JP4941824B2 - Rotation detector - Google Patents

Rotation detector Download PDF

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JP4941824B2
JP4941824B2 JP2007020235A JP2007020235A JP4941824B2 JP 4941824 B2 JP4941824 B2 JP 4941824B2 JP 2007020235 A JP2007020235 A JP 2007020235A JP 2007020235 A JP2007020235 A JP 2007020235A JP 4941824 B2 JP4941824 B2 JP 4941824B2
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magnetic
shaft member
housing
rotation
conversion element
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JP2008185490A (en
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智幸 田中
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Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
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Priority to JP2007020235A priority Critical patent/JP4941824B2/en
Priority to PCT/JP2008/050734 priority patent/WO2008093558A1/en
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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
    • G01D5/142—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 using Hall-effect devices
    • G01D5/145—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 using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • 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
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

本発明は、被検出体の動作角度を検出する回転検出装置に関するものであって、例えば自動車のスロットルポジションセンサやステアリング角度センサに好適である。   The present invention relates to a rotation detection device that detects an operating angle of a detected object, and is suitable for a throttle position sensor and a steering angle sensor of an automobile, for example.

従来の回転検出装置は、特許文献１に開示されるものが知られている。この回転検出装置は、回転体の回転を受けて回転するシャフト部材に磁石を配設し、この磁石の回転による磁力変化を磁気変換素子により検出するものであり、前記シャフト部材を配設するケース体と、前記磁気変換素子を備える回路基板を配設するホルダとを別体に設ける構造を採用している。
As a conventional rotation detection device, one disclosed in Patent Document 1 is known. This rotation detector is a case in which a magnet is disposed on a shaft member that rotates in response to the rotation of a rotating body, and a change in magnetic force due to the rotation of the magnet is detected by a magnetic conversion element. A structure in which a body and a holder on which a circuit board including the magnetic conversion element is disposed is provided separately.

しかしながら、このような回転検出装置は、前記ケース体と前記ホルダとを別体に設けるために構造が複雑になり、構成部品が多くなることから前記磁気変換素子の検出精度が低下し、正確な磁力変化を検出できず、検出精度が低下する虞があるといった問題点を有している。   However, in such a rotation detection device, since the case body and the holder are provided separately, the structure becomes complicated and the number of components increases, so that the detection accuracy of the magnetic transducer element is reduced and accurate. There is a problem that a change in magnetic force cannot be detected and the detection accuracy may be reduced.

そこで、本発明は前述した問題点に着目し、構造を簡素化し、検出精度を向上させることが可能な回転検出装置を提供することを目的とする。   Therefore, the present invention focuses on the above-described problems, and an object thereof is to provide a rotation detection device capable of simplifying the structure and improving detection accuracy.

本発明は、回転体の回転を受けて回転するシャフト部材に磁石を配設し、前記磁石の回転による磁力変化を磁気変換素子により検出する回転検出装置であって、前記シャフト部材を回転可能に配設する第１の収納部と、前記磁気変換素子を回路基板を介して配設する第２の収納部とを互いに連通しないように一体にハウジングに設け、前記シャフト部材に段差部を設け、前記段差部に座金を配設し、前記第１の収納部の上端部の少なくとも一部分を前記座金方向にかしめることで、前記第１の収納部に対して前記シャフト部材をスラスト規制してなるたものである。
The present invention is a rotation detection device in which a magnet is disposed on a shaft member that rotates in response to the rotation of a rotating body, and a change in magnetic force due to the rotation of the magnet is detected by a magnetic conversion element. A first housing portion to be disposed and a second housing portion to which the magnetic conversion element is disposed via a circuit board are integrally provided in the housing so as not to communicate with each other , and a step portion is provided in the shaft member. A washer is disposed in the stepped portion, and at least a part of an upper end portion of the first storage portion is caulked in the washer direction, thereby thrust-regulating the shaft member with respect to the first storage portion. It is a thing.

また、本発明は、前記第２の収納部は、前記磁気変換素子を収納する凹部を備えてなるものである。   According to the present invention, the second storage portion includes a recess for storing the magnetic transducer.

また、本発明は、前記第２の収納部に硬化樹脂が充填されてなるものである。   In the present invention, the second storage portion is filled with a cured resin.

本発明によれば、所期の目的を達成でき、構造を簡素化し、検出精度を向上させることが可能な回転検出装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the rotation detection apparatus which can achieve the intended objective, can simplify a structure, and can improve a detection precision can be provided.

以下、添付図面に基づいて本発明の実施形態を説明する。図１，図２は、本発明の実施形態を示すもので、以下、これらに基づいて本発明の実施形態を例えば車両に搭載されるステアリングの回転角度を検出する回転検出装置に適用した場合について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 show an embodiment of the present invention. Hereinafter, based on these, the embodiment of the present invention is applied to, for example, a rotation detection device that detects a rotation angle of a steering mounted on a vehicle. explain.

図１，図２において、本実施形態による回転検出装置Ａは、ハウジング１と、シャフト部材２と、磁石（磁力発生部材）３と、磁気変換素子４と、回路基板５とから主に構成される。   1 and 2, the rotation detection device A according to the present embodiment is mainly composed of a housing 1, a shaft member 2, a magnet (magnetic force generating member) 3, a magnetic conversion element 4, and a circuit board 5. The

ハウジング１は、ポリブチレンテレフタレート等の熱可塑性樹脂材料からなり、略円筒形状に形成された基部（筒状部）１ａを備えている。この筒状部１ａによって、シャフト部材２を回転可能に配設する第１の収納部である空洞部１ｉが形成されている。   The housing 1 is made of a thermoplastic resin material such as polybutylene terephthalate, and includes a base portion (tubular portion) 1a formed in a substantially cylindrical shape. The cylindrical portion 1a forms a hollow portion 1i that is a first storage portion in which the shaft member 2 is rotatably disposed.

また、空洞部１ｉを形成する筒状部１ａの上端部１ｂには、後述する座金をかしめ固定するための一対のかしめ片１ｃが突出形成されている。   In addition, a pair of caulking pieces 1c for caulking and fixing a later-described washer is formed on the upper end portion 1b of the cylindrical portion 1a forming the hollow portion 1i.

また、各かしめ片１ｃの形成される箇所とは反対側となる筒状部１ａの下端部１ｄには、回路基板５の周囲を取り巻く環状壁部１ｅが延長形成されている。つまり、環状壁部１ｅによって、第２の収納部である空間部１ｍ内に磁気変換素子４と回路基板５とが配設される。   An annular wall portion 1e surrounding the circuit board 5 is extended and formed at the lower end portion 1d of the cylindrical portion 1a on the side opposite to the portion where the caulking pieces 1c are formed. That is, the magnetic conversion element 4 and the circuit board 5 are disposed in the space 1m that is the second storage portion by the annular wall portion 1e.

そして、第１の収納部である空洞部１ｉと第２の収納部である空間部１ｍとは、ハウジング１に一体に設けられている。   The hollow portion 1 i that is the first storage portion and the space portion 1 m that is the second storage portion are provided integrally with the housing 1.

なお、１ｆは、回路基板５に実装される磁気変換素子４を収納するための略袋形状（断面略凹部形状）からなる収納部（凹部）であり、第１の収納部である空洞部１ｉ内に突出形成された突出部１ｎ内に設けられている。かかる突出部１ｎは、その開口端部１ｇが略円環板形状に形成された連結部１ｈを介して筒状部１ａの下端部１ｄと連結される構成となっている。言い換えると、収納部１ｆは、筒状部１ａの内部空間となる空洞部１ｉに配設されるシャフト部材２の後述する第２の凹部に収納されているとも言える。また、第１の収納部である空洞部１ｉと第２の収納部である空間部１ｍとを、突出部１ｎ、連結部１ｈとで互いに連通しないように区切るものである。
Note that 1 f is a storage portion (concave portion) having a substantially bag shape (substantially concave shape in cross section) for storing the magnetic conversion element 4 mounted on the circuit board 5, and a hollow portion 1 i that is a first storage portion. It is provided in a projecting portion 1n formed so as to project inside. The projecting portion 1n is configured to be connected to the lower end portion 1d of the cylindrical portion 1a via a connecting portion 1h whose opening end portion 1g is formed in a substantially annular plate shape. In other words, it can be said that the accommodating portion 1f is accommodated in a second recess, which will be described later, of the shaft member 2 disposed in the hollow portion 1i serving as the internal space of the cylindrical portion 1a. Further, the hollow portion 1i as the first storage portion and the space portion 1m as the second storage portion are separated from each other by the protruding portion 1n and the connecting portion 1h.

また、１ｊは、リング状の磁性部材６の外周部を配設固定するために切り欠き形成された環状溝部であり、この環状溝部１ｊは、筒状部１ａの内部空間となる空洞部１ｉの内壁面を切り欠くことで得られるものである。なお、１ｋは、後述する座金の外縁部を支持する受部であり、この受部１ｋは、上端部１ｂに設けられ、シャフト部材２をハウジング１に収納した際に、シャフト部材２の後述する第１の載置面と略同一面上に位置するようになっている。   Reference numeral 1j denotes an annular groove formed by cutting out and fixing the outer peripheral portion of the ring-shaped magnetic member 6, and this annular groove 1j is formed in the cavity 1i serving as an internal space of the tubular portion 1a. It is obtained by cutting out the inner wall surface. In addition, 1k is a receiving part which supports the outer edge part of the washer mentioned later, This receiving part 1k is provided in the upper end part 1b, and when the shaft member 2 is accommodated in the housing 1, the shaft member 2 will be described later. It is located on substantially the same plane as the first placement surface.

そして、本実施形態の場合、ハウジング１と磁性部材６とは、インサート成形によって一体的に形成されている。あるいは、磁性部材６をハウジング１の環状溝部１ｊに圧入固定することで、ハウジング１と磁性部材６とを一体的に形成してもよい。このようにハウジング１とリング状の磁性部材６とを一体形成した場合、リング状の磁性部材６の内周側上端面は、シャフト部材２をハウジング１に収納した際に、シャフト部材２の後述する平坦面と当接することから、前記平坦面を支持する支持部としての機能を有している。
In the case of this embodiment, the housing 1 and the magnetic member 6 are integrally formed by insert molding. Alternatively, the housing 1 and the magnetic member 6 may be integrally formed by press-fitting and fixing the magnetic member 6 in the annular groove 1j of the housing 1. Thus when integrally forming the magnetic member 6 of the housing 1 and the ring-shaped, inner peripheral side upper end face of the ring-shaped magnetic member 6, upon receiving the shaft member 2 in the housing 1, below the shaft member 2 Since it abuts against the flat surface, it functions as a support portion for supporting the flat surface.

シャフト部材２は、ポリアセタール等の合成樹脂材料からなり、断面略「Ｈ」字形状に形成され、略円筒形状からなるベース部（円筒部）２ａと、この円筒部２ａの内部空間領域を上下に分割すべく配設される円板部２ｂとを備えている。つまり、円筒部２ａは、その内部空間領域の略中央部に円板部２ｂを介在させたことによって、ともに略円筒カップ形状からなる円筒部２ａの上方に形成される第１の凹部２ｃと、円筒部２ａの下方に形成される第２の凹部２ｄとを備える。   The shaft member 2 is made of a synthetic resin material such as polyacetal, is formed in a substantially “H” cross section, and has a substantially cylindrical base portion (cylindrical portion) 2 a and an internal space region of the cylindrical portion 2 a up and down. And a disc portion 2b arranged to be divided. That is, the cylindrical portion 2a includes a first concave portion 2c formed above the cylindrical portion 2a having a substantially cylindrical cup shape by interposing the disc portion 2b at a substantially central portion of the inner space region thereof. And a second recess 2d formed below the cylindrical portion 2a.

略円筒カップ型の第１の凹部２ｃの先端部２ｅ（言い換えると、前記座金の図中上側に突出している第１の凹部２ｃの先端部２ｅ箇所）は、被検出体（回転体）であるステアリングに直接またはギア等の部材を介して接続される。これにより先端部２ｅは、前記ステアリングの回転と同期してシャフト部材２を回転させるための回転入力部（回転伝達部）としての機能を有している。   The tip portion 2e of the substantially cylindrical cup-shaped first recess 2c (in other words, the tip portion 2e of the first recess 2c projecting upward in the drawing of the washer) is a detection object (rotary body). It is connected to the steering directly or via a member such as a gear. Thereby, the front-end | tip part 2e has a function as a rotation input part (rotation transmission part) for rotating the shaft member 2 synchronizing with rotation of the said steering.

なお、第１の凹部２ｃの外壁面には、先端部２ｅの下方に階段形状からなる第１，第２の載置面２ｆ，２ｇがそれぞれ形成されており、先端部２ｅに隣接している第１の載置面２ｆは、前記座金の内縁部を載置するため段差部であり、第１の載置面２ｆよりも一段低い位置に位置する第２の載置面２ｇは、後述するＯリングを載置するためのものである。   In addition, on the outer wall surface of the first recess 2c, first and second mounting surfaces 2f and 2g each having a step shape are formed below the tip portion 2e, and are adjacent to the tip portion 2e. The first placement surface 2f is a stepped portion for placing the inner edge portion of the washer, and the second placement surface 2g located at a position one step lower than the first placement surface 2f will be described later. This is for placing an O-ring.

一方、略円筒カップの第２の凹部２ｄには、ハウジング１の収納部１ｆを備えた突出部１ｎ並びに磁気変換素子４が収納されるとともに、第２の凹部２ｄの略円形状からなる側部側内壁面２ｈには、磁石３を収納するために磁石３の形状に対応した環状溝形状からなる環状凹部２ｉが形成されている。
On the other hand, in the second concave portion 2d of the substantially cylindrical cup, the projecting portion 1n having the housing portion 1f of the housing 1 and the magnetic transducer 4 are housed, and the side portion of the second concave portion 2d having a substantially circular shape. On the side inner wall surface 2h, an annular recess 2i having an annular groove shape corresponding to the shape of the magnet 3 is formed in order to accommodate the magnet 3.

なお、２ｊは、第２の凹部２ｄの外壁面を構成する円形状からなる外周面であり、この外周面２ｊは、第２の載置面２ｇの外周面を構成する円形外周面よりも若干、径小に設定されている。この円形の外周面２ｊと第２の載置面２ｇの外周面を構成する前記円形外周面とを繋ぐ環状平坦面２ｋは、シャフト部材２をハウジング１内に収納したときに、磁性部材６の前記内周側上端面によって支持される構成となる。つまり、環状平坦面２ｋは、シャフト部材２をハウジング１内に収納したときに磁性部材６の内周側上端面と所定箇所で当接することで、シャフト部材２のスラスト方向（シャフト部材２の後述する中心軸方向）に対する移動を規制する規制部（位置規制部）としての機能を有している。   Reference numeral 2j denotes a circular outer peripheral surface constituting the outer wall surface of the second recess 2d, and this outer peripheral surface 2j is slightly larger than the circular outer peripheral surface constituting the outer peripheral surface of the second mounting surface 2g. The diameter is set to be small. An annular flat surface 2k that connects the circular outer peripheral surface 2j and the circular outer peripheral surface constituting the outer peripheral surface of the second mounting surface 2g is formed when the shaft member 2 is housed in the housing 1 and the magnetic member 6 is It becomes the structure supported by the said inner peripheral side upper end surface. In other words, the annular flat surface 2k abuts the upper end surface on the inner peripheral side of the magnetic member 6 at a predetermined position when the shaft member 2 is housed in the housing 1, so that the thrust direction of the shaft member 2 (the shaft member 2 will be described later). It functions as a restricting part (position restricting part) that restricts movement in the direction of the center axis.

また、１０は、シャフト部材２における第１の凹部２ｃの外壁面に形成される第２の載置面２ｇ上に載置されるＯリングであり、かかるＯリング１０は、載置面２ｇと、各載置面２ｆ，２ｇを繋ぐ側面Ｐ１と、ハウジング１における上端部１ｂの内壁面Ｐ２とで囲まれる間隙に埋設され、回転検出装置Ａ内部に水等の異物が浸入するのを防止する機能を有している。なお、Ｏリング１０は、シャフト部材２における第２の凹部２ｄの外周面２ｊと第２の載置面２ｇの前記円形外周面とを繋ぐ環状平坦面２ｋが、磁性部材６の内周側上端面と当接するように、シャフト部材２をハウジング１内に収納した後、前記間隙に埋設される。また、断面円形状のＯリング１０に代えて、断面Ｘ字形状のＸリングを採用することも可能である。   Reference numeral 10 denotes an O-ring mounted on the second mounting surface 2g formed on the outer wall surface of the first recess 2c in the shaft member 2, and the O-ring 10 includes the mounting surface 2g. It is embedded in a gap surrounded by the side surface P1 connecting the mounting surfaces 2f and 2g and the inner wall surface P2 of the upper end portion 1b of the housing 1, and prevents foreign substances such as water from entering the rotation detection device A. It has a function. The O-ring 10 has an annular flat surface 2k that connects the outer peripheral surface 2j of the second recess 2d in the shaft member 2 and the circular outer peripheral surface of the second mounting surface 2g on the inner peripheral side of the magnetic member 6. After the shaft member 2 is accommodated in the housing 1 so as to abut the end surface, it is embedded in the gap. Further, instead of the O-ring 10 having a circular cross section, an X ring having an X-shaped cross section may be employed.

さらに、１１は、シャフト部材２における第１の凹部２ｃの外壁面に形成される第１の載置面２ｆとハウジング１の上端部１ｂに設けられた受部１ｋとに載置される座金であり、かかる座金１１は、前記間隙にＯリング１０を埋設してから、Ｏリング１０を覆うように載置面２ｆ及び受部１ｋ上にかしめ固定される。具体的には、座金１１は、その内縁側底面部がシャフト部材２の第１の載置面２ｆによって支持され、且つその外縁側底面部がハウジング１の受部１ｋによって支持された後、一対のかしめ片１ｃをシャフト部材２の後述する中心軸側（言い換えれば、座金１１側）にそれぞれかしめることで、シャフト部材２がハウジング１にかしめ固定される構成となる。   Further, 11 is a washer placed on the first placement surface 2f formed on the outer wall surface of the first recess 2c in the shaft member 2 and the receiving portion 1k provided on the upper end portion 1b of the housing 1. The washer 11 is caulked and fixed on the mounting surface 2f and the receiving portion 1k so as to cover the O-ring 10 after the O-ring 10 is embedded in the gap. Specifically, after the inner edge side bottom surface portion of the washer 11 is supported by the first placement surface 2 f of the shaft member 2 and the outer edge side bottom surface portion of the washer 11 is supported by the receiving portion 1 k of the housing 1, The shaft member 2 is caulked and fixed to the housing 1 by caulking the caulking pieces 1c to the later-described center axis side of the shaft member 2 (in other words, the washer 11 side).

磁石３は、略円環形状に形成され、２極着磁されている。また、磁石３は、磁気変換素子４（磁気変換素子４の後述するリード部を除いた部分）を取り巻くようにシャフト部材２における第２の凹部２ｄの環状凹部２ｉ内に圧入固定され、シャフト部材２の回転とともにシャフト部材２の回転中心軸Ｌの周りを回転する構成となっている。このことは、磁石３の回転中心軸が、シャフト部材２の回転中心軸Ｌと略一致していることを意味している。   The magnet 3 is formed in a substantially annular shape and is dipole magnetized. Further, the magnet 3 is press-fitted and fixed in the annular recess 2i of the second recess 2d in the shaft member 2 so as to surround the magnetic conversion element 4 (a portion excluding a lead portion described later of the magnetic conversion element 4). It is configured to rotate around the rotation center axis L of the shaft member 2 with the rotation of 2. This means that the rotation center axis of the magnet 3 substantially coincides with the rotation center axis L of the shaft member 2.

磁気変換素子４は、ホールＩＣやＭＲ素子等の検出素子からなり、リード部４ａを介して回路基板５と電気的に接続され、シャフト部材２とともに回転する磁石３の回転に応じて変化する磁力の大きさを検出信号に変換して、かかる検出信号を回路基板５上に実装された端子（図示せず）を通じて外部に出力するものである。また、磁気変換素子４は、その磁気検出面がハウジング１の収納部１ｆを介して磁石３の内壁面（着磁面）と対向するように配設される。   The magnetic conversion element 4 includes a detection element such as a Hall IC or an MR element, and is electrically connected to the circuit board 5 via the lead portion 4a and changes in accordance with the rotation of the magnet 3 that rotates together with the shaft member 2. Is converted into a detection signal, and the detection signal is output to the outside through a terminal (not shown) mounted on the circuit board 5. The magnetic transducer 4 is disposed such that its magnetic detection surface faces the inner wall surface (magnetized surface) of the magnet 3 via the housing portion 1 f of the housing 1.

そして、本実施形態の場合、磁気変換素子４は、シャフト部材２の回転中心軸Ｌ上ではなく、シャフト部材２の回転中心軸Ｌから外れた位置、すなわちシャフト部材２の回転中心軸Ｌから所定量だけ離れた位置に配設され、ハウジング１における収納部１ｆの内壁面と当接するように位置決め固定されている。なお、磁気変換素子４をシャフト部材２の回転中心軸Ｌ上に配設してもよいが、磁気変換素子４から出力される検出信号（出力電圧）の出力特性（直線性）を考慮した場合、磁気変換素子４をシャフト部材２の回転中心軸Ｌから外れた位置に配設することが望ましい。このことは、磁気変換素子４を回転中心軸Ｌ上ではなく回転中心軸Ｌから外れた位置に配設した方が、前記出力電圧の直線性が良好となることを意味している。   In the case of this embodiment, the magnetic conversion element 4 is not on the rotation center axis L of the shaft member 2 but at a position deviated from the rotation center axis L of the shaft member 2, that is, from the rotation center axis L of the shaft member 2. It is disposed at a position separated by a fixed amount, and is positioned and fixed so as to come into contact with the inner wall surface of the housing portion 1 f in the housing 1. The magnetic conversion element 4 may be disposed on the rotation center axis L of the shaft member 2, but in consideration of the output characteristics (linearity) of the detection signal (output voltage) output from the magnetic conversion element 4. The magnetic conversion element 4 is preferably disposed at a position deviating from the rotation center axis L of the shaft member 2. This means that the linearity of the output voltage is better when the magnetic conversion element 4 is arranged not at the rotation center axis L but at a position away from the rotation center axis L.

回路基板５は、例えば硬質回路基板からなり、ハウジング１の連結部１ｈの裏面に沿うように配設され、ハウジング１における環状壁部１ｅの内部空間である空間部１ｍに収納固定される。かかる回路基板５には、磁気変換素子４や前記端子、並びにコンデンサ等の各種電子部品が実装されている。また、５ａは、磁気変換素子４のリード部４ａが貫通する孔である。   The circuit board 5 is made of, for example, a hard circuit board, is disposed along the back surface of the connecting portion 1 h of the housing 1, and is housed and fixed in a space portion 1 m that is an internal space of the annular wall portion 1 e in the housing 1. Various electronic components such as the magnetic transducer 4, the terminal, and the capacitor are mounted on the circuit board 5. Reference numeral 5a denotes a hole through which the lead portion 4a of the magnetic transducer 4 passes.

なお、本実施形態の場合、回路基板５は、ハウジング１の連結部１ｈ底面から下方（回路基板５側）に突出形成された図示しない複数の突出ピンがそれぞれ貫通する図示しない複数の貫通孔部を備えている。従って、磁気変換素子４の実装された回路基板５をハウジング１に固定するにあたっては、連結部１ｈに一体形成された前記各突出ピンを回路基板５の前記各貫通孔部に貫通させ、さらに回路基板５の背面側に突出する前記各突出ピンの突出端部を熱溶着すればよい。   In the case of this embodiment, the circuit board 5 has a plurality of through-hole portions (not shown) through which a plurality of projecting pins (not shown) projecting downward (circuit board 5 side) from the bottom surface of the connecting portion 1h of the housing 1 pass. It has. Therefore, when fixing the circuit board 5 on which the magnetic conversion element 4 is mounted to the housing 1, the protruding pins formed integrally with the connecting portion 1h are passed through the through-hole portions of the circuit board 5, and the circuit What is necessary is just to heat-weld the protrusion edge part of each said protrusion pin which protrudes in the back side of the board | substrate 5. FIG.

磁性部材６は、鉄等の磁性材料からなり、略円筒状に形成され、磁石３の周囲を取り巻くようにハウジング１の環状溝部１ｊに固定（保持）されている。また、略円筒状の磁性部材６は、その円形内周面（円形内壁面）がシャフト部材２における第２の凹部２ｄの円形状の外周面２ｊと当接していることで、シャフト部材２の回転時において、シャフト部材２を回転可能に軸支する軸支部材（軸受部材）としての機能を有している。   The magnetic member 6 is made of a magnetic material such as iron, is formed in a substantially cylindrical shape, and is fixed (held) to the annular groove portion 1 j of the housing 1 so as to surround the magnet 3. Further, the substantially cylindrical magnetic member 6 has a circular inner peripheral surface (circular inner wall surface) in contact with the circular outer peripheral surface 2j of the second concave portion 2d of the shaft member 2, so that the shaft member 2 During rotation, the shaft member 2 has a function as a shaft support member (bearing member) that rotatably supports the shaft member 2.

そして、本実施形態の場合、磁性部材６が、リング状の磁石３の外周を覆うようにハウジング１の環状溝部１ｊに配設固定されていることで、磁石３の磁束分布は、２極着磁された磁石３の内部空間において磁気変換素子４の前記磁気検出面を通過するように分布するとともに磁性部材６の内部を通っており、磁性部材６の外側（周囲）に漏れる漏洩磁束は無くなる。これにより磁性部材６を設けたことで、前記漏洩磁束が無くなるので、磁気変換素子４を通過する磁力、言い換えると角度検出に利用される磁力が磁性部材６を設けない場合に比べて大きくなり、検出精度を向上させることができる。
In the case of the present embodiment, the magnetic member 6 is disposed and fixed in the annular groove 1j of the housing 1 so as to cover the outer periphery of the ring-shaped magnet 3, so that the magnetic flux distribution of the magnet 3 is dipolar. In the internal space of the magnetized magnet 3, the magnetic flux is distributed so as to pass through the magnetic detection surface of the magnetic transducer 4 and passes through the inside of the magnetic member 6, so that no leakage magnetic flux leaks to the outside (periphery) of the magnetic member 6. . Since the magnetic flux is eliminated by providing the magnetic member 6, the magnetic force passing through the magnetic conversion element 4, in other words, the magnetic force used for angle detection is larger than when the magnetic member 6 is not provided, Detection accuracy can be improved.

さらに、磁性部材６が、リング状の磁石３の外周を覆うようにハウジング１の環状溝部１ｊに配設固定されていることで、所定の外部装置等から生じている磁力が回転検出装置Ａに作用していたとしても、かかる外部からの磁力は、磁性部材６内を選択的に通るものの磁性部材６の内側（つまり、磁石３内）を通ることは無くなる。これにより磁性部材６を設けたことで、磁石３の磁束は、外部からの磁力の影響を受けることが無くなるため、磁性部材６を設けない場合に必然的に生じていた磁気干渉（つまり、磁性部材６を設けない場合において、磁石３の周囲を通る磁束と外部磁束との干渉により生じる磁気干渉）が防止され、検出精度の良好な回転検出装置を提供することができる。   Further, since the magnetic member 6 is disposed and fixed in the annular groove 1j of the housing 1 so as to cover the outer periphery of the ring-shaped magnet 3, the magnetic force generated from a predetermined external device or the like is applied to the rotation detection device A. Even if it acts, the magnetic force from the outside selectively passes through the inside of the magnetic member 6 but does not pass through the inside of the magnetic member 6 (that is, inside the magnet 3). By providing the magnetic member 6, the magnetic flux of the magnet 3 is not affected by the external magnetic force. Therefore, the magnetic interference (that is, the magnetic property) that is inevitably generated when the magnetic member 6 is not provided. In the case where the member 6 is not provided, magnetic interference caused by interference between the magnetic flux passing around the magnet 3 and the external magnetic flux) is prevented, and a rotation detection device with good detection accuracy can be provided.

以上の各部により、シャフト部材２（前記被検出体）の回転に応じた検出信号を出力することが可能な回転検出装置Ａが構成されている。なお、図１に示すように磁気変換素子４の実装された回路基板５を収納する環状壁部１ｅの内部空間である空間部１ｍ、並びに磁気変換素子４を収納するように空間部１ｍと連通している収納部１ｆには、エポキシやシリコーン等からなる液体から固体へと硬化する樹脂からなる硬化樹脂７が充填されており、これにより磁気変換素子４及び回路基板５が、ハウジング１内において気密的に収納保持されるようになっている。
The rotation detection device A that can output a detection signal corresponding to the rotation of the shaft member 2 (the detected body) is configured by the above-described units. As shown in FIG. 1, the space 1m that is the internal space of the annular wall 1e that houses the circuit board 5 on which the magnetic transducer 4 is mounted, and the space 1m that communicates with the magnetic transducer 4 are accommodated. The housing portion 1f is filled with a cured resin 7 made of a resin that hardens from a liquid made of epoxy, silicone, or the like to a solid, whereby the magnetic conversion element 4 and the circuit board 5 are accommodated in the housing 1. It is designed to be stored and held in an airtight manner.

以上のように本実施形態では、シャフト部材２を回転可能に配設する第１の収納部１ｉと磁気変換素子４を回路基板５を介して配設する第２の収納部１ｍとを互いに連通しないように一体にハウジング１に設けたことで、シャフト部材２と磁気変換素子４を備えた回路基板５とを一体化したハウジング１に設けることによって、構成が簡素化させることができる。   As described above, in the present embodiment, the first storage portion 1i in which the shaft member 2 is rotatably disposed and the second storage portion 1m in which the magnetic conversion element 4 is disposed via the circuit board 5 are communicated with each other. By providing the housing 1 so as not to be integrated, the configuration can be simplified by providing the shaft member 2 and the circuit board 5 including the magnetic conversion element 4 in the integrated housing 1.

また、第２の収納部１ｍに磁気変換素子４を収納する凹部１ｆとを備える構造を採用するため、磁気変換素子４を磁石３に近接配置させることが可能となるため、検出精度を更に向上させることができる。
In addition, since a structure including the concave portion 1f for accommodating the magnetic transducer element 4 in the second accommodating portion 1m is adopted, the magnetic transducer element 4 can be disposed close to the magnet 3, thereby further improving detection accuracy. Can be made.

また、シャフト部材２に段差部２ｆを設け、この段差部２ｆに座金１１を配設し、第１の収納部１ｉの上端部１ｂの一部分を座金１１方向にかしめることで、第１の収納部１ｉに対してシャフト部材２をスラスト規制するものであり、シャフト部材２に配設される磁石３のスラスト方向の変動が規制されることになるため、検出精度を向上させることができ、しかも第１の収納部１ｉからのシャフト部材２の脱落を防止することができる。
Further, the shaft member 2 is provided with a stepped portion 2f, a washer 11 is provided on the stepped portion 2f, and a part of the upper end portion 1b of the first storing portion 1i is caulked in the direction of the washer 11, thereby the first storing. The shaft member 2 is subjected to thrust restriction with respect to the portion 1i, and fluctuations in the thrust direction of the magnet 3 disposed on the shaft member 2 are restricted, so that the detection accuracy can be improved, and The shaft member 2 can be prevented from falling off from the first storage portion 1i.

また、第２の収納部１ｍにＵＶ硬化型あるいは熱硬化型樹脂からなる硬化樹脂７を充填することによって、防水性に優れる回転検出装置Ａを得ることができる。
Further, by filling a cured resin 7 composed of a UV-curable or thermosetting resin into the second housing portion 1 m, it is possible to obtain a rotation detecting device A is excellent in anti-aqueous.

本発明の実施形態による回転検出装置を示す断面図。Sectional drawing which shows the rotation detection apparatus by embodiment of this invention. 同実施形態による回転検出装置の各構成部品を分解して示す断面図。Sectional drawing which decomposes | disassembles and shows each component of the rotation detection apparatus by the embodiment.

符号の説明Explanation of symbols

Ａ 回転検出装置
１ ハウジング
１ａ 基部（筒状部）
１ｂ 上端部
１ｄ 下端部
１ｅ 環状壁部
１ｆ 収納部（凹部）
１ｉ 空洞部（第１の収納部）
１ｊ 環状溝部
１ｍ 空間部（第２の収納部）
２ シャフト部材
２ａ ベース部（円筒部）
２ｃ 第１の凹部
２ｄ 第２の凹部
２ｆ 第１の載置面（段差部）
２ｉ 環状凹部
２ｋ 環状平坦面
３ 磁力発生部材（磁石）
４ 磁気変換素子
５ 回路基板
６ 磁性部材
７ 硬化樹脂
１０ Ｏリング
１１ 座金
Ｌ 回転中心軸 A Rotation detection device 1 Housing 1a Base (tubular portion)
1b upper end 1d lower end 1e annular wall 1f storage (recess)
1i Cavity (first storage part)
1j Annular groove 1m Space part (second storage part)
2 Shaft member 2a Base part (cylindrical part)
2c 1st recessed part 2d 2nd recessed part 2f 1st mounting surface (step part)
2i Annular recess 2k Annular flat surface 3 Magnetic force generating member (magnet)
4 Magnetic conversion element 5 Circuit board 6 Magnetic member 7 Cured resin 10 O-ring 11 Washer L Rotation center axis

Claims (3)

回転体の回転を受けて回転するシャフト部材に磁石を配設し、前記磁石の回転による磁力変化を磁気変換素子により検出する回転検出装置であって、前記シャフト部材を回転可能に配設する第１の収納部と、前記磁気変換素子を回路基板を介して配設する第２の収納部とを互いに連通しないように一体にハウジングに設け、前記シャフト部材に段差部を設け、前記段差部に座金を配設し、前記第１の収納部の上端部の少なくとも一部分を前記座金方向にかしめることで、前記第１の収納部に対して前記シャフト部材をスラスト規制してなることを特徴とする回転検出装置。 A rotation detecting device that disposes a magnet on a shaft member that rotates in response to the rotation of a rotating body, and detects a change in magnetic force due to the rotation of the magnet by a magnetic conversion element, wherein the shaft member is rotatably disposed. 1 housing part and the second housing part in which the magnetic conversion element is disposed via the circuit board are integrally provided in the housing so as not to communicate with each other , the shaft member is provided with a step part, and the step part is provided with The shaft member is thrust-regulated with respect to the first storage portion by disposing a washer and caulking at least a part of the upper end portion of the first storage portion in the direction of the washer. Rotation detection device. 前記第２の収納部は、前記磁気変換素子を収納する凹部を備えてなることを特徴とする請求項１に記載の回転検出装置。 The rotation detection device according to claim 1, wherein the second storage portion includes a concave portion that stores the magnetic conversion element. 前記第２の収納部に硬化樹脂が充填されてなることを特徴とする請求項１に記載の回転検出装置。

The rotation detection device according to claim 1, wherein the second storage portion is filled with a cured resin.

JP2007020235A 2007-01-31 2007-01-31 Rotation detector Active JP4941824B2 (en)

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