該ピストンロッド４の前後方向の移動に伴って被検出部３を前後方向に移動させることで被検出部３の検出部２に対する位置を変化させる。この被検出部３の検出部２に対する位置によって検出コイルのインピーダンスが変化するため、検出部２に対する被検出部３の位置を回路ブロック２１において検出することができる。   A cap 30 for closing the opening is attached to the front end of the detected portion 3. On the rear surface of the cap 30, a fitting groove 30c into which the front end portion of the detected portion 3 is fitted is provided along the circumferential direction, and the front end portion of the detected portion 3 is fitted into the fitting groove 30c. Thus, the cap 30 is attached to the detected portion 3. Further, a through hole 30a penetrating in the front-rear direction is provided at a substantially central portion of the cap 30, and the tip end portion of the piston rod 4 is inserted into the through-hole 30a so that the piston rod 4 can be moved in the front-rear direction. Accordingly, the position of the detected part 3 relative to the detecting part 2 is changed by moving the detected part 3 in the front-rear direction. Since the impedance of the detection coil changes depending on the position of the detected portion 3 relative to the detecting portion 2, the position of the detected portion 3 relative to the detecting portion 2 can be detected in the circuit block 21.

また、キャップ３０には、外筒部１１内と外筒部１１外とを連通する略円形状の通孔３０ｂを複数（図示では４つ）貫設している。これは、被検出部３の前後方向の移動に伴って外筒部１１内部の空気が圧縮されて圧力が高くなることで被検出部３の後方向への移動が阻害されるのを防ぐためであり、通孔３０ｂを通して空気が移動することで被検出部３の後方向の移動を滑らかにしている。更に、本実施形態のようなポジションセンサは、通常移動方向と重力方向とを一致させる形で使用されることから、通孔３０ｂを介して外筒部１１内に水が浸入し難く、たとえ外筒部１１内に水が浸入した場合にも浸入した水が重力方向に移動するため、通孔３０ｂを介して外部に効率よく排水することができる。   Further, the cap 30 is provided with a plurality (four in the figure) of substantially circular through holes 30b that allow the inside of the outer cylinder portion 11 and the outside of the outer cylinder portion 11 to communicate with each other. This is to prevent the backward movement of the detected portion 3 from being hindered due to the pressure in the air inside the outer cylinder portion 11 being increased as the detected portion 3 moves in the front-rear direction. The movement of the detected portion 3 in the backward direction is smoothed by the movement of air through the through hole 30b. Furthermore, since the position sensor as in the present embodiment is used in the form in which the normal movement direction and the gravitational direction are matched, it is difficult for water to enter the outer cylinder portion 11 through the through hole 30b. Even when water intrudes into the cylinder portion 11, the infiltrated water moves in the direction of gravity, so that it can be efficiently drained to the outside through the through hole 30b.

被検出部３には、被検出部３を前後方向に摺動自在に支持する略円環状の軸受３１が設けられている。軸受３１は、その内径寸法が被検出部３の外径寸法と略同一となっており、外筒部１１の前端部内周面に全周に亘って設けられた凹部１１ｂに嵌合するようになっている。而して、被検出部３を軸受３１に挿入して外筒部１１内に配設することで、被検出部３の移動方向を前後方向のみに規制して被検出部３が傾斜するのを防いでいる。また、被検出部３後端の開口縁には、径方向に突出する突部３ａが形成されている。而して、被検出部３を前方向に移動させた際に、突部３ａが軸受３１に当接することで被検出部３が外筒部１１から抜けるのを防いでいる。   The detected part 3 is provided with a substantially annular bearing 31 that supports the detected part 3 slidably in the front-rear direction. The inner diameter of the bearing 31 is substantially the same as the outer diameter of the detected portion 3 so that the bearing 31 fits into the recess 11 b provided on the inner peripheral surface of the front end portion of the outer cylinder portion 11 over the entire circumference. It has become. Thus, by inserting the detected portion 3 into the bearing 31 and disposing the detected portion 3 in the outer cylindrical portion 11, the detected portion 3 is inclined while restricting the moving direction of the detected portion 3 only in the front-rear direction. Is preventing. Further, a protruding portion 3 a protruding in the radial direction is formed at the opening edge of the rear end of the detected portion 3. Thus, when the detected portion 3 is moved in the forward direction, the detected portion 3 is prevented from coming out of the outer cylinder portion 11 due to the protrusion 3 a coming into contact with the bearing 31.

外筒部１１の前端部には、その開口を塞ぐとともに軸受３１と被検出部３との隙間を覆う保持部材５が設けられている。保持部材５は、例えば樹脂材料から形成され、その内側面が外筒部１１の外側面と密着する径寸法の有底円筒状の第１の筒部５ａと、第１の筒部よりも僅かに小さい径寸法を有する略円筒状の第２の筒部５ｂとから成る。尚、第１の筒部５ａの底部には、被検出部３を挿通させる挿通孔が貫設されている。   A holding member 5 is provided at the front end portion of the outer cylinder portion 11 so as to close the opening and cover the gap between the bearing 31 and the detected portion 3. The holding member 5 is formed of, for example, a resin material, and has a first cylindrical portion 5a having a bottomed cylindrical shape whose inner side surface is in close contact with the outer side surface of the outer cylindrical portion 11, and slightly more than the first cylindrical portion. And a substantially cylindrical second cylindrical portion 5b having a small diameter. An insertion hole through which the detected portion 3 is inserted is provided at the bottom of the first cylindrical portion 5a.

外筒部１１前端部の外周面には、図１（ｂ）に示すように、周方向に沿って複数（図示では２つ）の嵌合突起１１ａが設けられている。また、第１の筒部５ａには、図１（ａ）に示すように、周方向に沿って略矩形状の嵌合孔５ｃが複数（図示では３つ）設けられており、外筒部１１の嵌合突起１１ａを保持部材５の嵌合孔５ｃに嵌合させることで、保持部材５が外筒部１１に取り付けられる。ここで、嵌合突起１１ａには前側から後側に向かうにつれて外方向に突出する傾斜面が設けられている。このため、嵌合突起１１ａを嵌合孔５ｃに嵌合する際に、嵌合孔５ｃの内周縁が当該傾斜面に案内されることで容易に嵌合できるようになっている。而して、第１の筒部５ａの底部によって軸受３１の前端部を保持することで軸受３１の脱落を防止するとともに、第２の筒部５ｂによって軸受３１と被検出部３との隙間が覆われるので、水や塵埃等の異物が該隙間に侵入するのを防ぐことができる。   As shown in FIG. 1B, a plurality (two in the drawing) of fitting protrusions 11a are provided on the outer peripheral surface of the front end portion of the outer cylinder portion 11 along the circumferential direction. Further, as shown in FIG. 1 (a), the first cylindrical portion 5a is provided with a plurality (three in the drawing) of substantially rectangular fitting holes 5c along the circumferential direction. The holding member 5 is attached to the outer cylinder portion 11 by fitting the 11 fitting protrusions 11 a into the fitting holes 5 c of the holding member 5. Here, the fitting protrusion 11a is provided with an inclined surface that protrudes outwardly from the front side toward the rear side. For this reason, when fitting the fitting projection 11a into the fitting hole 5c, the inner peripheral edge of the fitting hole 5c is guided by the inclined surface so that it can be easily fitted. Thus, the front end portion of the bearing 31 is held by the bottom portion of the first cylindrical portion 5a to prevent the bearing 31 from falling off, and the second cylindrical portion 5b creates a gap between the bearing 31 and the detected portion 3. Since it is covered, foreign substances such as water and dust can be prevented from entering the gap.

上述のように、車体に取り付けられた検出部２に対する車軸に取り付けられた被検出部３の前後方向の移動による変位を検出コイルのインピーダンス変化を利用して検出することで車体と車軸との間の距離を測定することができるので、従来例のように車体と車軸との間に介在する連結部材等の部品を必要とせず変位を直接検出でき、したがって部品毎の誤差が生じることがなく検出精度を向上することができる。また、連結部材等の部品を配設するためのスペースが必要とならないため、省スペース化を図ることができる。   As described above, the displacement between the detected portion 3 attached to the axle relative to the detecting portion 2 attached to the vehicle body due to the movement in the front-rear direction is detected using the impedance change of the detection coil, so that the gap between the vehicle body and the axle is detected. The distance can be measured, so that it is possible to detect the displacement directly without the need for parts such as connecting members interposed between the vehicle body and the axle as in the conventional example, so that there is no error for each part. Accuracy can be improved. In addition, a space for arranging components such as a connecting member is not required, and thus space saving can be achieved.

ところで、図３に示すように、筐体１の基台部１０を前後方向と直交する何れかの方向に延設し、延設した部位に車体に基台部１０をねじ止めするための車体用取付孔１０ｅ（図示では略円形状）を貫設してもよい。この場合、従来例のように車体側ブラケット１０２を介さずに直接ポジションセンサを車体に取り付けることができるので、部品点数を削減することができる。   By the way, as shown in FIG. 3, the vehicle body for extending the base part 10 of the housing | casing 1 in any direction orthogonal to the front-back direction and screwing the base part 10 to the vehicle body in the extended part. A mounting hole 10e (substantially circular in the figure) may be provided. In this case, since the position sensor can be directly attached to the vehicle body without using the vehicle body side bracket 102 as in the conventional example, the number of parts can be reduced.

本発明に係るポジションセンサの実施形態を示す図で、（ａ）は全体斜視図で、（ｂ）は断面図である。It is a figure which shows embodiment of the position sensor which concerns on this invention, (a) is a whole perspective view, (b) is sectional drawing. 同上の要部説明図で、（ａ）は内筒部を示す断面図で、（ｂ）は下端部の分解斜視図である。It is principal part explanatory drawing same as the above, (a) is sectional drawing which shows an inner cylinder part, (b) is a disassembled perspective view of a lower end part. 同上の基台部の他の形態を示す一部拡大した斜視図である。It is the partially expanded perspective view which shows the other form of the base part same as the above. 従来のポジションセンサを示す平面図である。It is a top view which shows the conventional position sensor.

符号の説明Explanation of symbols

１ 筐体
１０ｄ 突起
１３ 内筒部
２ 検出部
２０ コイルボビン
２０ｃ 取付孔
２１ 回路ブロック
３ 被検出部
３０ キャップ
３０ｂ 通孔
３１ 軸受
５ 保持部材 DESCRIPTION OF SYMBOLS 1 Case 10d Protrusion 13 Inner cylinder part 2 Detection part 20 Coil bobbin 20c Mounting hole 21 Circuit block 3 Detected part 30 Cap 30b Through-hole 31 Bearing 5 Holding member

Claims (4)

車体又は車軸の何れか一方の側に取り付けられて検出コイルを有する検出部と、前記他方の側に取り付けられて検出コイルに対して所定の方向に移動可能な被検出部と、検出コイルに所定の周波数及び振幅の電流を供給する駆動回路部、並びに駆動回路部が出力した電流及び検出コイルのインピーダンスにより決まる電圧信号を検出部に対する被検出部の位置情報を示す出力信号に変換する信号処理回路部を有する回路ブロックと、検出部及び被検出部及び回路ブロックを収納する筐体とを備え、検出部に対する被検出部の変位を検出するポジションセンサであって、被検出部は、前記移動方向における両端が開口した筒状に形成され、検出部は、前記移動方向における一端から被検出部の内側に入り込む形に配置されたことを特徴とするポジションセンサ。   A detection unit attached to one of the vehicle body and the axle and having a detection coil, a detected portion attached to the other side and movable in a predetermined direction with respect to the detection coil, and a predetermined detection coil Drive circuit section for supplying a current having a frequency and amplitude, and a signal processing circuit for converting a voltage signal determined by the current output from the drive circuit section and the impedance of the detection coil into an output signal indicating position information of the detected section relative to the detection section A position sensor for detecting a displacement of the detected portion relative to the detecting portion, wherein the detected portion has the moving direction. The detector is formed in a cylindrical shape having both ends opened, and the detection unit is arranged so as to enter the inside of the detection unit from one end in the moving direction. Deployment sensor. 前記検出部は、検出コイルが巻回されるコイルボビンを有し、筐体には、コイルボビンが挿入され且つ検出部及び回路ブロックを収納する空間と被検出部を収納する空間とを隔てる有底筒状の内筒部が一体に形成されるとともに、コイルボビンに貫設された取付孔に挿入されてコイルボビンをかしめ固定するための突起が設けられたことを特徴とする請求項１記載のポジションセンサ。   The detection unit has a coil bobbin around which a detection coil is wound, and the casing has a bottomed cylinder in which a coil bobbin is inserted and a space for storing the detection unit and the circuit block is separated from a space for storing the detection unit. 2. The position sensor according to claim 1, wherein the inner cylindrical portion is integrally formed, and a protrusion is provided for caulking and fixing the coil bobbin by being inserted into an attachment hole penetrating the coil bobbin. 前記被検出部には、被検出部を前記移動方向に摺動自在に支持する軸受が設けられ、筐体には、軸受を保持するとともに被検出部と軸受との隙間を覆う保持部材が設けられたことを特徴とする請求項１又は２記載のポジションセンサ。   The detected portion is provided with a bearing that slidably supports the detected portion in the moving direction, and the housing is provided with a holding member that holds the bearing and covers a gap between the detected portion and the bearing. The position sensor according to claim 1 or 2, wherein the position sensor is provided. 前記被検出部の前記移動方向における一端には、該一端の開口を塞ぐキャップが設けられ、該キャップに前記移動方向に貫通する通孔を設けたことを特徴とする請求項１乃至３の何れか１項に記載のポジションセンサ。   4. The cap according to claim 1, wherein a cap for closing the opening of the one end is provided at one end in the moving direction of the detected portion, and a through-hole penetrating in the moving direction is provided in the cap. The position sensor according to claim 1.
JP2008044855A 2008-02-26 2008-02-26 Position sensor Pending JP2009204346A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015148573A (en) * 2014-02-07 2015-08-20 三菱重工業株式会社 Control piston position detecting device and swash plate type variable capacity type hydraulic device using the same as well as manufacturing method of control piston position detecting device and control method of swash plate type variable capacity type hydraulic system

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