JP2019148502A - Liquid level detection device - Google Patents

Liquid level detection device Download PDF

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JP2019148502A
JP2019148502A JP2018033484A JP2018033484A JP2019148502A JP 2019148502 A JP2019148502 A JP 2019148502A JP 2018033484 A JP2018033484 A JP 2018033484A JP 2018033484 A JP2018033484 A JP 2018033484A JP 2019148502 A JP2019148502 A JP 2019148502A
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liquid level
liquid
detection device
wall portion
level detection
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龍二 吉田
Ryuji Yoshida
龍二 吉田
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Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
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Abstract

To provide a liquid level detection device that enables a simple structure to prevent a contact of a terminal with a liquid, and can prevent electric corrosion.SOLUTION: A liquid level detection device 100 is configured to comprise: a holder (a revolving member) 20 that revolves around a rotation axis 10a accompanied by a change in height of a liquid; a main body part (a support member) 50 that rotatably supports the holder (the revolving member) 20; a magnetic detection unit (a detection unit) 30 that is provided in the main body part (the support member) 50, and electrically detects the change in height of the liquid in responce to a revolving location of the holder (the revolving member) 20; a plurality of external terminals (terminal members) 70 that is provided in a location lower than a liquid level at full liquid, and electrically connects the magnetic detection unit (the detection unit) 30 to externals; and a cylindrical member 80 that includes a wall part 81 surrounding around the plurality of external terminal (the terminal members) 70, and a bottom part 82 located on a liquid level side at the full liquid in the wall part 81, and is shaped into a bottomed cylinder having an end surface 83 on a side opposite the bottom part 82 opened.SELECTED DRAWING: Figure 2

Description

本発明は、液面検出装置に関する。   The present invention relates to a liquid level detection device.

例えば、特許文献1に開示された液面検出装置では、磁石と、磁石の周囲を囲むホルダとを備え、磁石の中心軸を中心にホルダを一体に回転するようにし、液面の変動に伴って変位するフロートをホルダに連結することで、ホルダに固定した磁石の回動に伴う磁気変化から磁気検出素子で液体燃料のタンクなどの液面を検出する。磁気検出素子は、外部と複数の端子を介して電気的に接続され、電源の供給や検出信号の取り出しが行われる。
複数の端子は、燃料中に浸漬されると、隣接する端子間の電位差により電食が発生する虞があり、各端子の周囲を少なくとも3つの壁部と2つの蓋部とで複数に区画し、金属イオンの流動経路を長くすることで電食を抑えるようにしている。
For example, the liquid level detection device disclosed in Patent Document 1 includes a magnet and a holder that surrounds the magnet, and the holder is integrally rotated about the central axis of the magnet. By connecting the float which is displaced in this manner to the holder, the liquid level of the liquid fuel tank or the like is detected by the magnetic detection element from the magnetic change accompanying the rotation of the magnet fixed to the holder. The magnetic detection element is electrically connected to the outside via a plurality of terminals, and power is supplied and detection signals are taken out.
When a plurality of terminals are immersed in fuel, there is a possibility that electrolytic corrosion may occur due to a potential difference between adjacent terminals, and each terminal is divided into a plurality of sections by at least three wall portions and two lid portions. In order to suppress electrolytic corrosion, the flow path of metal ions is lengthened.

特開2011−185616号公報JP 2011-185616 A

特許文献1では、各端子を複数に区画するための少なくとも3つの壁部と2つの蓋部とを必要とし、構造が複雑になるという問題がある。   In Patent Document 1, at least three wall portions and two lid portions for partitioning each terminal into a plurality of parts are required, and there is a problem that the structure becomes complicated.

本発明は、上記問題点に鑑みてなされたものであり、簡単な構造で端子と液体との接触を防止し、電食を防止することができる液面検出装置を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid level detection device capable of preventing contact between a terminal and a liquid with a simple structure and preventing electrolytic corrosion. .

上記目的を達成するため、本発明の液面検出装置は、
液体の液面の高さの変化に伴い回転軸を中心に回動する回動部材と、
前記回動部材を回動可能に支持する支持部材と、
前記支持部材に設けられ、前記回動部材の回動位置に応じた前記液面の高さの変化を電気的に検出する検出部と、
満液時の前記液面よりも低い位置に設けられ、前記検出部と外部とを電気的に接続する複数の端子部材と、
前記複数の端子部材の周囲を囲む壁部及び前記壁部における満液時の前記液面側に位置する底部を含み、前記底部と反対側の端面が開口する有底筒状をなす筒状部材と、を備える、
ことを特徴とする。
In order to achieve the above object, the liquid level detection device of the present invention comprises:
A rotating member that rotates about a rotation axis as the liquid level of the liquid changes,
A support member that rotatably supports the rotating member;
A detection unit that is provided on the support member and electrically detects a change in height of the liquid surface according to a rotation position of the rotation member;
A plurality of terminal members that are provided at a position lower than the liquid level when full, and electrically connect the detection unit and the outside;
A cylindrical member having a bottomed cylindrical shape including a wall portion surrounding the periphery of the plurality of terminal members and a bottom portion located on the liquid surface side when the wall portion is full, and an end surface opposite to the bottom portion is open. And comprising
It is characterized by that.

本発明によれば、簡単な構造で端子と液体との接触を防止し、電食を防止することができる。   According to the present invention, the contact between the terminal and the liquid can be prevented with a simple structure, and electrolytic corrosion can be prevented.

本発明の液面検出装置の一実施の形態を示す正面図である。It is a front view which shows one Embodiment of the liquid level detection apparatus of this invention. 本発明の一実施の形態の縦断面図である。It is a longitudinal cross-sectional view of one embodiment of this invention. 本発明の一実施の形態の概略分解斜視図である。1 is a schematic exploded perspective view of an embodiment of the present invention. 本発明の一実施の形態の磁石の外観斜視図である。It is an external appearance perspective view of the magnet of one embodiment of the present invention. 本発明の一実施の形態のホルダ(回動部材)の外観斜視図である。It is an external appearance perspective view of the holder (rotating member) of one embodiment of this invention. 本発明の一実施の形態の磁気検出部(検出部)の正面図である。It is a front view of the magnetic detection part (detection part) of one embodiment of this invention. 本発明の一実施の形態の本体部の概略拡大図である。It is a schematic enlarged view of the main-body part of one embodiment of this invention.

以下に、本発明の一実施の形態に係る液面検出装置を添付図面に基づいて説明する。
液面検出装置100は磁石10と、ホルダ(回動部材)20と、磁気検出部(検出部)30と、フロート40と、本体部(支持部材)50と、カバー60と、外部端子(端子部材)70と、筒状部材80と、を備える(図1〜図3参照)。
液面検出装置100は、例えば、ガソリンなどの液体燃料を貯留する図示しない燃料タンク内に設置され、液位に応じて液体中に浮くフロート40の上下動(変位)をホルダ20に伝達する。磁石10が取り付けられたホルダ20は、水平軸回りに回動可能に本体部50に支持される。本体部50には、磁石10の中心軸(回転軸)10aの延長線上に設けられ、ホルダ20と対向して磁気検出素子31を備えた磁気検出部30が設けられる。
これにより、磁気検出部30の磁気検出素子31で、フロート40の変位によるホルダ20の回動に伴う磁石10の磁気変化を検出することで、液面の高さを検出する。
なお、以下の説明では、液面検出装置100として使用する図1,2に示す状態での燃料タンクの液体貯留側を表側(左側)とし、燃料タンクの側壁やブラケット等への取付側を裏側(右側)として説明する。
Hereinafter, a liquid level detection device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The liquid level detection device 100 includes a magnet 10, a holder (rotating member) 20, a magnetic detection unit (detection unit) 30, a float 40, a main body (support member) 50, a cover 60, an external terminal (terminal). Member) 70 and the cylindrical member 80 (refer FIGS. 1-3).
The liquid level detection device 100 is installed, for example, in a fuel tank (not shown) that stores liquid fuel such as gasoline, and transmits the vertical movement (displacement) of the float 40 floating in the liquid to the holder 20 according to the liquid level. The holder 20 to which the magnet 10 is attached is supported by the main body 50 so as to be rotatable around a horizontal axis. The main body 50 is provided with a magnetic detection unit 30 that is provided on an extension line of the central axis (rotation axis) 10 a of the magnet 10 and that has a magnetic detection element 31 facing the holder 20.
Thereby, the magnetic detection element 31 of the magnetic detection unit 30 detects the magnetic change of the magnet 10 accompanying the rotation of the holder 20 due to the displacement of the float 40, thereby detecting the height of the liquid level.
In the following description, the liquid storage side of the fuel tank in the state shown in FIGS. 1 and 2 used as the liquid level detection device 100 is the front side (left side), and the side of the fuel tank attached to the side wall or bracket is the back side. (Right side)

磁石10は、円柱形状とされ、例えば、ネオジムやフェライト材料などからなり、磁石10の着磁は、ここでは、2極着磁である。磁石10は、周囲がホルダ(回動部材)20に囲まれる。磁石10は、ホルダ20に収納された状態で磁石10の中心軸10aを中心にホルダ20と一体に回動される。また、磁石10は、ホルダ20と結合させるため少なくとも一方の端面11、図示例では、表側(図4の上側)の端面11aに保持用凹部13が形成されている(図4参照)。保持用凹部13は、磁石10に対するホルダ20の回転方向の接線に対し、直交した方向に設けられており、ここでは、磁石10の中心軸10aを通る半径方向に形成してある。磁石10の保持用凹部13は、ホルダ20のインサート成形の際に樹脂が入ることで嵌合する凸状部(図示せず)が形成され磁石10とホルダ20との回り止め機能を果たしている。
なお、保持用凹部13は、磁石10の端面11の一直線上に形成したが、1直線上で分断して複数形成したり、直線上でない位置に複数形成しても良く、ホルダ20と磁石10との回り止めができれば良い。
また、保持用凹部13は、磁石10の表側の端面11aに設ける場合に限らず、裏側の端面11bに設けたり、表裏両側の端面11に設けるようにしても良い。
The magnet 10 has a cylindrical shape, and is made of, for example, neodymium or a ferrite material, and the magnet 10 is magnetized in this case with two poles. The periphery of the magnet 10 is surrounded by a holder (rotating member) 20. The magnet 10 is rotated integrally with the holder 20 around the central axis 10 a of the magnet 10 while being accommodated in the holder 20. Further, the magnet 10 has a holding recess 13 formed on at least one end surface 11, in the illustrated example, the end surface 11 a on the front side (upper side in FIG. 4) in order to be coupled with the holder 20 (see FIG. 4). The holding recess 13 is provided in a direction orthogonal to the tangent to the rotation direction of the holder 20 with respect to the magnet 10. Here, the holding recess 13 is formed in a radial direction passing through the central axis 10 a of the magnet 10. The concave portion 13 for holding the magnet 10 is formed with a convex portion (not shown) that fits when resin is inserted during insert molding of the holder 20, and functions to prevent the magnet 10 and the holder 20 from rotating.
The holding recesses 13 are formed on a straight line on the end surface 11 of the magnet 10. However, the holding recesses 13 may be formed by dividing on one straight line, or may be formed at positions not on the straight line. I just want to be able to prevent rotation.
Further, the holding recess 13 is not limited to being provided on the front end surface 11 a of the magnet 10, but may be provided on the back end surface 11 b or on the front and back end surfaces 11.

ホルダ(回動部材)20は、ポリアセタールなどの樹脂材料からなり、磁石10がインサート成形によって周囲が囲まれて固定されている。
ホルダ20は、磁石10の側周面12を囲んで保持する円筒状の円筒部(側面)20aと、円筒部20aの両端(表裏側)を塞ぐ端面20b,20cとで一体に構成されている(図5参照)。
ホルダ20には、裏側の端面20cに、中心部に貫通する孔状の回動軸受部25が形成される(図2参照)。回動軸受部25は、内周面が、後述する本体部50の円柱状の回動軸部53の外周面と摺接して回動可能に支持される。磁石10は、孔状の回動軸受部25によって磁石10の裏側の一部がホルダ20から露出している。
ホルダ20には、図5に示すように、表側の端面20bに円筒状の回動軸部26が表側に突き出すように一体に形成される。回動軸部26は、外周面が、後述する本体部50の表側を覆うカバー60の回動軸受部61の内周面と摺接して回動可能に支持される(図2参照)。
これにより、磁石10が取り付けられたホルダ20は、裏側が回動軸受部25と本体部50の回動軸部53で支持され、表側が回動軸部26とカバー60の回動軸受部61で支持されることで、磁石10の中心軸10aである水平軸回りに一直線上で回動可能に本体部50およびカバー60で支持される(図2など参照)。
The holder (rotating member) 20 is made of a resin material such as polyacetal, and the magnet 10 is surrounded and fixed by insert molding.
The holder 20 is integrally formed of a cylindrical cylindrical portion (side surface) 20a that surrounds and holds the side peripheral surface 12 of the magnet 10 and end surfaces 20b and 20c that block both ends (front and back sides) of the cylindrical portion 20a. (See FIG. 5).
The holder 20 is formed with a hole-like rotation bearing portion 25 penetrating through the center portion on the end surface 20c on the back side (see FIG. 2). The rotary bearing portion 25 is supported so that its inner peripheral surface is slidably in contact with the outer peripheral surface of a columnar rotary shaft portion 53 of the main body portion 50 described later. A part of the magnet 10 on the back side of the magnet 10 is exposed from the holder 20 by the hole-shaped rotation bearing portion 25.
As shown in FIG. 5, the holder 20 is integrally formed with a cylindrical rotation shaft portion 26 protruding from the front side end face 20 b to the front side. The rotating shaft part 26 is supported so that the outer peripheral surface is slidable in contact with the inner peripheral surface of the rotating bearing part 61 of the cover 60 that covers the front side of the main body part 50 described later (see FIG. 2).
As a result, the holder 20 to which the magnet 10 is attached is supported on the back side by the rotary bearing portion 25 and the rotary shaft portion 53 of the main body portion 50, and on the front side by the rotary shaft portion 26 and the rotary bearing portion 61 of the cover 60. Is supported by the main body 50 and the cover 60 so as to be rotatable in a straight line around the horizontal axis that is the central axis 10a of the magnet 10 (see FIG. 2 and the like).

このようなホルダ20は、磁石10がインサート成形によって固定されるが、ホルダ20は、磁石10の金型へのセット時に、磁石10の側周面12を押えるための側周面12に連通する第1の溝部21と、磁石10の表側の端面11aを押えるための端面11aに連通する第2の溝部22を備える。
第1の溝部21は、ホルダ20の表側の端面20bから中間部まで磁石10の側周面12に連通するよう開口して略円弧状に形成される。
第2の溝部22は、ホルダ20の表側の端面20bに一端が開口し、他端が磁石10の表側の端面11aに連通するように円柱状に開口して形成される。
これら第1の溝部21および第2の溝部22は、成形の際、金型に取り付けて磁石10をセットするための第1の位置決め部および第2の位置決めピンによって、成形後にホルダ20の側面である円筒部20aおよび表側の端面20bに残る溝部である(図5参照)。
これら第1の溝部21および第2の溝部22は、磁石10の保持用凹部13と干渉しない位置に形成される。ここでは、保持用凹部13を磁石10の中心軸10aを通る半径方向に形成し、第1の溝部21は保持用凹部13の両端部と重ならない位置に形成され、第2の溝部22は、保持用凹部13上で重ならない位置に形成することで、干渉を避けるようにしている。
In such a holder 20, the magnet 10 is fixed by insert molding, but the holder 20 communicates with the side peripheral surface 12 for pressing the side peripheral surface 12 of the magnet 10 when the magnet 10 is set in a mold. A first groove portion 21 and a second groove portion 22 communicating with the end surface 11a for pressing the front end surface 11a of the magnet 10 are provided.
The first groove portion 21 is formed in a substantially arc shape that opens to communicate with the side circumferential surface 12 of the magnet 10 from the end surface 20b on the front side of the holder 20 to the intermediate portion.
The second groove portion 22 is formed in a cylindrical shape so that one end is opened on the front end surface 20 b of the holder 20 and the other end communicates with the front end surface 11 a of the magnet 10.
The first groove portion 21 and the second groove portion 22 are formed on the side surface of the holder 20 after molding by a first positioning portion and a second positioning pin that are attached to the mold and set the magnet 10 during molding. It is a groove part remaining on a certain cylindrical part 20a and the front end face 20b (see FIG. 5).
The first groove 21 and the second groove 22 are formed at positions that do not interfere with the holding recess 13 of the magnet 10. Here, the holding concave portion 13 is formed in the radial direction passing through the central axis 10a of the magnet 10, the first groove portion 21 is formed at a position that does not overlap with both end portions of the holding concave portion 13, and the second groove portion 22 is By forming it at a position that does not overlap on the holding recess 13, interference is avoided.

このように構成した磁石10および磁石10を内蔵したホルダ20は、磁石10の中心軸10aを中心に回動可能に支持し、ホルダ20の磁石10が磁気検出部30の磁気検出素子31の磁気検出面に対向するように配置する。
これにより、ホルダ20の回動動作に伴う磁石10の磁気変化を磁気検出素子31で検出することができる。
The magnet 10 configured as described above and the holder 20 incorporating the magnet 10 are rotatably supported around the central axis 10 a of the magnet 10, and the magnet 10 of the holder 20 is magnetized by the magnetic detection element 31 of the magnetic detection unit 30. It arrange | positions so that a detection surface may be opposed.
Thereby, the magnetic change of the magnet 10 accompanying the rotation operation of the holder 20 can be detected by the magnetic detection element 31.

液面検出装置100は、ホルダ20に、液面の高さの変化に伴って変位するフロート40を連結して構成され、上記構成に加え、磁石10の中心軸10aと対向する磁気検出素子31を備えた磁気検出部30と、磁石10が取り付けられたホルダ20の一端を回動可能に支持する本体部50と、本体部50を覆ってホルダ20の他端を回動可能に支持するカバー60と、外部端子(端子部材)70と、外部端子70の電食を防止する筒状部材80と、を備えて構成されている。
ホルダ20には、中間部の外周にアーム保持部27が形成されており、アーム保持部27に、液位に応じて上下動するフロート40に連結されたフロートアーム41が固定されている。これにより、フロート40の上下動がフロートアーム41に伝達され、フロートアーム41を介してホルダ20が本体部50の回動軸部53と回動軸受部61を中心に回動される。
The liquid level detection device 100 is configured by connecting the holder 20 to a float 40 that is displaced as the liquid level changes, and in addition to the above configuration, the magnetic detection element 31 facing the central axis 10a of the magnet 10. A main body 50 that rotatably supports one end of the holder 20 to which the magnet 10 is attached, and a cover that covers the main body 50 and rotatably supports the other end of the holder 20. 60, an external terminal (terminal member) 70, and a cylindrical member 80 that prevents electrolytic corrosion of the external terminal 70.
The holder 20 has an arm holding portion 27 formed on the outer periphery of the intermediate portion, and a float arm 41 connected to a float 40 that moves up and down according to the liquid level is fixed to the arm holding portion 27. Thus, the vertical movement of the float 40 is transmitted to the float arm 41, and the holder 20 is rotated about the rotation shaft portion 53 and the rotation bearing portion 61 of the main body portion 50 via the float arm 41.

本体部50は、樹脂材料、例えばガラス繊維入りポリアセタール等が用いられ、内側となる第1の樹脂体51と、第1の樹脂体51を覆って外側となる第2の樹脂体52とで構成される。本体部50は、ガラス繊維入り樹脂を用いることにより線膨張係数を小さくし、磁気検出部30の樹脂体34をアウトサート成形する際に、樹脂体34への熱による樹脂の膨張収縮による応力を緩和させ、リード端子32,32aの断線など接続不良を防ぐようにする。
本体部50は、表側(図2中の左側)に円柱状の回動軸部53が一体に形成され、回動軸部53にホルダ20の回動軸受部25が回動可能に装着されている。すなわち、回動軸部53は、本体部50を構成する第2の樹脂体52に形成されている。これにより、ホルダ20が本体部50の回動軸部53に対して水平軸回りに回動可能に支持される。
The main body 50 is made of a resin material, such as polyacetal containing glass fiber, and includes a first resin body 51 that is on the inside and a second resin body 52 that is on the outside and covers the first resin body 51. Is done. The main body 50 uses a resin containing glass fiber to reduce the linear expansion coefficient, and when the resin body 34 of the magnetic detection unit 30 is outsert-molded, the main body 50 receives stress due to expansion and contraction of the resin due to heat to the resin body 34. Alleviate the connection to prevent connection failure such as disconnection of the lead terminals 32 and 32a.
The main body portion 50 is integrally formed with a columnar rotation shaft portion 53 on the front side (left side in FIG. 2), and the rotation bearing portion 25 of the holder 20 is rotatably mounted on the rotation shaft portion 53. Yes. That is, the rotation shaft portion 53 is formed on the second resin body 52 constituting the main body portion 50. Thereby, the holder 20 is supported so as to be rotatable around the horizontal axis with respect to the rotation shaft portion 53 of the main body portion 50.

本体部50は、図2及び図3に示すように、本体部50の裏側で、外側に突き出す固定用位置決め部54が形成されるとともに、固定対象の図示しない係止孔に係止して固定する固定用フック55が一体に形成される。すなわち、固定用位置決め部54及び固定用フック55は、本体部50を構成する第2の樹脂体52に一体に形成され、これにより、固定用位置決め部54で位置決めし、両側の固定用フック55を係止することで、液体燃料タンクなどの所定の位置に液面検出装置100を設置することができる。   As shown in FIGS. 2 and 3, the main body 50 is formed with a fixing positioning portion 54 protruding outward on the back side of the main body 50, and is fixed by being locked in a locking hole (not shown) to be fixed. The fixing hook 55 is integrally formed. That is, the fixing positioning portion 54 and the fixing hook 55 are formed integrally with the second resin body 52 constituting the main body portion 50, and are thereby positioned by the fixing positioning portion 54, and the fixing hooks 55 on both sides are formed. The liquid level detecting device 100 can be installed at a predetermined position such as a liquid fuel tank.

本体部50には、図7に示すように、表側の内部に磁気検出素子31を備える磁気検出部30が設けられる。
磁気検出部30は、ホルダ20に収納された磁石10と対向して磁気検出素子31が配置され、ホルダ20の回動動作に伴う磁石10の磁気変化を磁気検出素子31によって検出する。磁気検出素子31は、例えば、ホールICなどで構成される。
As shown in FIG. 7, the main body 50 is provided with a magnetic detection unit 30 including a magnetic detection element 31 inside the front side.
In the magnetism detection unit 30, a magnetism detection element 31 is disposed so as to face the magnet 10 accommodated in the holder 20, and the magnetism detection element 31 detects a magnetic change of the magnet 10 due to the rotation operation of the holder 20. The magnetic detection element 31 is composed of, for example, a Hall IC.

磁気検出部30は、図6に示すように、磁気検出素子31及び電子部品35を樹脂に内蔵した樹脂体34として構成される。樹脂体34は、磁気検出素子31が内蔵された樹脂体34aと電子部品35が内蔵された樹脂体34bとで構成されている。
磁気検出素子31が内蔵された樹脂体34aでは、樹脂体34a(磁気検出素子31)の4角形状の4側面の内の1側面、図示例の状態では、下方となる側面にリード端子32が突き出すように設けられている。さらに、磁気検出素子31が内蔵された樹脂体34aは、樹脂体34a(磁気検出素子31)からリード端子32が突き出す側面の両側の側面(図示例の左右側面)に1対の被固定部33が対角位置(右側は上方で、反対の左側は下方)に突き出すように設けられている。被固定部33は、板状に形成され、樹脂体34の厚みより薄く形成してある。
被固定部33は、後述する本体部50への位置決めに用いられるほか、磁気検出素子31の接地用の端子と兼用される。
As shown in FIG. 6, the magnetic detection unit 30 is configured as a resin body 34 in which a magnetic detection element 31 and an electronic component 35 are built in resin. The resin body 34 includes a resin body 34a in which the magnetic detection element 31 is built and a resin body 34b in which the electronic component 35 is built.
In the resin body 34a in which the magnetic detection element 31 is built, the lead terminal 32 is provided on one side surface of the four rectangular sides of the resin body 34a (magnetic detection element 31), or in the illustrated example, on the lower side surface. It is provided to protrude. Further, the resin body 34a in which the magnetic detection element 31 is incorporated has a pair of fixed portions 33 on both side surfaces (left and right side surfaces in the illustrated example) of the side surface from which the lead terminal 32 protrudes from the resin body 34a (magnetic detection element 31). Is provided so as to protrude diagonally (upward on the right side and downward on the opposite left side). The fixed part 33 is formed in a plate shape and is thinner than the thickness of the resin body 34.
The fixed portion 33 is used for positioning to the main body portion 50 described later, and also serves as a grounding terminal of the magnetic detection element 31.

磁気検出部30は、ノイズ吸収用のコンデンサや抵抗で構成された電子部品35を備えており、電子部品35は、磁気検出素子31のリード端子32と電気的に接続される。電子部品35は、樹脂に内蔵されて樹脂体34bとして構成されている。
電子部品35が内蔵された樹脂体34bでは、樹脂体34b(電子部品35)の4角形状の1側面である下方の側面からリード端子32aがリード端子32と同様に、下方に突き出すように設けられ、樹脂体34b(電子部品35)の左右両側の側面からは、被固定部33aが対角位置(右側は下方に、反対の左側は上方)に突き出すように設けられている。被固定部33aは、板状に形成され、樹脂体34の厚みより薄く形成してある。
被固定部33aは、被固定部33と同様、後述する本体部50への位置決めに用いられるほか、電子部品35の接地用の端子と兼用される。
The magnetic detection unit 30 includes an electronic component 35 composed of a noise absorbing capacitor and a resistor, and the electronic component 35 is electrically connected to the lead terminal 32 of the magnetic detection element 31. The electronic component 35 is built in a resin and configured as a resin body 34b.
In the resin body 34b in which the electronic component 35 is embedded, the lead terminal 32a is provided so as to protrude downward from the lower side surface, which is one side surface of the rectangular shape of the resin body 34b (electronic component 35), like the lead terminal 32. In addition, the fixed portion 33a is provided so as to protrude diagonally (downward on the right side and upward on the opposite left side) from the left and right side surfaces of the resin body 34b (electronic component 35). The fixed portion 33 a is formed in a plate shape and is formed thinner than the thickness of the resin body 34.
The fixed portion 33 a is used for positioning to a main body portion 50 described later, as well as the fixed portion 33, and is also used as a grounding terminal of the electronic component 35.

磁気検出部30では、リード端子32aは、図7に示すように、3つの端子で構成されている。
3つの端子のうち接地される接地リード端子32agが、樹脂体34の内部で、磁気検出素子31及び電子部品35の周囲を囲むように配置される。そして、接地リード端子32agは、被固定部33,33aと樹脂体34a,34bの内部で電気的に接続されている。
2つのリード端子32aと接地リード端子32agは、後述する本体部50の3つの接続端子56の外側端部56aと一体に形成された外部端子(端子部材)70に接続される。
外部端子(端子部材)70は、本体部50の外部に露出して形成されており、外部端子70に3本のリード線71が接続されて外部に導出され、電源供給や検出信号の取り出しが行われる。
In the magnetic detection unit 30, the lead terminal 32a includes three terminals as shown in FIG.
Among the three terminals, a ground lead terminal 32ag that is grounded is disposed inside the resin body 34 so as to surround the periphery of the magnetic detection element 31 and the electronic component 35. The ground lead terminal 32ag is electrically connected inside the fixed portions 33 and 33a and the resin bodies 34a and 34b.
The two lead terminals 32a and the ground lead terminal 32ag are connected to an external terminal (terminal member) 70 formed integrally with an outer end portion 56a of three connection terminals 56 of the main body 50 described later.
The external terminal (terminal member) 70 is formed so as to be exposed to the outside of the main body portion 50, and three lead wires 71 are connected to the external terminal 70 and led to the outside so that power supply and detection signals can be taken out. Done.

樹脂体34に内蔵された磁気検出部30は、本体部50に実装される。
本体部50を構成する内側となる第1の樹脂体51には、図7に示すように、導電性を備えた金属製で板状の接続端子56がインサート成形されている。接続端子56は、例えば3つの接続端子56で構成されており、接続端子56の外側端部56aが第1の樹脂体51の先端部の表側に露出し、外側端部56aと一体に外部端子70が設けられている。
接続端子56の内側端部56bは、第1の樹脂体51の中間部の表側に露出し、接続端子56の外側端部56aと内側端部56bの中間部が第1の樹脂体51に埋設(インサート)されて固定されている。
The magnetic detection unit 30 built in the resin body 34 is mounted on the main body unit 50.
As shown in FIG. 7, a metal-made plate-like connection terminal 56 having conductivity is insert-molded in the first resin body 51 that is the inner side of the main body 50. The connection terminal 56 includes, for example, three connection terminals 56, and the outer end portion 56 a of the connection terminal 56 is exposed on the front side of the front end portion of the first resin body 51, and the external terminal is integrated with the outer end portion 56 a. 70 is provided.
The inner end portion 56 b of the connection terminal 56 is exposed on the front side of the intermediate portion of the first resin body 51, and the intermediate portion between the outer end portion 56 a and the inner end portion 56 b of the connection terminal 56 is embedded in the first resin body 51. (Insert) is fixed.

3つの接続端子56のうちの1つが電気的に接地される接地端子58とされており、接地端子58は、磁気検出部30の樹脂体34の外側で周囲を囲むように略コ字状に形成されて、第1の樹脂体51にインサート成形されている(図7参照)。
接地端子58には、磁気検出素子31の被固定部33及び電子部品35の被固定部33aを両側から挟んで位置決めする位置決め部58aが4箇所に一体に形成してある。
第1の樹脂体51にインサート成形された接続端子56には、外側端部56aと一体に外部端子70が設けられて、外部端子70にリード線71が電気的に接続されている、内側端部56bには、磁気検出素子31のリード端子32が電気的に接続される。
One of the three connection terminals 56 is a ground terminal 58 that is electrically grounded, and the ground terminal 58 is substantially U-shaped so as to surround the outside of the resin body 34 of the magnetic detection unit 30. After being formed, the first resin body 51 is insert-molded (see FIG. 7).
The ground terminal 58 is integrally formed with four positioning portions 58a for positioning the fixed portion 33 of the magnetic detection element 31 and the fixed portion 33a of the electronic component 35 from both sides.
The connection terminal 56 insert-molded in the first resin body 51 is provided with an external terminal 70 integrally with the outer end portion 56a, and the lead wire 71 is electrically connected to the external terminal 70. The lead terminal 32 of the magnetic detection element 31 is electrically connected to the part 56b.

接続端子56が内蔵された第1の樹脂体51には、磁気検出部30を接続端子56上に載置するようにセットし、接地端子58の位置決め部58aに樹脂体34,34aの4箇所の設置用の端子と兼用された被固定部33,33aを入れるようにして位置決めする。
この後、樹脂体34,34aの4箇所の設置用の端子と兼用された被固定部33,33aを接地端子58と電気的に接続して、位置決め状態を保持する。
さらに、接続端子56の外側端部56aと一体の外部端子70にリード線71を電気的に接続する。また、内側端部56bと磁気検出素子31のリード端子32を電気的に接続する。電気的な接続は、抵抗溶接や半田付けなどで行われる。
このように本体部50を構成する第1の樹脂体51にインサート成形された接続端子56の接地端子58に、樹脂体34の設置用の端子と兼用した被固定部33,33aをレーザ溶接や抵抗溶接で接続することで、略コ字状の接地端子58に4箇所設けられた位置決め部58aで樹脂体34が第1の樹脂体51に固定される。
これにより、金属板状の接地端子58に囲まれて磁気検出部30が内蔵された樹脂体34が第1の樹脂体51に強固に固定された状態となる。
In the first resin body 51 in which the connection terminal 56 is built, the magnetic detection unit 30 is set so as to be placed on the connection terminal 56, and the resin body 34, 34 a is positioned at the positioning portion 58 a of the ground terminal 58. The fixed portions 33 and 33a that are also used as the installation terminals are positioned so as to be inserted.
Thereafter, the fixed portions 33 and 33a which are also used as the four terminals for installation of the resin bodies 34 and 34a are electrically connected to the ground terminal 58, and the positioning state is maintained.
Further, the lead wire 71 is electrically connected to the external terminal 70 integrated with the outer end portion 56 a of the connection terminal 56. Further, the inner end portion 56b and the lead terminal 32 of the magnetic detection element 31 are electrically connected. The electrical connection is made by resistance welding or soldering.
In this way, to the ground terminal 58 of the connection terminal 56 insert-molded in the first resin body 51 constituting the main body 50, the fixed portions 33 and 33a that are also used as the terminals for installing the resin body 34 are laser-welded. By connecting by resistance welding, the resin body 34 is fixed to the first resin body 51 by positioning portions 58 a provided at four locations on the substantially U-shaped ground terminal 58.
Accordingly, the resin body 34 including the magnetic detection unit 30 surrounded by the metal plate-like ground terminal 58 is firmly fixed to the first resin body 51.

磁気検出部30が固定された第1の樹脂体51は、第2の樹脂体52によってインサート成形され本体部50が形成される。
第2の樹脂体52は、第1の樹脂体51と同一の樹脂材料、例えば、ガラス繊維入りポリアセターなどが用いられ、第1の樹脂体51の外側を覆っている。
これにより、第1の樹脂体51に取り付けた磁気検出部30が内蔵された樹脂体34は、気密的に封止される。また、第1の樹脂体51が第2の樹脂体52で覆われて一体に成形されることで、本体部50は強固な一体構造となり、内蔵された磁気検出部30を確実に固定することができ、熱による伸び縮みの影響を抑えることができ、リード端子32の断線など接続不良が防止される。
The first resin body 51 to which the magnetic detection unit 30 is fixed is insert-molded by the second resin body 52 to form the main body 50.
The second resin body 52 is made of the same resin material as the first resin body 51, for example, a glass fiber-containing polyaceter, and covers the outside of the first resin body 51.
Thereby, the resin body 34 including the magnetic detection unit 30 attached to the first resin body 51 is hermetically sealed. In addition, the first resin body 51 is covered with the second resin body 52 and integrally molded, so that the main body 50 has a strong integrated structure, and the built-in magnetic detection unit 30 is securely fixed. Thus, the influence of expansion and contraction due to heat can be suppressed, and connection failure such as disconnection of the lead terminal 32 can be prevented.

このような本体部50の外側の第2の樹脂体52を覆うように、カバー60が取り付けられる。カバー60は、ポリアセタールなどの樹脂材料からなり、横断面形状がハット状に形成され、円板状の表側の壁面部62に回動軸受部61が、既に説明したように、形成されている。回動軸受部61は、ホルダ20の回動軸部26を回動可能に支持している。
カバー60は、図2に示すように、環状の側壁部に開口部63が形成され、開口部63を介してフロートアーム41がアーム保持部27に取り付けられている。フロートアーム41の回動範囲に応じて開口部63の大きさを定めることで、開口部63をストッパとして機能させている。
カバー60のつば部分に対応して、本体部50を構成する第2の樹脂体52の表側に溶着用の突起部が複数設けられ、レーザ溶着などで本体部50に固定される。
これにより、ホルダ20の回動軸部26の回動を支持すると同時に、ホルダ20の脱落を防止する。
また、ホルダ20が回動する際、カバー60の回動軸受部61とホルダ20の端面20bが少ないクリアランスによって摺接することがあるが、端面20bが平坦面としてあるので、部分的な応力の集中を抑え、クラックの発生を防止している。
The cover 60 is attached so as to cover the second resin body 52 outside the main body 50. The cover 60 is made of a resin material such as polyacetal, has a cross-sectional shape formed in a hat shape, and the rotary bearing portion 61 is formed on the disk-shaped front wall surface portion 62 as described above. The rotation bearing portion 61 supports the rotation shaft portion 26 of the holder 20 so as to be rotatable.
As shown in FIG. 2, the cover 60 has an opening 63 formed in an annular side wall portion, and the float arm 41 is attached to the arm holding portion 27 via the opening 63. By defining the size of the opening 63 according to the rotation range of the float arm 41, the opening 63 is made to function as a stopper.
Corresponding to the flange portion of the cover 60, a plurality of welding projections are provided on the front side of the second resin body 52 constituting the main body 50, and are fixed to the main body 50 by laser welding or the like.
Accordingly, the rotation of the rotation shaft portion 26 of the holder 20 is supported, and at the same time, the holder 20 is prevented from falling off.
Further, when the holder 20 rotates, the rotation bearing portion 61 of the cover 60 and the end surface 20b of the holder 20 may be in sliding contact with a small clearance. However, since the end surface 20b is a flat surface, partial stress concentration is caused. Suppresses the occurrence of cracks.

このような液面検出装置100では、磁気検出部(検出部)30と外部とを電気的に接続する複数の外部端子(端子部材)70が、満液時の液面の高さよりも低い位置に設けられており(図1参照)、複数の外部端子70の周囲を囲む壁部81及び壁部81における満液時の液面側に位置する底部82を含み、底部82と反対側の端面83が開口する有底筒状をなす筒状部材80を備えている(図2参照)。
すなわち、有底筒状の筒状部材80は、底部82が本体部50の下端に一体に形成されて連結され、底部82に続く壁部81が複数の外部端子70の周囲を囲んで設けられており、壁部81の底部82と反対側の開放された端面83が液面側に開口し、筒状部材80の内部空間は、気密状態に形成されている。
In such a liquid level detection device 100, the plurality of external terminals (terminal members) 70 that electrically connect the magnetic detection unit (detection unit) 30 and the outside are positions lower than the height of the liquid level when the liquid is full. (See FIG. 1), and includes a wall portion 81 that surrounds the periphery of the plurality of external terminals 70 and a bottom portion 82 that is located on the liquid surface side of the wall portion 81 when the liquid is full, and is an end surface opposite to the bottom portion 82 A cylindrical member 80 having a bottomed cylindrical shape with an opening 83 is provided (see FIG. 2).
That is, the bottomed tubular member 80 has a bottom portion 82 formed integrally with the lower end of the main body portion 50 and connected thereto, and a wall portion 81 following the bottom portion 82 is provided to surround the plurality of external terminals 70. The open end surface 83 opposite to the bottom 82 of the wall portion 81 opens to the liquid surface side, and the internal space of the tubular member 80 is formed in an airtight state.

筒状部材80は、底部82から開口する端面83までの長さが液面の上昇によって外部端子70の周囲をエアポケットによる空気によって液体に触れないように覆うことができるように設定してある。
また、燃料タンクなどへの設置の際には、筒状部材80の開口する端面83は、液面と平行となるように配置され、例えば燃料タンクが水平面に対して傾けて設置される場合でも端面83は、水平な液面と平行に開口される。
また、燃料タンク自体を車両に対して水平に設置しても車両が坂道などで傾斜する場合もあるが、この場合でもエアポケットによる空気で外部端子70の周囲を覆うことができるように設定される。
これにより、複数の外部端子70の周囲を囲む筒状部材80は、液面が筒状部材80よりも高い位置にあって、端面83から液面が上昇しても内部空間に空気を保持してエアポケットを形成することで、外部端子70が液体中に浸漬されないようにし、外部端子70の間の電位差により、液体中に金属イオンが流出する電食を防止できるようにしている。
The cylindrical member 80 is set so that the length from the bottom 82 to the open end surface 83 can cover the periphery of the external terminal 70 so as not to touch the liquid by the air from the air pocket by the rise of the liquid level. .
In addition, when installing in a fuel tank or the like, the end face 83 where the cylindrical member 80 opens is arranged so as to be parallel to the liquid level, for example, even when the fuel tank is installed inclined with respect to a horizontal plane. The end surface 83 is opened in parallel with the horizontal liquid surface.
Further, even if the fuel tank itself is installed horizontally with respect to the vehicle, the vehicle may be inclined on a slope or the like, but even in this case, it is set so that the air around the external terminal 70 can be covered with air from the air pocket. The
Thereby, the cylindrical member 80 surrounding the plurality of external terminals 70 has a liquid level higher than that of the cylindrical member 80 and retains air in the internal space even when the liquid level rises from the end surface 83. By forming the air pockets, the external terminals 70 are prevented from being immersed in the liquid, and the electric corrosion between the metal ions flowing into the liquid due to the potential difference between the external terminals 70 can be prevented.

本実施形態の液面検出装置100では、筒状部材80は、円板状の底部82に、液面側に開口する円形の短筒状の底壁部82aが一体に形成され、底壁部82aの開口側の内側に円形の長筒状の壁部81を底部82に当てて連結して有底筒状に構成されている。底壁部82aと壁部81との間には、係止部84と被係止部85とが設けられ、外側の底壁部82aに係止凹部84aが形成され、内側の壁部81に係止凹部84aに係止されるフック状の係止凸部85aが形成してある。連結状態の筒状部材80の内部空間を気密状態に保持するため、壁部81の上部外周にOリング溝81aが形成され、シール部材としてOリング86が装着される。
このような筒状部材80を底壁部82aと壁部81との分割構造として係止凹部84aと係止凸部85aとで連結するとともに、Oリング86によって内部空間を気密状態とすることで、外部端子70の周囲にエアポケットを形成して空気を保持することができ、液体に浸漬されたり、液体に接触することを極力抑えて外部端子70の電食を防止することができる。
また、筒状部材80を底壁部82aと壁部81との分割構造としたので、外部端子70へのリード線71の接続などの作業を筒状部材80と干渉することなくて行うことができる。さらに、液面検出装置100の設置位置によって外部端子70が液面の高さより高い位置に設置される仕様では、壁部81を省略することで、簡単に対応することができる。
In the liquid level detection device 100 of the present embodiment, the cylindrical member 80 is formed by integrally forming a circular short bottom wall portion 82a that opens to the liquid level side on a disc-shaped bottom portion 82, and the bottom wall portion. A circular long cylindrical wall portion 81 is applied to and connected to the bottom 82 inside the opening side of 82a to form a bottomed cylindrical shape. A locking portion 84 and a locked portion 85 are provided between the bottom wall portion 82 a and the wall portion 81, a locking recess 84 a is formed in the outer bottom wall portion 82 a, and the inner wall portion 81 is formed. A hook-shaped locking projection 85a that is locked to the locking recess 84a is formed. In order to keep the internal space of the connected tubular member 80 in an airtight state, an O-ring groove 81a is formed on the upper outer periphery of the wall portion 81, and an O-ring 86 is mounted as a seal member.
By connecting such a cylindrical member 80 with a locking recess 84a and a locking projection 85a as a divided structure of the bottom wall portion 82a and the wall portion 81, the internal space is made airtight by the O-ring 86. The air pockets can be formed around the external terminals 70 to hold the air, and the electrolytic corrosion of the external terminals 70 can be prevented by minimizing the contact with the liquid or being immersed in the liquid.
Further, since the cylindrical member 80 has a divided structure of the bottom wall portion 82 a and the wall portion 81, operations such as connection of the lead wire 71 to the external terminal 70 can be performed without interfering with the cylindrical member 80. it can. Furthermore, in the specification in which the external terminal 70 is installed at a position higher than the height of the liquid level depending on the installation position of the liquid level detection device 100, it is possible to cope easily by omitting the wall portion 81.

なお、車両の振動などで、万一、液体が外部端子70にかかるようなことがあっても短時間であれば、外部端子70間での液体中への金属イオンの流出はほとんど起こらず、電食にはほとんど影響しない。
また、筒状部材80は、底部82と底壁部82aとを一体とし、壁部81を連結する分割構造とする場合に限らず、本体部50と筒状部材80とを一体に形成するようにしても良く、外部端子70の周囲を覆うように空気を保持してエアポケットを形成できれば良い。
また、筒状部材80は、円筒状とする場合に限らず、中空状であれば、横断面形状は、円形に限らず、楕円形、矩形や多角形状などであっても良い。
また、筒状部材80で周囲が囲まれる外部端子70は、金属部分を露出させることなく樹脂など被覆するようにすれば、一層確実に電食を防止することができる。
Even if the liquid may be applied to the external terminal 70 due to the vibration of the vehicle or the like, the outflow of metal ions into the liquid between the external terminals 70 hardly occurs if the time is short, It has little effect on electric corrosion.
In addition, the cylindrical member 80 is not limited to a case where the bottom portion 82 and the bottom wall portion 82a are integrated and the wall portion 81 is connected, but the main body portion 50 and the cylindrical member 80 are integrally formed. Alternatively, it is sufficient that the air pockets can be formed by holding air so as to cover the periphery of the external terminal 70.
In addition, the cylindrical member 80 is not limited to a cylindrical shape, and if it is hollow, the cross-sectional shape is not limited to a circle but may be an ellipse, a rectangle, a polygon, or the like.
Moreover, if the external terminal 70 surrounded by the cylindrical member 80 is covered with a resin or the like without exposing the metal portion, the electrolytic corrosion can be prevented more reliably.

以上のように構成した液面検出装置100によれば、複数の外部端子70の周囲を囲む筒状部材80によって液面が筒状部材80よりも高い位置にあっても、筒状部材80の端面83から液体が浸入して液面が上昇しても内部空間に空気を保持してエアポケットを形成することができ、外部端子70が液体中に浸漬されないように空気中に位置させることで、外部端子70の間の電位差により、液体中に金属イオンが流出する電食を防止することができる。
また、筒状部材80を液面側の端面83が開口するように設置するだけ良く、簡単な構造で外部端子70の電食を防止することができる。
また、外部端子70の電食を防止することで、外部端子70の抵抗が増大することも防止でき、液面を精度良く検出することができるとともに、液面検出装置100の耐久性を向上することができる。
According to the liquid level detection device 100 configured as described above, even if the liquid level is higher than the cylindrical member 80 by the cylindrical member 80 surrounding the plurality of external terminals 70, Even if liquid enters from the end face 83 and the liquid level rises, air can be held in the internal space to form an air pocket, and the external terminal 70 is positioned in the air so as not to be immersed in the liquid. Due to the potential difference between the external terminals 70, it is possible to prevent electrolytic corrosion from flowing out of metal ions into the liquid.
Moreover, it is only necessary to install the cylindrical member 80 so that the end surface 83 on the liquid surface side is open, and the electric corrosion of the external terminal 70 can be prevented with a simple structure.
Further, by preventing the electrolytic corrosion of the external terminal 70, it is possible to prevent the resistance of the external terminal 70 from increasing, to detect the liquid level with high accuracy, and to improve the durability of the liquid level detection device 100. be able to.

以上、実施の形態とともに具体的に説明したように、本発明の液面検出装置100は、液体の液面の高さの変化に伴い回転軸10aを中心に回動するホルダ(回動部材)20と、ホルダ(回動部材)20を回動可能に支持する本体部(支持部材)50と、本体部(支持部材)50に設けられ、ホルダ(回動部材)20の回動位置に応じた液面の高さの変化を電気的に検出する磁気検出部(検出部)30と、満液時の液面の高さよりも低い位置に設けられ、磁気検出部(検出部)30と外部とを電気的に接続する複数の外部端子(端子部材)70と、複数の外部端子(端子部材)の周囲を囲む壁部81及び壁部81における満液時の液面側に位置する底部82を含み、底部82と反対側の端面83が開口する有底筒状をなす筒状部材80と、を備えて構成されている。
かかる構成によれば、満液時の液面の高さよりも低い位置に設けられ、磁気検出部(検出部)30と外部とを電気的に接続する複数の外部端子(端子部材)70であっても、外部端子70の周囲を筒状部材80で囲んで、液面の上昇によりエアポケットを形成して外部端子70が液体中に浸漬されないように空気中に位置させることができる。これにより、筒状部材80を設けるだけの簡単な構造で、外部端子70の間の電位差によって液体中に金属イオンが流出する電食を防止することができる。
また、外部端子70の電食を防止することで、外部端子70が細くなって抵抗が増大することも防止でき、液面を精度良く検出することができ、液面検出装置100の耐久性を向上することもできる。
As described above in detail with the embodiment, the liquid level detection device 100 of the present invention is a holder (rotating member) that rotates around the rotation shaft 10a as the liquid level of the liquid changes. 20, a main body part (support member) 50 that rotatably supports the holder (rotating member) 20, and a main body part (supporting member) 50, depending on the rotational position of the holder (rotating member) 20. A magnetic detection unit (detection unit) 30 that electrically detects a change in the liquid level, and a magnetic detection unit (detection unit) 30 that is provided at a position lower than the height of the liquid level when the liquid is full. A plurality of external terminals (terminal members) 70 that are electrically connected to each other, a wall portion 81 that surrounds the periphery of the plurality of external terminals (terminal members), and a bottom portion 82 that is located on the liquid surface side when the wall portion 81 is full. A cylindrical member 80 having a bottomed cylindrical shape with an end face 83 opposite to the bottom 82 open. Ete is configured.
According to such a configuration, the plurality of external terminals (terminal members) 70 are provided at a position lower than the height of the liquid level when the liquid is full, and electrically connect the magnetic detection unit (detection unit) 30 and the outside. However, the periphery of the external terminal 70 can be surrounded by the cylindrical member 80, and an air pocket can be formed by rising the liquid level so that the external terminal 70 can be positioned in the air so as not to be immersed in the liquid. Thereby, with a simple structure in which only the cylindrical member 80 is provided, it is possible to prevent electrolytic corrosion in which metal ions flow out into the liquid due to a potential difference between the external terminals 70.
Further, by preventing the electrolytic corrosion of the external terminal 70, it is possible to prevent the external terminal 70 from being thinned and increase in resistance, to detect the liquid level with high accuracy, and to improve the durability of the liquid level detection device 100. It can also be improved.

本発明の液面検出装置100によれば、筒状部材80の開口側の端面83は、液面と平行に形成されているので、液面が上昇する際に確実にエアポケットを形成して外部端子70の周囲に空気を保持することができる。これにより、外部端子70が液体中に浸漬されないように空気中に位置させることができ、外部端子70の間の電位差により、液体中に金属イオンが流出する電食を防止することができる。   According to the liquid level detection device 100 of the present invention, the end face 83 on the opening side of the cylindrical member 80 is formed in parallel with the liquid level, so that an air pocket is reliably formed when the liquid level rises. Air can be held around the external terminal 70. Thereby, it is possible to position the external terminal 70 in the air so that the external terminal 70 is not immersed in the liquid, and due to a potential difference between the external terminals 70, it is possible to prevent electrolytic corrosion from flowing out metal ions into the liquid.

本発明の液面検出装置100によれば、筒状部材80は、本体部(支持部材)50と一体に形成されることで、簡単に筒状部材80を設けることができ、組み立て作業などを必要とせず外部端子70の電食を防止することができる。   According to the liquid level detection device 100 of the present invention, the cylindrical member 80 is formed integrally with the main body (supporting member) 50, so that the cylindrical member 80 can be easily provided, and assembly work and the like can be performed. The electric corrosion of the external terminal 70 can be prevented without being required.

本発明の液面検出装置100によれば、底部82は、壁部81における満液時の液面側の外周を囲む底壁部82aを備え、底壁部82aと壁部81の外周の間には、筒状部材80の内部空間への液体の浸入を抑制するOリング(シール部材)86が設けられる。これにより、外部端子70へのリード線71の接続などの作業を、底壁部82aと壁部81と分離することで、筒状部材80と干渉することなく行うことができる。また、液面検出装置100の設置位置によって外部端子70が液面より高い位置に設置される仕様では、壁部81を省略することで、簡単に対応することができる。   According to the liquid level detection device 100 of the present invention, the bottom portion 82 includes the bottom wall portion 82a that surrounds the outer periphery of the wall portion 81 on the liquid surface side when the liquid is full, and between the bottom wall portion 82a and the outer periphery of the wall portion 81. Is provided with an O-ring (seal member) 86 that suppresses liquid from entering the internal space of the tubular member 80. Thereby, operations such as connection of the lead wire 71 to the external terminal 70 can be performed without interfering with the cylindrical member 80 by separating the bottom wall portion 82a and the wall portion 81 from each other. In the specification in which the external terminal 70 is installed at a position higher than the liquid level depending on the installation position of the liquid level detection device 100, it is possible to easily cope with the problem by omitting the wall portion 81.

本発明の液面検出装置100によれば、底壁部82aと壁部81との外周の一方は、係止凹部(係止部)84aを備え、他方は、係止凸部(被係止部)85aを備えることで、底壁部82aと壁部81とを確実に連結して筒状部材80を構成することができ、Oリング(シール部材)86によって筒状部材80の内部空間を気密状態にすることができる。また、簡単構造で外部端子70の電食を防止して耐久性を向上することができ、液面の高さの検出精度を向上することができる。   According to the liquid level detection device 100 of the present invention, one of the outer peripheries of the bottom wall portion 82a and the wall portion 81 includes the locking recess (locking portion) 84a, and the other has the locking projection (locked). Portion) 85a, the bottom wall portion 82a and the wall portion 81 can be reliably connected to form the cylindrical member 80, and the O-ring (seal member) 86 provides an internal space for the cylindrical member 80. Can be airtight. In addition, it is possible to improve the durability by preventing the electrolytic corrosion of the external terminal 70 with a simple structure, and it is possible to improve the detection accuracy of the liquid level.

以上の説明は、本発明を例示するものであって、その要旨を逸脱しない範囲で種々の変更、変形が可能であることは言うまでもない。
例えば、磁気検出素子としてホールICで構成する場合を例に説明したが、これに限らず他の磁気検出素子であっても良い。また、磁気検出部30による場合に限らず、摺動抵抗式として構成されるものであっても良く、回路基板上に複数の電極を備え、電極上を接触しながら回動する接点部材により、回動位置によって変化する抵抗値から液面の高さを検出するようにしても良い。
また、液面の検出対象として燃料タンクを例に説明したが、これに限らず、他のタンクや貯槽などの液面の高さの検出に広く適用できるものである。
The above description exemplifies the present invention, and it goes without saying that various changes and modifications can be made without departing from the scope of the invention.
For example, the case where the magnetic detection element is configured by a Hall IC has been described as an example. However, the magnetic detection element is not limited to this and may be another magnetic detection element. In addition to the case of the magnetic detection unit 30, it may be configured as a sliding resistance type, and includes a plurality of electrodes on the circuit board, and a contact member that rotates while contacting the electrodes, You may make it detect the height of a liquid level from the resistance value which changes with rotation positions.
Further, the fuel tank has been described as an example of the liquid level detection target. However, the present invention is not limited to this, and the present invention can be widely applied to the detection of the liquid level of other tanks and storage tanks.

100 液面検出装置
10 磁石
10a 中心軸(回転軸)
11 端面
11a 表側の端面
11b 裏側の端面
12 側周面
13 保持用凹部
20 ホルダ(回動部材)
20a 円筒部(側面)
20b 表側の端面
20c 裏側の端面
21 第1の溝部
22 第2の溝部
25 回動軸受部
26 回動軸部
27 アーム保持部
30 磁気検出部(検出部)
31 磁気検出素子
32 リード端子
32a リード端子
32ag 接地リード端子
33 被固定部
33a 被固定部
34 樹脂体
34a 樹脂体
34b 樹脂体
35 電子部品
40 フロート
41 フロートアーム
50 本体部(支持部材)
51 第1の樹脂体
52 第2の樹脂体
53 回動軸部
54 固定用位置決め部
55 固定用フック
56 接続端子
56a 外側端部
56b 内側端部
58 接地端子
58a 位置決め部
60 カバー
61 回動軸受部
62 壁面部
63 開口部
70 外部端子(端子部材)
71 リード線
80 筒状部材
81 壁部
81a Oリング溝
82 底部
82a 底壁部
83 端面
84 係止部
84a 係止凹部
85 被係止部
85a 係止凸部
86 Oリング(シール部材)
DESCRIPTION OF SYMBOLS 100 Liquid level detection apparatus 10 Magnet 10a Center axis (rotary axis)
11 End surface 11a Front side end surface 11b Back side end surface 12 Side circumferential surface 13 Holding recess 20 Holder (rotating member)
20a Cylindrical part (side)
20b Front side end face 20c Back side end face 21 First groove part 22 Second groove part 25 Rotating bearing part 26 Rotating shaft part 27 Arm holding part 30 Magnetic detecting part (detecting part)
31 Magnetic detection element 32 Lead terminal 32a Lead terminal 32ag Ground lead terminal 33 Fixed portion 33a Fixed portion 34 Resin body 34a Resin body 34b Resin body 35 Electronic component 40 Float 41 Float arm 50 Main body (support member)
51 First resin body 52 Second resin body 53 Rotating shaft portion 54 Fixing positioning portion 55 Fixing hook 56 Connection terminal 56a Outer end portion 56b Inner end portion 58 Grounding terminal 58a Positioning portion 60 Cover 61 Rotating bearing portion 62 Wall portion 63 Opening portion 70 External terminal (terminal member)
71 Lead wire 80 Tubular member 81 Wall portion 81a O-ring groove 82 Bottom portion 82a Bottom wall portion 83 End surface 84 Locking portion 84a Locking recess 85 Locked portion 85a Locking protrusion 86 O-ring (seal member)

Claims (5)

液体の液面の高さの変化に伴い回転軸を中心に回動する回動部材と、
前記回動部材を回動可能に支持する支持部材と、
前記支持部材に設けられ、前記回動部材の回動位置に応じた前記液面の高さの変化を電気的に検出する検出部と、
満液時の前記液面よりも低い位置に設けられ、前記検出部と外部とを電気的に接続する複数の端子部材と、
前記複数の端子部材の周囲を囲む壁部及び前記壁部における満液時の前記液面側に位置する底部を含み、前記底部と反対側の端面が開口する有底筒状をなす筒状部材と、を備える、
ことを特徴とする液面検出装置。
A rotating member that rotates about a rotation axis as the liquid level of the liquid changes,
A support member that rotatably supports the rotating member;
A detection unit that is provided on the support member and electrically detects a change in height of the liquid surface according to a rotation position of the rotation member;
A plurality of terminal members that are provided at a position lower than the liquid level when full, and electrically connect the detection unit and the outside;
A cylindrical member having a bottomed cylindrical shape including a wall portion surrounding the periphery of the plurality of terminal members and a bottom portion located on the liquid surface side when the wall portion is full, and an end surface opposite to the bottom portion is open. And comprising
A liquid level detection device characterized by that.
前記筒状部材の開口側の端面は、前記液面と平行に形成されている、
ことを特徴とする請求項1に記載の液面検出装置。
The end surface on the opening side of the cylindrical member is formed in parallel with the liquid surface,
The liquid level detection device according to claim 1, wherein:
前記筒状部材は、前記支持部材と一体に形成されている、
ことを特徴とする請求項1または2に記載の液面検出装置。
The cylindrical member is formed integrally with the support member.
The liquid level detection device according to claim 1, wherein the liquid level detection device is a liquid level detection device.
前記底部は、前記壁部における満液時の前記液面側の外周を囲む底壁部を備え、
前記底壁部と前記壁部の外周の間には、前記筒状部材の内部空間への前記液体の浸入を抑制するシール部材が設けられる、
ことを特徴とする請求項1または2に記載の液面検出装置。
The bottom portion includes a bottom wall portion surrounding an outer periphery on the liquid level side when the wall portion is full of liquid,
Between the bottom wall portion and the outer periphery of the wall portion, a seal member that suppresses the intrusion of the liquid into the internal space of the cylindrical member is provided.
The liquid level detection device according to claim 1, wherein the liquid level detection device is a liquid level detection device.
前記底壁部と前記壁部との外周の一方は、係止部を備え、他方は、被係止部を備える、
ことを特徴とする請求項4に記載の液面検出装置。
One of the outer peripheries of the bottom wall portion and the wall portion includes a locking portion, and the other includes a locked portion.
The liquid level detection device according to claim 4, wherein:
JP2018033484A 2018-02-27 2018-02-27 Liquid level detection device Pending JP2019148502A (en)

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Country Link
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