WO2009125652A1 - Eddy-current instrument - Google Patents

Eddy-current instrument Download PDF

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Publication number
WO2009125652A1
WO2009125652A1 PCT/JP2009/055025 JP2009055025W WO2009125652A1 WO 2009125652 A1 WO2009125652 A1 WO 2009125652A1 JP 2009055025 W JP2009055025 W JP 2009055025W WO 2009125652 A1 WO2009125652 A1 WO 2009125652A1
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WO
WIPO (PCT)
Prior art keywords
case body
rotor
magnet
pointer
eddy current
Prior art date
Application number
PCT/JP2009/055025
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French (fr)
Japanese (ja)
Inventor
英樹 増田
樹 川村
俊幸 大竹
Original Assignee
日本精機株式会社
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Publication date
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Publication of WO2009125652A1 publication Critical patent/WO2009125652A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R7/00—Instruments capable of converting two or more currents or voltages into a single mechanical displacement
    • G01R7/12—Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming product
    • G01R7/14—Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming product moving-iron type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/04—Special adaptations of driving means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/07—Indicating devices, e.g. for remote indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2213/00—Indexing scheme relating to constructional details of indicators
    • G01D2213/10—Drivers for gauges

Definitions

  • the present invention relates to an eddy current instrument that rotates a rotor in accordance with the rotation of a magnet and drives a pointer by the rotation of the rotor.
  • a conventional eddy current type instrument includes a magnet, a rotor that is rotated by the action of eddy current generated by the rotation of the magnet, a pointer shaft that is attached to the center of the rotor, and a pointer that is attached to the pointer shaft. The measurement amount was instructed (see Patent Document 1). JP 58-32169 A
  • the present invention pays attention to the above-mentioned problems, and provides an eddy current type instrument capable of suppressing the occurrence of needle shake and preventing foreign matter from entering between the magnet and the rotor. Objective.
  • the present invention relates to an eddy current instrument comprising a magnet, a rotor that is rotated by the rotation of the magnet, a pointer shaft that is attached to the center of the rotor, and a pointer that is attached to the pointer shaft and indicates a measurement amount.
  • a main shaft on which the magnet is mounted a base plate that rotatably supports the main shaft, a first case body that rotatably supports a lower end portion of the pointer shaft, the rotor of the pointer shaft, and the pointer
  • a second case body rotatably supported between the base plate and the first case body, wherein the magnet is housed in the first case body and the second case body.
  • the rotor is housed.
  • the rotor has a substantially flat plate shape.
  • damper oil is disposed between the rotor and the first case body.
  • a bearing ball is disposed between the pointer shaft and the first case body.
  • a substantially flat yoke is disposed on the opposite side of the rotor from the opposing surface of the magnet while being housed in the first case body and the second case body. It is.
  • the second case body includes at least a pair of bosses for supporting the display body, the boss includes a hole portion for fixing the display body by a fixing unit, and the hole portion is not easily reached. It is formed in a bag shape.
  • an eddy current type instrument capable of achieving the intended purpose, suppressing the occurrence of needle shake, and preventing foreign matter from entering between the magnet and the rotor. Can do.
  • Sectional drawing of the eddy current type instrument of 1st Embodiment of this invention Sectional drawing of the eddy current type instrument of 2nd Embodiment of the invention.
  • the eddy current measuring instrument F mainly includes a magnet 1, a rotor 2, a pointer shaft 3, a pointer 4, a base plate 5, a main shaft 7, a first case body 8, and a second case body 9.
  • the magnet 1 is a permanent magnet, and the material thereof is, for example, a cast Fe—Al—Ni alloy.
  • the shape of the magnet 1 is flat and annular, and is attached to the upper end portion of the main shaft 7 via the bush 1a at the center, and rotates with the rotation of the main shaft 7.
  • the rotor 2 is rotated by the action of eddy current generated by the rotation of the magnet 1.
  • the rotor 2 is made of a metal such as copper or aluminum, and the shape thereof is a shape in which the central portion is slightly raised to the upper side in FIG. 1, but it falls on the outer periphery like a rotor of a conventional eddy current type instrument. It is not a cup type equipped with the shape, but a substantially flat disk shape.
  • the magnetic force of the magnet 1 acts on the disk-shaped plate surface of the rotor 2 that faces the plate surface of the magnet 1.
  • the pointer shaft 3 is made of metal and is mounted in a state of passing through the center of the rotor 2 via the bush 3a.
  • the pointer 4 is attached to the upper end of the pointer shaft 3 and indicates the measurement amount. In this embodiment, the vehicle speed is indicated.
  • the base plate 5 is made of metal and has a boss body 5a.
  • the base plate 5 includes a recess 5b.
  • a bearing portion 6 is fixed in the boss body 5a.
  • a main shaft 7 having a magnet 1 attached to the end portion thereof is pivotally supported by the bearing portion 6 so as to be rotatable.
  • a rotation cable extending from the vehicle is connected to the main shaft 7, and the rotation from the vehicle is transmitted to the main shaft 7.
  • the first case body 8 is made of a synthetic resin and includes a lower bearing portion 8a that rotatably supports the lower end portion of the pointer shaft 3 protruding to the back side of the rotor 2.
  • the first case body 8 includes a first recess 8b on the lower side and a second recess 8c on the upper side.
  • a metal bearing ball 11 is provided in the lower bearing portion 8 a of the first case body 8, and the bearing ball 11 is disposed between the pointer shaft 3 and the first case body 8. ing.
  • the second case body 9 is made of a synthetic resin and includes an upper bearing portion 9a that rotatably supports the rotor 2 and the pointer 4 of the pointer shaft 3.
  • the upper bearing portion 9a has a cylindrical shape and has a structure in which the pointer shaft 3 penetrates the inside thereof.
  • the pointer shaft 3 is rotatably supported by a lower bearing portion 8a and an upper bearing portion 9a.
  • the second case body 9 includes a recess 9b.
  • 9c is a boss for fixing the dial plate 20 (refer FIG. 2) provided with the index
  • the eddy current type instrument F of this embodiment stores the magnet 1 in the first storage portion 12 constituted by the recess 5b of the base plate 5 and the first recess 8b of the first case body 8.
  • the rotor 2 is housed in the second housing portion 13 constituted by the second recess 8 c of the first case body 8 and the recess 9 b of the second case body 9.
  • a damper oil made of silicon oil is contained in the second storage portion 13, and in particular, a damper oil 10 is provided between the rotor 2 and the first case body 8.
  • 14 is a yoke and 15 is a spring.
  • the yoke 14 is made of a ferromagnetic material such as iron or permalloy, has a flat plate shape, and has an annular shape.
  • the yoke 14 is fixed by being sandwiched between the first case body 8 and the second case body 9.
  • the yoke 14 is housed in a second housing portion 13 composed of the first case body 8 and the second case body 9. And it is provided in the opposite side to the opposing surface of the magnet 1 of the rotor 2.
  • the magnetic field of the magnet 1 forms a closed loop of the magnet 1, the rotor 2, the yoke 14, the rotor 2, and the magnet 1 again, thereby improving the magnetic efficiency and the rotational torque generated in the rotor 2. Can be increased.
  • the yoke 14 has a flat plate shape, it can be stored in the second storage portion 13.
  • the spring 15 is made of metal and applies a force for rotating the pointer shaft 3 in a predetermined direction.
  • the spring 15 has one end fixed to the bush 3 a and the other end fixed to the second case body 9.
  • the spring 15 is also housed in the second housing portion 13, as with the yoke 14.
  • the first case body 8 that rotatably supports the lower end portion of the pointer shaft 3, and the second case body 9 that rotatably supports between the rotor 2 and the pointer 4 of the pointer shaft 3,
  • the magnet 1 is accommodated by the base plate 5 and the first case body 8
  • the rotor 2 is accommodated by the first case body 8 and the second case body 9, whereby the main shaft 7 and the pointer shaft 3 Since the pointer shaft 3 does not come into contact with the main shaft 7 that rotates at high speed, the pointer shaft 3 is not affected by vibration or friction of the main shaft 7.
  • the pointer shaft 3 can be rotatably supported by the first case body 8 made of synthetic resin, and can be manufactured at low cost.
  • the rotor 2 has a substantially flat plate shape, there is no need for drawing processing as in the case of a conventional cup-type rotor, the processing of the rotor 2 is facilitated, and the unbalance amount of the rotor 2 is reduced. This makes it difficult to cause needle shake.
  • a pair of bosses 9c are provided on both sides of the upper bearing portion 9a of the second case body 9 so as to sandwich the upper bearing portion 9a.
  • the boss 9c supports the dial plate 20 as a display body.
  • the dial plate 20 is formed with an index portion (not shown) made of scales and characters.
  • the dial plate 20 is fixed to the boss 9c by screws 21 as fixing means.
  • the boss 9c is provided with a hole portion 9d into which the screw 21 is inserted, and the hole portion 9d is formed in a bag-like shape. Since the hole 9d has a bag shape, the hole 9d does not reach the second storage portion 13 formed by the first case body 8 and the second case body 9.
  • the display body is the dial plate 20, but the display body is not limited to the present embodiment, and may be a light guide body made of a synthetic resin capable of transmitting light.
  • the present invention can be applied to an eddy current instrument that rotates a rotor in accordance with the rotation of a magnet and drives a pointer by the rotation of the rotor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Measuring Devices (AREA)
  • Instrument Panels (AREA)

Abstract

Provided is an eddy-current instrument capable of suppressing pointer deflection and preventing a foreign substance from entering a space between a magnet and a rotor. An eddy-current instrument (F) equipped with a magnet (1), a rotor (2) rotated by an eddy-current action generated by the rotation of the magnet (1), a pointer shaft (3) attached to the rotor (2), and a pointer (4) attached to the pointer shaft (3) and pointing to a measured value is provided with a main shaft (7) to which the magnet (1) is attached, a base plate (5) which rotatably supports the main shaft (7), a first case body (8) which rotatably supports the lower end of the pointer shaft (3), and a second case body (9) which rotatably supports a portion between the rotor (2) and the pointer (4) of the pointer shaft (3). The base plate (5) and the first case body (8) house the magnet (1), and the first case body (8) and the second case body (9) house the rotor (2).

Description

渦電流式計器Eddy current instrument
　本発明は、磁石の回転に応じてロータを回転させ、このロータの回転によって指針を駆動する渦電流式計器に関する。  The present invention relates to an eddy current instrument that rotates a rotor in accordance with the rotation of a magnet and drives a pointer by the rotation of the rotor.
　従来の渦電流式計器は、磁石と、この磁石の回転により発生する渦電流作用により回動するロータと、ロータの中央に装着される指針軸と、指針軸に装着された指針とを備え、計測量を指示するものであった（特許文献１参照）。
特開昭５８－３２１６９号公報 A conventional eddy current type instrument includes a magnet, a rotor that is rotated by the action of eddy current generated by the rotation of the magnet, a pointer shaft that is attached to the center of the rotor, and a pointer that is attached to the pointer shaft. The measurement amount was instructed (see Patent Document 1).
JP 58-32169 A
　しかしながら、従来の渦電流式計器は、回動可能に軸支される主軸の上端部に指針軸の軸受が形成されているため、摩擦による回転トルクによって針が振れる（回転する）、針振れという現象が発生し易いといった問題点を有していた。 However, in the conventional eddy current type instrument, since the bearing of the pointer shaft is formed at the upper end portion of the main shaft that is pivotally supported, the needle shakes (rotates) due to the rotational torque caused by friction. There was a problem that the phenomenon was likely to occur.
　また、従来の渦電流式計器は、前記磁石と前記ロータとが露出しているために、前記磁石と前記ロータとの間に異物が侵入して計器の作動を阻害する虞があるという問題点があった。 Further, in the conventional eddy current type instrument, since the magnet and the rotor are exposed, there is a possibility that foreign matter may enter between the magnet and the rotor to hinder the operation of the instrument. was there.
　そこで、本発明は前述した問題点に着目し、針振れの発生を抑制するとともに、磁石とロータとの間に異物が侵入することを防止することが可能な渦電流式計器を提供することを目的とする。 Accordingly, the present invention pays attention to the above-mentioned problems, and provides an eddy current type instrument capable of suppressing the occurrence of needle shake and preventing foreign matter from entering between the magnet and the rotor. Objective.
　本発明は、磁石と、前記磁石の回転により回動するロータと、前記ロータの中央に装着される指針軸と、前記指針軸に装着され計測量を指示する指針と、を備える渦電流式計器において、前記磁石を装着した主軸と、前記主軸を回動可能に支持するベースプレートと、前記指針軸の下端部を回転可能に支持する第１のケース体と、前記指針軸の前記ロータと前記指針との間を回転可能に支持する第２のケース体と、を備え、前記ベースプレートと前記第１のケース体とで前記磁石を収納し、前記第１のケース体と前記第２のケース体とで前記ロータを収納したものである。 The present invention relates to an eddy current instrument comprising a magnet, a rotor that is rotated by the rotation of the magnet, a pointer shaft that is attached to the center of the rotor, and a pointer that is attached to the pointer shaft and indicates a measurement amount. A main shaft on which the magnet is mounted, a base plate that rotatably supports the main shaft, a first case body that rotatably supports a lower end portion of the pointer shaft, the rotor of the pointer shaft, and the pointer A second case body rotatably supported between the base plate and the first case body, wherein the magnet is housed in the first case body and the second case body. In which the rotor is housed.
　また、本発明は、前記ロータを、ほぼ平板形状としたものである。  Further, in the present invention, the rotor has a substantially flat plate shape.
　また、本発明は、前記ロータと前記第１のケース体との間にダンパーオイルを配設したものである。  In the present invention, damper oil is disposed between the rotor and the first case body.
　また、本発明は、前記指針軸と前記第１のケース体との間に軸受ボールを配設したものである。  Further, in the present invention, a bearing ball is disposed between the pointer shaft and the first case body.
　また、本発明は、前記第１のケース体と前記第２のケース体とで収納されるとともに前記ロータの前記磁石の対向面とは反対の側に、ほぼ平板形状のヨークを配設したものである。 In the present invention, a substantially flat yoke is disposed on the opposite side of the rotor from the opposing surface of the magnet while being housed in the first case body and the second case body. It is.
　また、本発明は、前記第２のケース体に表示体を支持する少なくとも一対のボスを備え、前記ボスに前記表示体を固定手段によって固定するための穴部を備え、前記穴部を行きづまった袋状に形成したものである。 In the present invention, the second case body includes at least a pair of bosses for supporting the display body, the boss includes a hole portion for fixing the display body by a fixing unit, and the hole portion is not easily reached. It is formed in a bag shape.
　本発明によれば、所期の目的を達成でき、針振れの発生を抑制するとともに、磁石とロータとの間に異物が侵入することを防止することが可能な渦電流式計器を提供することができる。 According to the present invention, it is possible to provide an eddy current type instrument capable of achieving the intended purpose, suppressing the occurrence of needle shake, and preventing foreign matter from entering between the magnet and the rotor. Can do.
本発明の第１実施形態の渦電流式計器の断面図。Sectional drawing of the eddy current type instrument of 1st Embodiment of this invention. 同発明の第２実施形態の渦電流式計器の断面図。Sectional drawing of the eddy current type instrument of 2nd Embodiment of the invention.
符号の説明Explanation of symbols
　　Ｆ　　　渦電流式計器
　　１　　　磁石
　　１ａ　　ブッシュ 
　　２　　　ロータ 
　　３　　　指針軸 
　　３ａ　　ブッシュ 
　　４　　　指針 
　　５　　　ベースプレート 
　　５ａ　　ボス体 
　　５ｂ　　凹部 
　　６　　　軸受け部 
　　７　　　主軸 
　　８　　　第１のケース体 
　　８ａ　　下軸受け部 
　　８ｂ　　第１凹部 
　　８ｃ　　第２凹部 
　　９　　　第２のケース体 
　　９ａ　　上軸受け部 
　　９ｂ　　凹部 
　　９ｃ　　ボス 
　　９ｄ　　穴部 
　１０　　　ダンパーオイル 
　１１　　　軸受ボール 
　１２　　　第１の収納部 
　１３　　　第２の収納部 
　１４　　　ヨーク 
　１５　　　ばね 
　２０　　　表示体（文字板） 
　１　　　固定手段（ビス）  F Eddy current meter 1 Magnet 1a Bush
2 Rotor
3 Pointer shaft
3a bush
4 Guidelines
5 Base plate
5a Boss body
5b recess
6 Bearing part
7 Spindle
8 First case body
8a Lower bearing part
8b First recess
8c Second recess
9 Second case body
9a Upper bearing
9b recess
9c boss
9d hole
10 Damper oil
11 Bearing ball
12 First storage section
13 Second storage section
14 York
15 Spring
20 Display (Dial)
1 Fixing means (screw)
　以下、本発明を適用した第１実施形態を添付図面に基づいて説明する。  Hereinafter, a first embodiment to which the present invention is applied will be described with reference to the accompanying drawings.
　渦電流式計器Ｆは、主に、磁石１、ロータ２、指針軸３、指針４、ベースプレート５、主軸７、第１のケース体８および第２のケース体９で構成されている。 The eddy current measuring instrument F mainly includes a magnet 1, a rotor 2, a pointer shaft 3, a pointer 4, a base plate 5, a main shaft 7, a first case body 8, and a second case body 9.
　磁石１は、永久磁石であり、その材質は、例えば、鋳造Ｆｅ－Ａｌ－Ｎｉ合金などからなる。磁石１の形状は、平板状で、かつ環状であり、その中央に、ブッシュ１ａを介して主軸７の上端部に装着され、主軸７の回転に伴って回動するものである。 The magnet 1 is a permanent magnet, and the material thereof is, for example, a cast Fe—Al—Ni alloy. The shape of the magnet 1 is flat and annular, and is attached to the upper end portion of the main shaft 7 via the bush 1a at the center, and rotates with the rotation of the main shaft 7.
　ロータ２は、磁石１の回転により発生する渦電流作用により回動するものである。ロータ２は、銅やアルミなどの金属からなり、その形状は、中央部が図１中上側に若干隆起した形状ではあるが、従来の渦電流式計器のロータのように、外周に立ち下がり壁を備えたカップ型ではなく、ほぼ平板の円盤形状である。磁石１の磁力は、磁石１の板面と対向するロータ２の円盤状の板面に作用する。 The rotor 2 is rotated by the action of eddy current generated by the rotation of the magnet 1. The rotor 2 is made of a metal such as copper or aluminum, and the shape thereof is a shape in which the central portion is slightly raised to the upper side in FIG. 1, but it falls on the outer periphery like a rotor of a conventional eddy current type instrument. It is not a cup type equipped with the shape, but a substantially flat disk shape. The magnetic force of the magnet 1 acts on the disk-shaped plate surface of the rotor 2 that faces the plate surface of the magnet 1.
　指針軸３は、金属からなり、ブッシュ３ａを介してロータ２の中央を貫通した状態で装着される。  The pointer shaft 3 is made of metal and is mounted in a state of passing through the center of the rotor 2 via the bush 3a.
　指針４は、指針軸３の上端部に装着され計測量を指示するものである。本実施形態では、車両の速度を指示するものである。  The pointer 4 is attached to the upper end of the pointer shaft 3 and indicates the measurement amount. In this embodiment, the vehicle speed is indicated.
　ベースプレート５は、金属からなり、ボス体５ａを備えている。また、ベースプレート５は、凹部５ｂを備えている。ボス体５ａ内には、軸受け部６が固定されている。この軸受け部６に、端部に磁石１を装着した主軸７が、回動可能に軸支されている。主軸７には、車両から伸びる回転ケーブルが接続されて、前記車両からの回転を主軸７に伝達するものである。 The base plate 5 is made of metal and has a boss body 5a. The base plate 5 includes a recess 5b. A bearing portion 6 is fixed in the boss body 5a. A main shaft 7 having a magnet 1 attached to the end portion thereof is pivotally supported by the bearing portion 6 so as to be rotatable. A rotation cable extending from the vehicle is connected to the main shaft 7, and the rotation from the vehicle is transmitted to the main shaft 7.
　第１のケース体８は、合成樹脂からなり、ロータ２の裏面側に突出した指針軸３の下端部を回転可能に支持する下軸受け部８ａを備えている。また、第１のケース体８は、下側に第１凹部８ｂを、上側に第２凹部８ｃを備えている。 The first case body 8 is made of a synthetic resin and includes a lower bearing portion 8a that rotatably supports the lower end portion of the pointer shaft 3 protruding to the back side of the rotor 2. The first case body 8 includes a first recess 8b on the lower side and a second recess 8c on the upper side.
　また、第１のケース体８の下軸受け部８ａ内には、金属製の軸受ボール１１が設けられており、指針軸３と第１のケース体８との間に軸受ボール１１が配設されている。 A metal bearing ball 11 is provided in the lower bearing portion 8 a of the first case body 8, and the bearing ball 11 is disposed between the pointer shaft 3 and the first case body 8. ing.
　第２のケース体９は、合成樹脂からなり、指針軸３のロータ２と指針４との間を回転可能に支持する上軸受け部９ａを備えている。この上軸受け部９ａは、筒状であり、その内側を指針軸３が貫通する構造である。指針軸３は下軸受け部８ａと上軸受け部９ａとで回転可能に支持されている。また、第２のケース体９は、凹部９ｂを備えている。なお、９ｃは、指針４が指示する指標部を備えた文字板２０（図２参照）を固定するためのボスである。 The second case body 9 is made of a synthetic resin and includes an upper bearing portion 9a that rotatably supports the rotor 2 and the pointer 4 of the pointer shaft 3. The upper bearing portion 9a has a cylindrical shape and has a structure in which the pointer shaft 3 penetrates the inside thereof. The pointer shaft 3 is rotatably supported by a lower bearing portion 8a and an upper bearing portion 9a. The second case body 9 includes a recess 9b. In addition, 9c is a boss for fixing the dial plate 20 (refer FIG. 2) provided with the index | index part which the pointer | guide 4 instruct | indicates.
　本実施形態の渦電流式計器Ｆは、ベースプレート５の凹部５ｂと第１のケース体８の第１凹部８ｂとで構成される第１の収納部１２内に磁石１を収納する。 The eddy current type instrument F of this embodiment stores the magnet 1 in the first storage portion 12 constituted by the recess 5b of the base plate 5 and the first recess 8b of the first case body 8.
　また、第１のケース体８の第２凹部８ｃと第２のケース体９の凹部９ｂとで構成される第２の収納部１３内にロータ２を収納する。 Further, the rotor 2 is housed in the second housing portion 13 constituted by the second recess 8 c of the first case body 8 and the recess 9 b of the second case body 9.
　また、第２の収納部１３内には、シリコンオイルからなるダンパーオイルが入っており、特に、ロータ２と第１ケース体８との間にダンパーオイル１０が設けられている。 Further, a damper oil made of silicon oil is contained in the second storage portion 13, and in particular, a damper oil 10 is provided between the rotor 2 and the first case body 8.
　なお、１４は、ヨークであり、１５は、ばねである。  In addition, 14 is a yoke and 15 is a spring.
　ヨーク１４は、鉄やパーマロイなどの強磁性体からなり、平板形状で、かつ環状である。このヨーク１４は、第１のケース体８と第２のケース体９とで挟まれて固定される。そして、ヨーク１４は、第１のケース体８と第２のケース体９とで構成される第２の収納部１３内に収納されている。そして、ロータ２の磁石１の対向面とは反対の側に設けられている。このヨーク１４を設けたことによって、磁石１の磁界は、磁石１、ロータ２、ヨーク１４、再びロータ２、そして磁石１という閉ループを構成し、磁気効率を向上させてロータ２に発生する回転トルクを大きくすることができる。また、ヨーク１４を平板形状としたことによって、第２の収納部１３内に収納することができる。 The yoke 14 is made of a ferromagnetic material such as iron or permalloy, has a flat plate shape, and has an annular shape. The yoke 14 is fixed by being sandwiched between the first case body 8 and the second case body 9. The yoke 14 is housed in a second housing portion 13 composed of the first case body 8 and the second case body 9. And it is provided in the opposite side to the opposing surface of the magnet 1 of the rotor 2. As shown in FIG. By providing the yoke 14, the magnetic field of the magnet 1 forms a closed loop of the magnet 1, the rotor 2, the yoke 14, the rotor 2, and the magnet 1 again, thereby improving the magnetic efficiency and the rotational torque generated in the rotor 2. Can be increased. Further, since the yoke 14 has a flat plate shape, it can be stored in the second storage portion 13.
　ばね１５は、金属製で、指針軸３を所定の方向に回転する力を加えるものである。ばね１５は、一端がブッシュ３ａに固定され、他端が第２のケース体９に固定されている。また、ばね１５も、ヨーク１４と同様に、第２の収納部１３内に収納されている。 The spring 15 is made of metal and applies a force for rotating the pointer shaft 3 in a predetermined direction. The spring 15 has one end fixed to the bush 3 a and the other end fixed to the second case body 9. The spring 15 is also housed in the second housing portion 13, as with the yoke 14.
　以上の構成によって、指針軸３の下端部を回転可能に支持する第１のケース体８と、指針軸３のロータ２と指針４との間を回転可能に支持する第２のケース体９と、を備え、ベースプレート５と第１のケース体８とで磁石１を収納し、第１のケース体８と第２のケース体９とでロータ２を収納したことによって、主軸７と指針軸３を分離することができ、指針軸３は高速で回転する主軸７と接触しないため、指針軸３は、主軸７の振動や摩擦の影響を受けることがなくなる。 With the above configuration, the first case body 8 that rotatably supports the lower end portion of the pointer shaft 3, and the second case body 9 that rotatably supports between the rotor 2 and the pointer 4 of the pointer shaft 3, , The magnet 1 is accommodated by the base plate 5 and the first case body 8, and the rotor 2 is accommodated by the first case body 8 and the second case body 9, whereby the main shaft 7 and the pointer shaft 3 Since the pointer shaft 3 does not come into contact with the main shaft 7 that rotates at high speed, the pointer shaft 3 is not affected by vibration or friction of the main shaft 7.
　また、指針軸３を合成樹脂からなる第１のケース体８で回転可能に支持することができ、安価に製造することができる。  Also, the pointer shaft 3 can be rotatably supported by the first case body 8 made of synthetic resin, and can be manufactured at low cost.
　また、磁石１とロータ２とを収納したことによって、磁石１とロータ２との間に異物が侵入することを防止することができる。  Further, by accommodating the magnet 1 and the rotor 2, it is possible to prevent foreign matter from entering between the magnet 1 and the rotor 2.
　また、ロータ２を、ほぼ平板形状としたことによって、従来のカップ型のロータのように、絞り加工の必要がなくなり、ロータ２の加工が容易になるとともに、ロータ２のアンバランス量を低減することで針振れを起こし難くすることができる。 Further, since the rotor 2 has a substantially flat plate shape, there is no need for drawing processing as in the case of a conventional cup-type rotor, the processing of the rotor 2 is facilitated, and the unbalance amount of the rotor 2 is reduced. This makes it difficult to cause needle shake.
　また、ロータ２を収納し、ロータ２と第１のケース体８との間にダンパーオイル１０を配設したことによって、ロータ１と第１のケース体８との間でダンピング抵抗を得ることが可能となり、従来の渦電流式計器のように、ダンパーオイルを保持するためのオイルカップを不要とすることで、構造を簡素化することができ、安価な渦電流式計器を提供することができる。 Further, by accommodating the rotor 2 and disposing the damper oil 10 between the rotor 2 and the first case body 8, a damping resistance can be obtained between the rotor 1 and the first case body 8. This eliminates the need for an oil cup for holding damper oil as in the conventional eddy current type instrument, thereby simplifying the structure and providing an inexpensive eddy current type instrument. .
　また、指針軸３と第１のケース体８との間に軸受ボール１１を配設したことによって、指針軸３と第１のケース体８との摩擦を低減することができ、コストを抑えて針振れを起こし難い構造を得ることができる。 Further, by providing the bearing ball 11 between the pointer shaft 3 and the first case body 8, friction between the pointer shaft 3 and the first case body 8 can be reduced, and the cost can be reduced. It is possible to obtain a structure that hardly causes needle wobbling.
　次に本発明の第２実施形態を図２を用いて説明する。なお、第１実施形態と同一および相当個所には同一符号を付してその詳細な説明は省略する。 Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same and equivalent part as 1st Embodiment, and the detailed description is abbreviate | omitted.
　第２のケース体９の上軸受け部９ａの両側には、上軸受け部９ａを挟むように一対のボス９ｃが設けられている。このボス９ｃは、表示体である文字板２０を支持するものである。この文字板２０は、目盛や文字などからなる図示しない指標部が形成されている。文字板２０は、固定手段であるビス２１によってボス９ｃに固定されている。ボス９ｃには、ビス２１が挿入される穴部９ｄを備えており、この穴部９ｄは、行きづまった袋状に形成されている。穴部９ｄが、袋状であるため、第１のケース体８と第二のケース体９とで形成される第２の収納部１３に達しないものである。 A pair of bosses 9c are provided on both sides of the upper bearing portion 9a of the second case body 9 so as to sandwich the upper bearing portion 9a. The boss 9c supports the dial plate 20 as a display body. The dial plate 20 is formed with an index portion (not shown) made of scales and characters. The dial plate 20 is fixed to the boss 9c by screws 21 as fixing means. The boss 9c is provided with a hole portion 9d into which the screw 21 is inserted, and the hole portion 9d is formed in a bag-like shape. Since the hole 9d has a bag shape, the hole 9d does not reach the second storage portion 13 formed by the first case body 8 and the second case body 9.
　以上のように構成したことによって、ビス２１で文字板２０をボス９ｃに固定するために、ビス２１を穴部９ｄにねじ込む時に発生することがある削り屑などの異物が第２の収納部１３内に侵入することを防止することができる。 With the above configuration, foreign matter such as shavings that may be generated when the screw 21 is screwed into the hole 9d in order to fix the dial plate 20 to the boss 9c with the screw 21, is stored in the second storage portion 13. Intrusion can be prevented.
　なお、本実施形態では、表示体が文字板２０であったが、本実施形態に限定されるものではなく、光を透過可能な合成樹脂からなる導光体であってもよい。 In the present embodiment, the display body is the dial plate 20, but the display body is not limited to the present embodiment, and may be a light guide body made of a synthetic resin capable of transmitting light.
本発明は、磁石の回転に応じてロータを回転させ、このロータの回転によって指針を駆動する渦電流式計器への利用が可能である。 The present invention can be applied to an eddy current instrument that rotates a rotor in accordance with the rotation of a magnet and drives a pointer by the rotation of the rotor.

Claims (6)

  1. 磁石と、前記磁石の回転により回動するロータと、前記ロータの中央に装着される指針軸と、前記指針軸に装着され計測量を指示する指針と、を備える渦電流式計器において、前記磁石を装着した主軸と、前記主軸を回動可能に支持するベースプレートと、前記指針軸の下端部を回転可能に支持する第１のケース体と、前記指針軸の前記ロータと前記指針との間を回転可能に支持する第２のケース体と、を備え、前記ベースプレートと前記第１のケース体とで前記磁石を収納し、前記第１のケース体と前記第２のケース体とで前記ロータを収納したことを特徴とする渦電流式計器。 In the eddy current type instrument comprising: a magnet; a rotor that is rotated by rotation of the magnet; a pointer shaft that is attached to the center of the rotor; and a pointer that is attached to the pointer shaft and indicates a measurement amount. A base plate that rotatably supports the main shaft, a first case body that rotatably supports a lower end portion of the pointer shaft, and a space between the rotor and the pointer of the pointer shaft. A second case body rotatably supported, wherein the magnet is accommodated by the base plate and the first case body, and the rotor is constituted by the first case body and the second case body. An eddy current instrument characterized by being housed.
  2. 前記ロータを、ほぼ平板形状としたことを特徴とする請求項１に記載の渦電流式計器。  2. The eddy current instrument according to claim 1, wherein the rotor has a substantially flat plate shape.
  3. 前記ロータと前記第１のケース体との間にダンパーオイルを配設したことを特徴とする請求項１に記載の渦電流式計器。 2. The eddy current instrument according to claim 1, wherein damper oil is disposed between the rotor and the first case body.
  4. 前記指針軸と前記第１のケース体との間に軸受ボールを配設したことを特徴とする請求項１に記載の渦電流式計器。  The eddy current type instrument according to claim 1, wherein a bearing ball is disposed between the pointer shaft and the first case body.
  5. 前記第１のケース体と前記第２のケース体とで収納されるとともに前記ロータの前記磁石の対向面とは反対の側に、ほぼ平板形状のヨークを配設したことを特徴とする請求項２に記載の渦電流式計器。 The substantially flat yoke is disposed on the opposite side of the rotor from the opposing surface of the magnet while being accommodated by the first case body and the second case body. 2. The eddy current meter according to 2.
  6. 前記第２のケース体に表示体を支持する少なくとも一対のボスを備え、前記ボスに前記表示体を固定手段によって固定するための穴部を備え、前記穴部を行きづまった袋状に形成したことを特徴とする請求項１に記載の渦電流式計器。 The second case body includes at least a pair of bosses for supporting the display body, the boss includes a hole portion for fixing the display body by a fixing means, and the hole portion is formed in a bag shape. The eddy current type instrument according to claim 1.
PCT/JP2009/055025 2008-04-11 2009-03-16 Eddy-current instrument WO2009125652A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008102985 2008-04-11
JP2008-102985 2008-04-11
JP2008174035A JP2009271047A (en) 2008-04-11 2008-07-03 Eddy-current instrument
JP2008-174035 2008-07-03

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WO2009125652A1 true WO2009125652A1 (en) 2009-10-15

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4873677U (en) * 1971-12-20 1973-09-13
JPS5023859A (en) * 1973-07-02 1975-03-14
JPS5834054U (en) * 1981-08-31 1983-03-05 日本精機株式会社 eddy current instrument
JPH06129878A (en) * 1992-10-21 1994-05-13 Yazaki Corp Movement for instrument
JP2002323350A (en) * 2001-04-27 2002-11-08 Yazaki Corp Pointer type display device
JP2003161650A (en) * 2001-11-28 2003-06-06 Nippon Seiki Co Ltd Indicator instrument device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4873677U (en) * 1971-12-20 1973-09-13
JPS5023859A (en) * 1973-07-02 1975-03-14
JPS5834054U (en) * 1981-08-31 1983-03-05 日本精機株式会社 eddy current instrument
JPH06129878A (en) * 1992-10-21 1994-05-13 Yazaki Corp Movement for instrument
JP2002323350A (en) * 2001-04-27 2002-11-08 Yazaki Corp Pointer type display device
JP2003161650A (en) * 2001-11-28 2003-06-06 Nippon Seiki Co Ltd Indicator instrument device

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