WO2010038603A1 - Eddy-current meter - Google Patents
Eddy-current meter Download PDFInfo
- Publication number
- WO2010038603A1 WO2010038603A1 PCT/JP2009/065987 JP2009065987W WO2010038603A1 WO 2010038603 A1 WO2010038603 A1 WO 2010038603A1 JP 2009065987 W JP2009065987 W JP 2009065987W WO 2010038603 A1 WO2010038603 A1 WO 2010038603A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- case body
- magnet
- pointer
- pointer shaft
- Prior art date
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- 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
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- 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
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
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- 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
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).
- the present invention pays attention to the above-mentioned problems, and an object thereof is to provide an eddy current type instrument capable of assembling a rotor and a pointer shaft at low cost.
- the present invention includes a magnet, a main shaft on which the magnet is mounted, a base plate that rotatably supports the main shaft, a rotor that is rotated by the rotation of the magnet, and an opposite surface of the rotor facing the magnet.
- Yoke provided on the side, a spiral spring that regulates the amount of rotation caused by eddy currents generated in the rotor, a pointer shaft attached to the center of the rotor, and a measurement amount attached to the pointer shaft
- a pointer a first case body that rotatably supports a lower end portion of the pointer shaft, and a second case body that rotatably supports between the rotor of the pointer shaft and the pointer,
- the rotor, the pointer shaft Made of resin And one end of the spiral spring is fixed to the bush, and the other end of the spiral spring is fixed to at
- one end of the spiral spring is fixed to the bush by heat caulking.
- one end of the spiral spring is fixed to the bush by UV bonding.
- Sectional drawing of the eddy current type instrument of 1st Embodiment of this invention Sectional drawing which assembled
- 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, a second case body 9, a yoke 14 and a spring 15. Has been.
- 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 its shape is a shape in which the central portion is slightly raised upward 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, 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 coupled by a bush 3a made of synthetic resin.
- the pointer shaft 3 and the bush 3 a pass through the center of the rotor 2.
- the portion of the pointer shaft 3 that comes into contact with the bush 3a is provided with a non-slip process made of unevenness, and the pointer shaft 3 and the bush 3a prevent the idle rotation.
- the bush 3a is made of synthetic resin and is formed by insert molding so as to be coupled to the rotor 2 and the pointer shaft 3.
- a groove 3b for holding the spring 15 is provided.
- One end of the spring 15 is fitted into the groove 3b, and the bush 3a is melted by heat caulking, that is, by applying heat, and the spring 15 is fixed.
- annular protrusion 3c is provided on the lower surface (lower side in FIG. 2) of the bush 3a.
- the protrusion 3 c corresponds to a later-described recess provided in the first case body 8.
- 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. Further, 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. .
- an annular recess 8d is provided around the lower bearing portion 8a. Damper oil made of silicon oil is contained in the recess 8d. And the protrusion part 3c formed in the bush 3a has penetrated in the recessed part 8d in which the damper oil 10 entered.
- 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.
- Reference numeral 9c denotes a boss for fixing a dial plate (not shown) provided with an indicator portion indicated by the pointer 4.
- 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.
- the yoke 14 is made of a soft magnetic 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 has a spiral shape. Then, a force for rotating the pointer shaft 3 in a predetermined direction is applied.
- the spring 15 has one end fixed to the bush 3 a and the other end fixed to a hook shape that is press-fitted or hooked into the first case body 8.
- the spring 15 is also housed in the second housing portion 13, as with the yoke 14.
- the other end of the spring 15 is fixed to the first case body 8, but is not limited to this embodiment, and may be fixed to the second case body 9. . Further, both the first and second case bodies 8 and 9 may be fixed.
- a U-shaped hook portion 14a is formed inside the annular yoke 14, and the other end of the spring 15 is inserted into the hook portion 14a to deform the hook portion 14a by caulking. It may be fixed.
- the rotor 2 and the pointer shaft 3 are coupled by the bush 3a made of resin, one end of the spiral spring 15 is fixed to the bush 3a, and the other end of the spiral spring 15 is at least the second case.
- the rotor 2 and the pointer shaft 3 can be assembled 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.
- the damper oil 10 in the recess 8d of the first case body 8 it becomes possible to obtain a damping resistance between the rotor 1 and the first case body 8, and the conventional eddy current type instrument
- the structure can be simplified and an inexpensive eddy current type instrument can be provided.
- the spring 15 in addition to heat caulking, it may be fixed by UV bonding using a UV adhesive that cures in response to ultraviolet rays.
- the present invention can be used for an eddy current type 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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- General Physics & Mathematics (AREA)
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- Details Of Measuring Devices (AREA)
Abstract
Provided is an eddy-current meter wherein a rotor and a pointer shaft can be assembled inexpensively. An eddy-current meter (F) comprises a magnet (1), a main shaft (7) to which the magnet (1) is attached, a base plate (5) which supports the main shaft (7) rotatably, a rotor (2) which rotates as the magnet (1) rotates, a yoke (14) provided on the side opposite to the surface of the rotor (2) facing the magnet (1), a spiral spring (15) which regulates the amount of rotation caused by an eddy current generated in the rotor (2), a pointer shaft (3) being attached to the center of the rotor (2), a pointer (4) attached to the pointer shaft (3) and indicating the amount of measurement, a first case body (8) which supports the lower end of the pointer shaft (3) rotatably, and a second case body (9) which supports the portion of the pointer shaft (3) between the rotor (2) and the pointer (4) rotatably, wherein the magnet (1) is contained by the base plate (5) and the first case body (8), the rotor (2) is contained by the first case body (8) and the second case body (9), the rotor (2) and the pointer shaft (3) are coupled by means of a resin bush (3a), one end of the spiral spring (15) is fixed to the bush (3a), and the other end of the spiral spring (15) is fixed to any one of the first case body (8) or the second case body (9).
Description
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）。
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).
しかしながら、従来の渦電流式計器は、前記ロータと前記指針軸とを組み立てる際に、亜鉛ダイカストによる一体形成や切削部品による固定を行っており、安価に組み立てることが難しかった。
However, in the conventional eddy current type instrument, when assembling the rotor and the pointer shaft, they are integrally formed by zinc die casting or fixed by a cutting part, and it is difficult to assemble at low cost.
そこで、本発明は前述した問題点に着目し、ロータと指針軸とを安価に組み立て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。
Therefore, the present invention pays attention to the above-mentioned problems, and an object thereof is to provide an eddy current type instrument capable of assembling a rotor and a pointer shaft at low cost.
本発明は、磁石と、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、前記磁石の回転により回動するロータと、前記ロータの前記磁石の対向面とは反対の側に設けられたヨークと、前記ロータに発生する渦電流による回転量を規制する渦巻き状のバネと、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、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渦電流式計器において、前記ロータと前記指針軸とを樹脂からなるブッシュで結合し、前記渦巻き状のバネの一端を前記ブッシュに固定するとともに前記渦巻き状のバネの他端を少なくとも前記第１のケース体、前記第２のケース体または前記ヨークのいずれかに固定したものである。
The present invention includes a magnet, a main shaft on which the magnet is mounted, a base plate that rotatably supports the main shaft, a rotor that is rotated by the rotation of the magnet, and an opposite surface of the rotor facing the magnet. Yoke provided on the side, a spiral spring that regulates the amount of rotation caused by eddy currents generated in the rotor, a pointer shaft attached to the center of the rotor, and a measurement amount attached to the pointer shaft A pointer, a first case body that rotatably supports a lower end portion of the pointer shaft, and a second case body that rotatably supports between the rotor of the pointer shaft and the pointer, In the eddy current type instrument in which the magnet is housed in the base plate and the first case body, and the rotor is housed in the first case body and the second case body, the rotor, the pointer shaft, Made of resin And one end of the spiral spring is fixed to the bush, and the other end of the spiral spring is fixed to at least one of the first case body, the second case body, or the yoke. It is a thing.
また、本発明は、前記渦巻き状のバネの一端を前記ブッシュに熱加締めで固定したものである。
Further, according to the present invention, one end of the spiral spring is fixed to the bush by heat caulking.
また、本発明は、前記渦巻き状のバネの一端を前記ブッシュにＵＶ接着で固定したものである。
In the present invention, one end of the spiral spring is fixed to the bush by UV bonding.
本発明によれば、所期の目的を達成でき、ロータと指針軸とを安価に組み立て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 that can achieve the intended purpose and can assemble the rotor and the pointer shaft at low cost.
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、第２のケース体９、ヨーク１４およびバネ１５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, a second case body 9, a yoke 14 and a spring 15. Has been.
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 its shape is a shape in which the central portion is slightly raised upward 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, 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、合成樹脂からなるブッシュ３ａによって、結合されている。指針軸３とブッシュ３ａとは、ロータ２の中央を貫通している。指針軸３のブッシュ３ａと接触する部分には、凹凸からなる滑り止め加工が施されており、指針軸３とブッシュ３ａとで空回りを防止している。
The pointer shaft 3 is made of metal and is coupled by a bush 3a made of synthetic resin. The pointer shaft 3 and the bush 3 a pass through the center of the rotor 2. The portion of the pointer shaft 3 that comes into contact with the bush 3a is provided with a non-slip process made of unevenness, and the pointer shaft 3 and the bush 3a prevent the idle rotation.
ブッシュ３ａは、合成樹脂からなり、ロータ２と指針軸３と結合するように、インサート成形によって形成されている。バネ１５を保持する溝３ｂを備えており、この溝３ｂにバネ１５の一端を嵌め込んで、熱加締め、すなわち、熱を加えることによってブッシュ３ａを溶かして、バネ１５を固定してある。
The bush 3a is made of synthetic resin and is formed by insert molding so as to be coupled to the rotor 2 and the pointer shaft 3. A groove 3b for holding the spring 15 is provided. One end of the spring 15 is fitted into the groove 3b, and the bush 3a is melted by heat caulking, that is, by applying heat, and the spring 15 is fixed.
また、ブッシュ３ａの下面（図２中の下側）に円環状の突出部３ｃを備えている。この突出部３ｃは、第１のケース体８に設けた後述する凹部に対応するものである。
Further, an annular protrusion 3c is provided on the lower surface (lower side in FIG. 2) of the bush 3a. The protrusion 3 c corresponds to a later-described recess provided in the first case body 8.
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. Further, 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.
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. .
また、下軸受け部８ａの周囲に、環状の凹部８ｄを備えている。この凹部８ｄ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いる。そして、ダンパーオイル１０が入った凹部８ｄ内に、ブッシュ３ａに形成した突出部３ｃが入り込んでいる。
Further, an annular recess 8d is provided around the lower bearing portion 8a. Damper oil made of silicon oil is contained in the recess 8d. And the protrusion part 3c formed in the bush 3a has penetrated in the recessed part 8d in which the damper oil 10 entered.
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（図示していない）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. Reference numeral 9c denotes a boss for fixing a dial plate (not shown) provided with an indicator portion indicated by the pointer 4.
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.
ヨーク１４は、鉄やパーマロイなどの軟磁性体からなり、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 soft magnetic 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.
バネ１５は、金属からなり、渦巻き状である。そして、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。バネ１５は、一端がブッシュ３ａに固定され、他端が第１のケース体８に圧入または、引っ掛けて固定するフック形状に固定されている。また、バネ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。なお、本実施形態では、バネ１５の他端は、第１のケース体８に固定していたが、本実施形態に限定されるものではなく、第２のケース体９に固定しても良い。また、第１、第２のケース体８、９の両方で固定しても良い。あるいは、図４に示すように、環状のヨーク１４の内側にＵの字形状のフック部１４ａを形成し、このフック部１４ａ内にバネ１５の他端を差し込みカシメによってフック部１４ａを変形させて固定しても良い。
The spring 15 is made of metal and has a spiral shape. Then, a force for rotating the pointer shaft 3 in a predetermined direction is applied. The spring 15 has one end fixed to the bush 3 a and the other end fixed to a hook shape that is press-fitted or hooked into the first case body 8. The spring 15 is also housed in the second housing portion 13, as with the yoke 14. In the present embodiment, the other end of the spring 15 is fixed to the first case body 8, but is not limited to this embodiment, and may be fixed to the second case body 9. . Further, both the first and second case bodies 8 and 9 may be fixed. Alternatively, as shown in FIG. 4, a U-shaped hook portion 14a is formed inside the annular yoke 14, and the other end of the spring 15 is inserted into the hook portion 14a to deform the hook portion 14a by caulking. It may be fixed.
以上の構成によって、ロータ２と指針軸３とを樹脂からなるブッシュ３ａで結合し、渦巻き状のバネ１５の一端をブッシュ３ａに固定するとともに渦巻き状のバネ１５の他端を少なくとも第２のケース体９に固定したことによって、ロータ２と指針軸３とを安価に組み立てることができる。
With the above configuration, the rotor 2 and the pointer shaft 3 are coupled by the bush 3a made of resin, one end of the spiral spring 15 is fixed to the bush 3a, and the other end of the spiral spring 15 is at least the second case. By fixing to the body 9, the rotor 2 and the pointer shaft 3 can be assembled 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、第１のケース体８の凹部８ｄ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 providing the damper oil 10 in the recess 8d of the first case body 8, it becomes possible to obtain a damping resistance between the rotor 1 and the first case body 8, and the conventional eddy current type instrument Thus, by eliminating the need for an oil cup for holding the damper oil, the structure can be simplified and an inexpensive eddy current type instrument can be provided.
なお、ブッシュ３にバネ１５を固定する手段としては、熱加締めの他に、紫外線に反応して硬化するＵＶ接着剤を用いるＵＶ接着によって固定しても良い。
In addition, as means for fixing the spring 15 to the bush 3, in addition to heat caulking, it may be fixed by UV bonding using a UV adhesive that cures in response to ultraviolet rays.
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利用可能である。
The present invention can be used for an eddy current type instrument that rotates a rotor in accordance with the rotation of a magnet and drives a pointer by the rotation of the rotor.
Ｆ 渦電流式計器
１ 磁石
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
９ 第２のケース体
１４ ヨーク
１４ａ フック部
１５ バネ F Eddycurrent type instrument 1 Magnet 2 Rotor 3 Pointer shaft 3a Bush 4 Pointer 5 Base plate 5a Boss body 5b Recessed portion 6 Bearing portion 7 Main shaft 8 First case body 9 Second case body 14 York 14a Hook portion 15 Spring
１ 磁石
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
９ 第２のケース体
１４ ヨーク
１４ａ フック部
１５ バネ F Eddy
Claims (3)
- 磁石と、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、前記磁石の回転により回動するロータと、前記ロータの前記磁石の対向面とは反対の側に設けられたヨークと、前記ロータに発生する渦電流による回転量を規制する渦巻き状のバネと、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、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渦電流式計器において、前記ロータと前記指針軸とを樹脂からなるブッシュで結合し、前記渦巻き状のバネの一端を前記ブッシュに固定するとともに前記渦巻き状のバネの他端を少なくとも前記第１のケース体、前記第２のケース体または前記ヨークのいずれかに固定したことを特徴とする渦電流式計器。 A magnet, a main shaft on which the magnet is mounted, a base plate that rotatably supports the main shaft, a rotor that rotates by rotation of the magnet, and a surface of the rotor opposite to the facing surface of the magnet are provided. A yoke, a spiral spring that regulates the amount of rotation caused by the eddy current generated in the rotor, a pointer shaft that is attached to the center of the rotor, a pointer that is attached to the pointer shaft and indicates a measurement amount, A first case body rotatably supporting a lower end portion of the pointer shaft; and a second case body rotatably supported between the rotor of the pointer shaft and the pointer. In an eddy current type instrument in which the magnet is housed in a first case body and the rotor is housed in the first case body and the second case body, the rotor and the pointer shaft are made of resin. Combined with bush One end of the spiral spring is fixed to the bush, and the other end of the spiral spring is fixed to at least one of the first case body, the second case body, or the yoke. Eddy current type instrument.
- 前記渦巻き状のバネの一端を前記ブッシュに熱加締めで固定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 one end of the spiral spring is fixed to the bush by heat caulking.
- 前記渦巻き状のバネの一端を前記ブッシュにＵＶ接着で固定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 one end of the spiral spring is fixed to the bush by UV bonding.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-252697 | 2008-09-30 | ||
| JP2008252697A JP2010085161A (en) | 2008-09-30 | 2008-09-30 | Eddy current type instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010038603A1 true WO2010038603A1 (en) | 2010-04-08 |
Family
ID=42073372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2009/065987 WO2010038603A1 (en) | 2008-09-30 | 2009-09-14 | Eddy-current meter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2010085161A (en) |
| WO (1) | WO2010038603A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4873677U (en) * | 1971-12-20 | 1973-09-13 | ||
| JPS5597451U (en) * | 1978-12-22 | 1980-07-07 | ||
| JPS55125509U (en) * | 1979-02-28 | 1980-09-05 | ||
| JP2003035854A (en) * | 2001-07-24 | 2003-02-07 | Kanto Tatsumi Denshi Kk | Lens barrel manufacturing method and lens barrel |
-
2008
- 2008-09-30 JP JP2008252697A patent/JP2010085161A/en active Pending
-
2009
- 2009-09-14 WO PCT/JP2009/065987 patent/WO2010038603A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4873677U (en) * | 1971-12-20 | 1973-09-13 | ||
| JPS5597451U (en) * | 1978-12-22 | 1980-07-07 | ||
| JPS55125509U (en) * | 1979-02-28 | 1980-09-05 | ||
| JP2003035854A (en) * | 2001-07-24 | 2003-02-07 | Kanto Tatsumi Denshi Kk | Lens barrel manufacturing method and lens barrel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010085161A (en) | 2010-04-15 |
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