JP7173032B2

JP7173032B2 - Rotation angle detector

Info

Publication number: JP7173032B2
Application number: JP2019549959A
Authority: JP
Inventors: 佑貴須山; 紀雄鈴木
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2017-10-24
Filing date: 2018-09-25
Publication date: 2022-11-16
Anticipated expiration: 2038-09-25
Also published as: JPWO2019082576A1; WO2019082576A1

Description

本発明は回転角度検出装置に関する。 The present invention relates to a rotation angle detection device.

回転軸の回転角度を検出する回転角度検出装置として、例えば、特許文献１に開示されたものがある。
この回転角度検出装置は、磁石が取り付けられる磁石保持部材と、磁石と対向し、磁石の回転に伴う磁界の変化を検出する磁気検出手段を備えるハウジングと、を備えて構成されている。磁石保持部材に被検出体の回転軸が連結され、磁石保持部材は、外周面がハウジングの内周面で支持された状態で回転可能となっている。2. Description of the Related Art For example, Patent Document 1 discloses a rotation angle detection device that detects the rotation angle of a rotating shaft.
This rotation angle detection device includes a magnet holding member to which a magnet is attached, and a housing facing the magnet and provided with magnetic detection means for detecting a change in magnetic field accompanying rotation of the magnet. The rotating shaft of the object to be detected is connected to the magnet holding member, and the magnet holding member is rotatable while its outer peripheral surface is supported by the inner peripheral surface of the housing.

特開２０１０－１６９６５２号公報JP 2010-169652 A

この特許文献１に開示された回転角度検出装置では、例えば船舶の船外機用のトリムチルト角度の検出を行う場合のように、被検出体の回転軸の偏心（中心軸が傾く）が大きい場合や回転軸のスラスト方向（軸方向）のガタつきが大きい場合には、円滑な回転が確保できず、磁石保持部材や磁石保持部材を支持するハウジングに大きな力が加わり、破損に至る虞がある。 In the rotation angle detection device disclosed in Patent Document 1, when the eccentricity of the rotation axis of the object to be detected (the center axis is tilted) is large, as in the case of detecting the trim tilt angle for an outboard motor of a ship, for example, If the rattling in the thrust direction (axial direction) of the rotating shaft is large, smooth rotation cannot be ensured, and a large force is applied to the magnet holding member and the housing that supports the magnet holding member, which may lead to damage. .

本発明は、上記問題点に鑑みてなされたものであり、磁石保持部材やハウジングの損傷を防止して安定した状態で回転角度を検出することができる回転角度検出装置を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotation angle detection device capable of stably detecting a rotation angle while preventing damage to a magnet holding member and a housing. do.

上記目的を達成するため、本発明に係る回転角度検出装置は、
磁界の変化を検出する磁気検出手段に対して回転する磁石と、
被検出体が連結されて回転し、前記磁石が取り付けられる柱状の磁石保持部材と、を有する磁石ユニットと、
前記磁石保持部材を収容するとともに、前記磁石と対向する前記磁気検出手段が設けられるハウジングと、を有する回転角度検出装置であって、
前記ハウジングは、前記磁石保持部材を収容する、開口部を有して内径が前記磁石保持部材の外径より大きい底付き円筒状の収容部を備える、
ことを特徴とする。In order to achieve the above object, a rotation angle detection device according to the present invention includes:
a magnet rotating with respect to the magnetic sensing means for sensing changes in the magnetic field;
a magnet unit having a columnar magnet holding member to which an object to be detected rotates and to which the magnet is attached;
a rotation angle detection device including a housing that accommodates the magnet holding member and in which the magnetism detection means that faces the magnet is provided,
The housing includes a bottomed cylindrical containing portion having an opening and an inner diameter larger than the outer diameter of the magnet holding member, which contains the magnet holding member.
It is characterized by

本発明によれば、磁石保持部材やハウジングの損傷を防止して安定した状態で回転角度を検出することができる。 According to the present invention, the rotation angle can be detected in a stable state while preventing damage to the magnet holding member and the housing.

本発明の回転角度検出装置一実施の形態を示す図２中のＹ－Ｙ断面図である。3 is a cross-sectional view taken along the line YY in FIG. 2, showing an embodiment of the rotation angle detection device of the present invention; FIG. 本発明の一実施の形態の正面図である。1 is a front view of one embodiment of the present invention; FIG. 本発明の一実施の形態の磁石ユニットを分解した状態の部分断面図である。FIG. 4 is a partial cross-sectional view of an exploded magnet unit according to one embodiment of the present invention; 本発明の一実施の形態のスラスト方向の移動状態を示す部分断面図である。FIG. 4 is a partial cross-sectional view showing a state of movement in the thrust direction according to one embodiment of the present invention; 本発明の一実施の形態の偏心状態を示す部分断面図である。It is a partial sectional view showing an eccentric state of one embodiment of the present invention.

以下に、本発明の一実施の形態に係る回転角度検出装置を添付図面に基づいて説明する。
回転角度検出装置１は、図１～図３に示すように、磁石１０と、磁石保持部材２０と、を有する磁石ユニット３０と、ハウジング４０と、磁気検出手段５０と、回路基板６０と、を備えて構成される。
本実施の形態に係る回転角度検出装置１は、例えば船舶の船外機用のトリムチルト角度の検出等に用いられ、被検出体である回転軸Ｌの振れ角度（偏心）が大きい場合や偏心に加えてスラスト方向（軸方向）のガタつきが大きい場合の回転軸Ｌの角度検出に用いて好適なものである。A rotation angle detection device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the rotation angle detection device 1 includes a magnet unit 30 having a magnet 10 and a magnet holding member 20, a housing 40, a magnetic detection means 50, and a circuit board 60. configured with.
The rotation angle detection device 1 according to the present embodiment is used, for example, to detect a trim tilt angle for an outboard motor of a ship. In addition, it is suitable for use in detecting the angle of the rotation axis L when there is large rattling in the thrust direction (axial direction).

磁石ユニット３０は、磁石１０と、磁石保持部材２０と、で構成される。
磁石１０は、磁界の変化を検出する磁気検出手段５０に対して回転する。
磁石１０は、例えばＳｍＣｏ（Samarium-Cobalt）からなり、略円柱形状をなしている。磁石１０は、磁石保持部材２０に取り付けられて円柱の中心軸を中心に回転される。磁石１０の回転にともなう磁界の変化が、後述するハウジング４０に取り付けられて磁石１０と対向する磁気検出手段５０で検出される。
磁石１０は、２つの磁極がその中心軸方向に直交する方向に並ぶ形で着磁されている。The magnet unit 30 is composed of the magnet 10 and the magnet holding member 20 .
The magnet 10 rotates with respect to magnetic detection means 50 which detect changes in the magnetic field.
The magnet 10 is made of SmCo (Samarium-Cobalt), for example, and has a substantially cylindrical shape. The magnet 10 is attached to the magnet holding member 20 and rotated around the central axis of the cylinder. A change in the magnetic field caused by the rotation of the magnet 10 is detected by the magnetic detection means 50 attached to the housing 40 and facing the magnet 10, which will be described later.
The magnet 10 is magnetized such that two magnetic poles are aligned in a direction perpendicular to its central axis.

磁石保持部材２０は、被検出体（回転軸）Ｌが連結されて回転し、磁石１０が取り付けられる柱状に形成される。磁石保持部材２０は、ポリブチレンテレフタレート等の熱可塑性樹脂から形成されており、２つの円筒部２１，２２が仕切部２３を挟んで円筒の中心軸方向に一体に連結されて形成されている。先端部（図１の右側の部分）の円筒部２１は、先端側が開口し、仕切部２３を底とした底付き円筒状とされ、磁石１０が収容される磁石取付部２１ａを構成する。基端部（図１の左側の部分）の円筒部２２は、円筒部２１とは逆側の基端側が開口し、仕切部２３を底とした底付き円筒状とされ、被検出体である回転軸Ｌが嵌合連結される連結部２２ａを構成する。
磁石保持部材２０では、基端側の連結部２２ａを構成する円筒部２２の肉厚Ｔが、先端側の磁石取付部２１ａを構成する円筒部２１の肉厚ｔよりも厚く形成してある。
なお、本実施の形態では、磁石保持部材２０は、基端部の円筒部２２の外径ｄ２が大きく、先端部の円筒部２１の外径ｄ１が小さい２段円筒状の外形状に形成されている。したがって、基端部の円筒部２２は、外径ｄ２が大きく、しかも円筒側壁の厚さＴが厚く形成され、先端部の円筒部２１は、外径ｄ１が小さく、円筒側壁の厚さｔが薄く形成された２段円筒状の外形とされている。
これにより、被検出体である回転軸Ｌを連結部２２ａに挿入して嵌合連結する場合の連結強度を高め磁石保持部材２０から回転軸Ｌが抜け落ちることを防止する。また、回転軸Ｌの嵌合部Ｌａに連結される磁石保持部材２０の先端側の重量を基端側に比べて相対的に小さくすることで、回転軸Ｌの先端の振れを抑えるようにし、一層確実に嵌合連結状態を保持できるようにしてある。The magnet holding member 20 is formed in a columnar shape to which the object to be detected (rotating shaft) L is connected and rotated, and to which the magnet 10 is attached. The magnet holding member 20 is formed of a thermoplastic resin such as polybutylene terephthalate, and is formed by connecting two cylindrical portions 21 and 22 integrally in the central axis direction of the cylinder with a partition portion 23 interposed therebetween. The cylindrical portion 21 at the tip portion (the portion on the right side in FIG. 1) is open at the tip side, has a bottomed cylindrical shape with the partition portion 23 as the bottom, and constitutes a magnet attachment portion 21a in which the magnet 10 is accommodated. The cylindrical portion 22 at the proximal end portion (the left portion in FIG. 1) is open at the proximal end side opposite to the cylindrical portion 21, and has a bottomed cylindrical shape with the partition portion 23 as the bottom, and is an object to be detected. A connection portion 22a to which the rotating shaft L is fitted and connected is configured.
In the magnet holding member 20, the thickness T of the cylindrical portion 22 forming the connection portion 22a on the base end side is formed to be greater than the thickness t of the cylindrical portion 21 forming the magnet mounting portion 21a on the distal end side.
In this embodiment, the magnet holding member 20 is formed in a two-stage cylindrical outer shape in which the outer diameter d2 of the cylindrical portion 22 at the proximal end is large and the outer diameter d1 of the cylindrical portion 21 at the distal end is small. ing. Therefore, the cylindrical portion 22 at the proximal end has a large outer diameter d2 and a thick cylindrical side wall T, and the cylindrical portion 21 at the distal end has a small outer diameter d1 and a thick cylindrical side wall t. It has a thin two-stage cylindrical outer shape.
As a result, the connection strength is increased when the rotating shaft L, which is the object to be detected, is inserted into the connecting portion 22a and is fitted and connected, and the rotating shaft L is prevented from falling out of the magnet holding member 20. FIG. Also, by making the weight of the magnet holding member 20 connected to the fitting portion La of the rotating shaft L relatively smaller on the tip side than on the base end side, the deflection of the tip of the rotating shaft L is suppressed. The fitting connection state can be maintained more reliably.

なお、磁石保持部材２０の外形状は、先端部の円筒部２１の外径ｄ１が小さく、基端部の円筒部２２の外径ｄ２を大きくする場合に限らず、回転軸Ｌの直径や磁石１０の直径などにより適宜設定すれば良く、円筒部２１の肉厚ｔに比べて円筒部２２の肉厚Ｔを厚くすることで、回転軸Ｌの先端の振れを抑えるようにすれば良く、連結が確実にできれば良い。
また、磁石保持部材２０は、例えば、磁石１０がインサート成形法を利用して固定され、作製される。具体的には、金型内に磁石１０を配置して保持ピンなどで保持した状態で金型内に樹脂材料を流し込み、硬化させることにより磁石１０が固定された磁石保持部材２０を得る。The outer shape of the magnet holding member 20 is not limited to the case where the outer diameter d1 of the cylindrical portion 21 at the distal end is small and the outer diameter d2 of the cylindrical portion 22 at the base end is large. 10, and the thickness T of the cylindrical portion 22 is made thicker than the thickness t of the cylindrical portion 21 so as to suppress the deflection of the tip of the rotating shaft L. It would be nice if it could be done reliably.
Also, the magnet holding member 20 is manufactured by fixing the magnet 10 using an insert molding method, for example. Specifically, the magnet holding member 20 having the magnets 10 fixed thereto is obtained by pouring a resin material into the mold while the magnets 10 are placed in the mold and held by a holding pin or the like and hardened.

磁石保持部材２０は、先端部に磁石１０の先端面１０ａより突き出して収容部４４の底面４４ｂと対向する凸状ガイド部２１ｂを備える。凸状ガイド部２１ｂは、円筒部２１の先端部に、磁石１０の先端面１０ａより突き出して形成される。凸状ガイド部２１ｂは、図１に示すように、円筒部２１の磁石取付部２１ａの高さＢ（先端から仕切部２３までの距離）に対し、磁石１０の厚さを小さくすることで形成される環状の突出部であり、円筒部２１の先端外周に一体に形成される。すなわち、磁石保持部材２０において、円筒部２１の外周面の高さＢ１は、凸状ガイド部２１ｂの内周面の高さｂよりも高く形成されている。
このような凸状ガイド部２１ｂを設けることで、後述するハウジング４０に収容されて回転する磁石保持部材２０の磁石１０がハウジング４０に接触することを防止し、凸状ガイド部２１ｂを接触させることで、磁石保持部材２０や磁石１０の損傷を防止できるようにしている。
なお、凸状ガイド部２１ｂは、環状に突き出して形成する場合に限らず、円周方向に分割して形成するようにしても良く、分割して形成する場合には、回転バランスを保つことができるように配置する。The magnet holding member 20 is provided with a convex guide portion 21b at its tip portion, which protrudes from the tip end surface 10a of the magnet 10 and faces the bottom surface 44b of the accommodating portion 44. As shown in FIG. The convex guide portion 21 b is formed at the distal end portion of the cylindrical portion 21 so as to protrude from the distal end surface 10 a of the magnet 10 . As shown in FIG. 1, the convex guide portion 21b is formed by reducing the thickness of the magnet 10 with respect to the height B (the distance from the tip to the partition portion 23) of the magnet mounting portion 21a of the cylindrical portion 21. It is an annular projecting portion formed integrally with the outer circumference of the tip of the cylindrical portion 21 . That is, in the magnet holding member 20, the height B1 of the outer peripheral surface of the cylindrical portion 21 is formed higher than the height b of the inner peripheral surface of the convex guide portion 21b.
By providing such a convex guide portion 21b, the magnet 10 of the magnet holding member 20, which is housed in a housing 40 to be described later and rotates, is prevented from coming into contact with the housing 40, and the convex guide portion 21b is brought into contact with the housing 40. Thus, damage to the magnet holding member 20 and the magnet 10 can be prevented.
In addition, the convex guide portion 21b is not limited to the case where it protrudes in an annular shape, and may be formed by dividing it in the circumferential direction. Place it so that you can.

磁石保持部材２０の連結部２２ａは、回転軸Ｌを嵌合して板ばね７０で押えて連結するための凹部である。
嵌合連結される回転軸Ｌは、図３に示すように、嵌合部Ｌａが円柱の側面の一部を中心軸と平行に平坦に切り欠いた略かまぼこ状の横断面形状に形成されている。
連結部２２ａは、図２に示すように、回転軸Ｌの嵌合部Ｌａの横断面形状に合わせた略かまぼこ状の横断面形状の凹部に形成されており、連結部２２ａの基端面には、平面部と平行に板ばね装着溝２２ｂ（図１，図３参照）が形成されている。
板ばね７０は、図１などに示すように、ばね材を略Ｕ字状に折り曲げて形成されており、Ｕ字状の一方に略平坦な固定片７０ａが形成され、他方に略Ｓ字状に湾曲して突き出す押え片７０ｂと、先端のストッパ片７０ｃとが形成されている。
板ばね７０は、板ばね装着溝２２ｂに板ばね７０の一方の固定片７０ａが開口側から挿入され、他方の湾曲した押え片７０ｂが連結部２２ａの内側に突き出すように連結部２２ａに取り付けられ、ストッパ片７０ｃも連結部２２ａの内側に突き出すようになっている。
板ばね７０が取り付けられた磁石保持部材２０の連結部２２ａには、被検出体である回転軸Ｌの嵌合部Ｌａが嵌合され、押え片７０ｂによって回転軸Ｌの中心軸と直交する方向（ラジアル方向）の動きが押えられるとともに、嵌合部Ｌａの先端がストッパ片７０ｃに当たることで所定の深さまで回転軸Ｌの嵌合部Ｌａが挿入され、回転軸Ｌの中心軸方向（スラスト方向）の動きが押えられ，強固に嵌合連結状態が保持される。
また、被検出体である回転軸Ｌと、回転軸Ｌの連結部２２ａとが同一の横断面形状としてあるので、回転軸Ｌと磁石保持部材２０は、一体として回転する。The connecting portion 22a of the magnet holding member 20 is a concave portion for fitting the rotating shaft L and pressing it with the plate spring 70 for connecting.
As shown in FIG. 3, the rotating shaft L to be fitted and connected is formed in a substantially semicylindrical cross-sectional shape in which the fitting part La is flatly notched in parallel with the central axis of a part of the side surface of the cylinder. there is
As shown in FIG. 2, the connecting portion 22a is formed in a recess having a substantially semicylindrical cross-sectional shape that matches the cross-sectional shape of the fitting portion La of the rotation shaft L. A plate spring mounting groove 22b (see FIGS. 1 and 3) is formed in parallel with the plane portion.
The leaf spring 70 is formed by bending a spring material into a substantially U shape, as shown in FIG. A pressing piece 70b that curves and protrudes and a stopper piece 70c at the tip are formed.
The leaf spring 70 is attached to the connecting portion 22a so that one fixed piece 70a of the leaf spring 70 is inserted into the leaf spring mounting groove 22b from the opening side, and the other curved pressing piece 70b protrudes inside the connecting portion 22a. , the stopper piece 70c also protrudes inside the connecting portion 22a.
The connecting portion 22a of the magnet holding member 20 to which the plate spring 70 is attached is fitted with the fitting portion La of the rotating shaft L, which is an object to be detected. (Radial direction) movement is suppressed, and the tip of the fitting portion La hits the stopper piece 70c, so that the fitting portion La of the rotating shaft L is inserted to a predetermined depth, and the central axis direction (thrust direction) of the rotating shaft L is inserted. ) is restrained, and the fitted and connected state is firmly maintained.
In addition, since the rotating shaft L, which is an object to be detected, and the connecting portion 22a of the rotating shaft L have the same cross-sectional shape, the rotating shaft L and the magnet holding member 20 rotate together.

ハウジング４０は、磁石１０と、磁石保持部材２０と、を有する磁石ユニット３０、磁気検出手段５０、および回路基板６０などを収容する。
ハウジング４０は、図２で示すＹ－Ｙ線の断面形状が略Ｌ字状に形成されており、ポリブチレンテレフタレート等の熱可塑性の樹脂材料を用いて形成される。
ハウジング４０は、被検出体である回転軸Ｌ側に突き出す略円筒状の第１本体部４１と、回転軸Ｌ側と反対側に第１本体部４１と直交して配置された略かまぼこ状の第２本体部４２と、第１本体部４１の中間部の略ひし形状とされて両側に突き出す固定部４３（図２参照）と、が一体に形成されて構成されている。The housing 40 accommodates the magnet unit 30 having the magnet 10 and the magnet holding member 20, the magnetism detection means 50, the circuit board 60, and the like.
The housing 40 has a substantially L-shaped cross section taken along line YY shown in FIG. 2, and is made of a thermoplastic resin material such as polybutylene terephthalate.
The housing 40 includes a substantially cylindrical first body portion 41 protruding toward the rotation axis L side, which is an object to be detected, and a substantially semicylindrical shape disposed orthogonally to the first body portion 41 on the side opposite to the rotation axis L side. The second main body portion 42 and the fixing portion 43 (see FIG. 2) which is substantially diamond-shaped and protrudes to both sides in the intermediate portion of the first main body portion 41 are integrally formed.

回転軸Ｌ側の略円筒状の第１本体部４１には、回転軸Ｌの連結基端側（図１，図３～図５の紙面左側）に開口部４４ａを有して内径Ｄ１（Ｄ２）が磁石保持部材２０の外径ｄ１（ｄ２）より大きい底付き円筒状の収容部４４が形成されている。収容部４４には、円筒の中心軸と同軸上に回転軸Ｌが嵌合連結された磁石保持部材２０が配置される。
これにより、収容部４４に収容される磁石保持部材２０は、外径ｄ１（ｄ２）と、収容部４４の内径Ｄ１（Ｄ２）との間に隙間が形成された状態で収容される。The substantially cylindrical first main body portion 41 on the side of the rotation axis L has an opening 44a on the connection base end side of the rotation axis L (the left side of the paper surface of FIGS. 1 and 3 to 5) and has an inner diameter D1 (D2 ) larger than the outer diameter d1 (d2) of the magnet holding member 20 is formed. In the accommodation portion 44, the magnet holding member 20 is arranged which is coaxial with the central axis of the cylinder and has the rotating shaft L fitted thereon.
As a result, the magnet holding member 20 accommodated in the accommodation portion 44 is accommodated with a gap formed between the outer diameter d1 (d2) and the inner diameter D1 (D2) of the accommodation portion 44 .

ハウジング４０の収容部４４に収容される磁石ユニット（磁石１０及び磁石保持部材２０）３０は、これまでの回転角度検出装置１での収容部４４の内周と接する状態で磁石保持部材２０が配置されて回転角度を検出するものとは、異なる構成となっている。また、磁石保持部材２０は、ハウジング４０の収容部４４の開口部４４ａに抜け止め金具などで抜け止めが施されていない構成でも相違している。 The magnet unit (magnet 10 and magnet holding member 20) 30 housed in the housing portion 44 of the housing 40 has the magnet holding member 20 arranged in contact with the inner periphery of the housing portion 44 in the conventional rotation angle detection device 1. It has a different configuration from the one that detects the rotation angle by being turned on. The magnet holding member 20 is also different in that the opening 44a of the accommodating portion 44 of the housing 40 is not retained by a retainer fitting or the like.

この内外周間の隙間は、被検出体である回転軸Ｌが連結部２２ａに嵌合連結される磁石保持部材２０と、磁石保持部材２０を覆うように被検出体側などに固定部４３を介して固定されるハウジング４０の固定位置の設定によって確保される。
本実施の形態では、収容部４４は円筒状に形成されて一定の内径Ｄ１とされ、開口部４４ａは，開口端に向かって広がる２段の円筒部として形成され、開口端の最大となる内径がＤ２としてある。一方、磁石保持部材２０は、磁石１０が取り付けられる円筒部２１の外径が小径のｄ１とされ、回転軸Ｌの連結部２２ａとなる円筒部２２の外径が大径のｄ２としてあるが、磁石保持部材２０のいずれの部分が収容部４４に位置しても外径ｄ１，ｄ２と内径Ｄ１，Ｄ２との間に隙間が形成されるように設定してある。
このような収容部４４に対して磁石保持部材２０を相対的に小さくして隙間を設けることにより、図５に磁石保持部材２０の偏心状態を示すように、被検出体である回転軸Ｌが傾いて偏心したり、振れ回ることがあっても磁石保持部材２０とハウジング４０とが干渉せず、損傷を防止することができる。
したがって、被検出体である回転軸Ｌの許容される傾き角度や偏心量に応じて磁石保持部材２０の外径ｄ１，ｄ２や収容部４４の内径Ｄ１，Ｄ２が定められる。The gap between the inner and outer peripheries is defined by the magnet holding member 20 to which the rotating shaft L, which is the object to be detected, is fitted and connected to the connecting portion 22a, and the fixing portion 43 on the side of the object to be detected so as to cover the magnet holding member 20. This is ensured by the fixed position setting of the housing 40, which is fixed by
In this embodiment, the housing portion 44 is formed in a cylindrical shape and has a constant inner diameter D1, and the opening portion 44a is formed as a two-stage cylindrical portion that widens toward the opening end, and has the largest inner diameter at the opening end. is D2. On the other hand, in the magnet holding member 20, the cylindrical portion 21 to which the magnet 10 is attached has a small outer diameter d1, and the cylindrical portion 22 serving as the connecting portion 22a of the rotating shaft L has a large outer diameter d2. A gap is formed between the outer diameters d1 and d2 and the inner diameters D1 and D2 regardless of which part of the magnet holding member 20 is positioned in the accommodating portion 44 .
By making the magnet holding member 20 relatively small with respect to the accommodating portion 44 and providing a gap, as shown in FIG. The magnet holding member 20 and the housing 40 do not interfere with each other even if they are tilted, eccentric, or swayed, so that damage can be prevented.
Therefore, the outer diameters d1 and d2 of the magnet holding member 20 and the inner diameters D1 and D2 of the accommodating portion 44 are determined according to the allowable inclination angle and eccentricity of the rotating shaft L, which is the object to be detected.

なお、収容部４４の底面４４ｂと磁石保持部材２０の先端の凸状ガイド部２１ｂとの間には、これまでと同様に、隙間が設けられており、被検出体である回転軸Ｌにスラスト方向（軸方向）のガタつきが生じても磁石保持部材２０とハウジング４０とが干渉せず、損傷を防止することができるようにしてある。
すなわち、図４に示すように、回転軸Ｌのスラスト方向の移動によるガタつきにより、磁石保持部材２０と収容部４４の底面４４ｂとの隙間が変化して大きくなった場合や、隙間が小さくなった場合（図示せず）のいずれでも何ら支障なく磁石保持部材２０の収容部４４内での回転が確保されるようにしてある。
また、磁石保持部材２０の先端に凸状ガイド部２１ｂが設けてあるので、既述したように、ハウジング４０に収容されて回転する磁石保持部材２０の磁石１０の先端面１０ａがハウジング４０に接触することを防止し、先に凸状ガイド部２１ｂを接触させることで、磁石保持部材２０や磁石１０の損傷を防止できるようにしている。A gap is provided between the bottom surface 44b of the housing portion 44 and the convex guide portion 21b at the tip of the magnet holding member 20, as in the above, so that the rotating shaft L, which is the object to be detected, is thrust. The magnet holding member 20 and the housing 40 do not interfere with each other even if rattling occurs in the direction (axial direction), thereby preventing damage.
That is, as shown in FIG. 4, when the gap between the magnet holding member 20 and the bottom surface 44b of the housing portion 44 changes and becomes larger due to rattling caused by movement of the rotating shaft L in the thrust direction, the gap becomes smaller. In either case (not shown), the rotation of the magnet holding member 20 within the accommodating portion 44 is ensured without any trouble.
Further, since the convex guide portion 21b is provided at the tip of the magnet holding member 20, the tip surface 10a of the magnet 10 of the magnet holding member 20, which is housed in the housing 40 and rotates, comes into contact with the housing 40 as described above. By first contacting the convex guide portion 21b, damage to the magnet holding member 20 and the magnet 10 can be prevented.

ハウジング４０は、第１本体部４１の収容部４４の底面４４ｂを挟んで回転軸Ｌ側と反対側（図１，図３～図５の紙面右側）に、第１本体部４１と直交して略かまぼこ状の第２本体部４２が設けられており、第２本体部４２に、磁気検出手段５０や回路基板６０等の回転角度検出装置１の構成部品を収容する第２収容部４５が設けられている。
第２収容部４５は、回転軸Ｌ側と反対側が開口した凹部として形成されている。第２収容部４５には、収容部４４の底面４４ｂを挟んで磁石１０と対向する位置に、回路基板６０に実装した磁気検出手段５０が収容される。これにより、第１本体部４１の収容部４４に収容された磁石保持部材２０の磁石１０と、第２本体部４２の第２収容部４５に収容された磁気検出手段５０の磁気検出素子５１と、が対向するように配置され、磁石１０の回転にともなう磁界の変化を検出する。The housing 40 is provided on the side opposite to the rotation axis L side across the bottom surface 44b of the housing portion 44 of the first main body portion 41 (the right side of the paper surface of FIGS. 1 and 3 to 5), perpendicular to the first main body portion 41. A substantially semicylindrical second body portion 42 is provided, and the second body portion 42 is provided with a second housing portion 45 for housing components of the rotation angle detection device 1 such as the magnetic detection means 50 and the circuit board 60 . It is
The second housing portion 45 is formed as a concave portion that is open on the side opposite to the rotation axis L side. The magnetic detection means 50 mounted on the circuit board 60 is accommodated in the second accommodating portion 45 at a position facing the magnet 10 with the bottom surface 44 b of the accommodating portion 44 interposed therebetween. As a result, the magnet 10 of the magnet holding member 20 accommodated in the accommodating portion 44 of the first main body portion 41 and the magnetic detecting element 51 of the magnetic detecting means 50 accommodated in the second accommodating portion 45 of the second main body portion 42 are separated. , are arranged to face each other, and detect changes in the magnetic field caused by the rotation of the magnet 10 .

ハウジング４０の第２本体部４２の一端部（図１～図３の紙面下端部）には、検出される回転角度を外部に出力するコネクタ部４６が設けられ、コネクタ部４６の凹部内に出力用導体６６がハウジング４０に固定配置されている。コネクタ部４６に外部機器のプラグ（図示せず）を接続することで、出力用導体６６とプラグとが電気的に接続され、回転角度の検出信号を外部に取り出すことができる。
ハウジング４０の第２収容部４５への磁気検出手段５０や回路基板６０などの構成部品の収容については、構成部品とともに、後述する。A connector portion 46 for outputting the detected rotation angle to the outside is provided at one end of the second main body portion 42 of the housing 40 (lower end of the paper surface of FIGS. 1 to 3), and is output into the concave portion of the connector portion 46. A conductor 66 is fixedly disposed on the housing 40 . By connecting a plug (not shown) of an external device to the connector portion 46, the output conductor 66 and the plug are electrically connected, and a rotation angle detection signal can be output to the outside.
The accommodation of components such as the magnetic detection means 50 and the circuit board 60 in the second accommodation portion 45 of the housing 40 will be described later together with the components.

ハウジング４０の収容部４４は、収容部４４の底面４４ｂに位置し、凸状ガイド部２１ｂの内径ｄ３より小さい外径Ｄ３で突き出して磁石１０に磁気検出手段５０を近づける柱状の凸部４４ｃを備える（図１参照）。凸部４４ｃには、第２収容部４５側から凹部が形成され、凸部４４ｃの凹部と対向して磁気検出手段５０の磁気検出素子５１を配置する。凸部４４ｃの凹部は、磁気検出素子５１を保護する封止部材４７の充填空間とされる。すなわち、磁気検出素子５１の表面の検出面５１ａと凸部４４ｃの凹部内には、ハウジング４０の熱膨張などによる磁気検出素子５１の破損などを防止する封止部材４７が充填される。
封止部材４７の充填は、後述する第２収容部４５に充填する封止部材４７（図１参照）が回り込むことで充填される。
これにより、封止部材４７の充填空間を凸部４４ｃによって確保し、磁気検出手段５０の磁気検出素子５１の検出面５１ａと磁石１０の先端面１０ａとを対向させて近づけることが可能となり、磁気検出素子５１による磁石１０の回転にともなう磁界の変化を強めて検出でき、検出精度を高めることができる。 The accommodating portion 44 of the housing 40 is located on the bottom surface 44b of the accommodating portion 44 and has a columnar convex portion 44c that protrudes with an outer diameter D3 smaller than the inner diameter d3 of the convex guide portion 21b to allow the magnetic detecting means 50 to approach the magnet 10. (See Figure 1). A concave portion is formed in the convex portion 44c from the second accommodating portion 45 side, and the magnetic detecting element 51 of the magnetic detecting means 50 is arranged facing the concave portion of the convex portion 44c. A concave portion of the convex portion 44 c is used as a filling space for a sealing member 47 that protects the magnetic detecting element 51 . That is, the detection surface 51a of the surface of the magnetic detection element 51 and the recesses of the protrusions 44c are filled with a sealing member 47 that prevents the magnetic detection element 51 from being damaged due to thermal expansion of the housing 40 or the like.
The filling of the sealing member 47 is carried out by wrapping around the sealing member 47 (see FIG. 1) to be filled in the second housing portion 45, which will be described later.
As a result, the filling space of the sealing member 47 is ensured by the convex portion 44c, and the detection surface 51a of the magnetic detection element 51 of the magnetic detection means 50 and the tip surface 10a of the magnet 10 can be brought closer to each other. It is possible to intensify and detect changes in the magnetic field caused by the rotation of the magnet 10 by the detection element 51, thereby improving the detection accuracy.

一方、回転する磁石保持部材２０と凸部４４ｃとが接近することで、回転軸Ｌの偏心や振れなどで、磁石保持部材２０の凸状ガイド部２１ｂと凸部４４ｃとが干渉する虞が生じる。
これを防止するため、図３に示すように、収容部４４は、内径Ｄ１，Ｄ２と磁石保持部材２０の外径ｄ１，ｄ２との寸法差Ｃ１（＝Ｄ１（Ｄ２）－ｄ１（ｄ２））（図示せず）より、凸状ガイド部２１ｂの内径ｄ３と凸部４４ｃの外径Ｄ３との寸法差Ｃ２（＝ｄ３－Ｄ３）（図示せず）が大きく形成されている。
この収容部４４の内径Ｄ１（Ｄ２）と磁石保持部材の外径ｄ１（ｄ２）との寸法差Ｃ１よりも凸状ガイド部２１ｂの内径ｄ３と凸部４４ｃの外径Ｄ３との寸法差Ｃ２を大きくするとともに、既に説明したように、磁石保持部材２０において、円筒部２１の外周面の高さＢ１を、凸状ガイド部２１ｂの内周面の高さｂよりも高く形成することを組み合わせることによって、回転軸Ｌの偏心や振れなどで磁石保持部材２０が過剰に偏心しても磁石保持部材２０と収容部４４との寸法差Ｃ１が小さいので、凸状ガイド部２１ｂと凸部４４ｃとが干渉する前に磁石保持部材２０と収容部４４とが接触することになる。磁石保持部材２０の広い外周面と収容部４４の内周面とを先に接触させることで応力が分散され、磁石保持部材２０やハウジング４０の損傷を抑制することができる。On the other hand, when the rotating magnet holding member 20 and the convex portion 44c approach each other, the convex guide portion 21b of the magnet holding member 20 and the convex portion 44c may interfere with each other due to eccentricity or deflection of the rotation axis L. .
In order to prevent this, as shown in FIG. (not shown), the dimensional difference C2 (=d3-D3) (not shown) between the inner diameter d3 of the convex guide portion 21b and the outer diameter D3 of the convex portion 44c is formed large.
The dimensional difference C2 between the inner diameter d3 of the convex guide portion 21b and the outer diameter D3 of the convex portion 44c is calculated as follows: In addition to increasing the size, as already described, in the magnet holding member 20, the height B1 of the outer peripheral surface of the cylindrical portion 21 is formed higher than the height b of the inner peripheral surface of the convex guide portion 21b. Therefore, even if the magnet holding member 20 is excessively eccentric due to eccentricity or vibration of the rotating shaft L, the dimensional difference C1 between the magnet holding member 20 and the accommodating portion 44 is small, so that the convex guide portion 21b and the convex portion 44c interfere with each other. The magnet holding member 20 and the accommodation portion 44 are brought into contact with each other before the assembly. By bringing the wide outer peripheral surface of the magnet holding member 20 and the inner peripheral surface of the housing portion 44 into contact first, the stress is dispersed, and damage to the magnet holding member 20 and the housing 40 can be suppressed.

磁気検出手段５０は、ホールＩＣ（Integrated Circuit）やＭＲ(Magneto-Resistance)素子等の磁気検出素子５１が、合成樹脂等で形成されたパッケージ内部に収容されて構成されている。磁気検出素子５１は、磁石保持部材２０と連動して回転する磁石１０が回転することにより変化する磁界の強さに応じた検出信号を出力する。磁気検出素子５１の検出面５１ａは、回転軸Ｌに直交しており、磁石１０の先端面１０ａと対向した状態でハウジング４０の第２収容部４５に配置されている。また、磁気検出手段５０からは、パッケージ内に収納された磁気検出素子５１から出力される検出信号を取り出すためのリード部（図示せず）が延出している。
磁気検出手段５０は、他の電子部品等とともに、回路基板６０に実装される。The magnetic detection means 50 is configured by housing a magnetic detection element 51 such as a Hall IC (Integrated Circuit) or an MR (Magneto-Resistance) element in a package made of synthetic resin or the like. The magnetic detection element 51 outputs a detection signal corresponding to the strength of the magnetic field that changes due to the rotation of the magnet 10 that rotates in conjunction with the magnet holding member 20 . A detection surface 51 a of the magnetic detection element 51 is orthogonal to the rotation axis L and arranged in the second accommodating portion 45 of the housing 40 so as to face the tip surface 10 a of the magnet 10 . A lead portion (not shown) extends from the magnetic detection means 50 for extracting a detection signal output from the magnetic detection element 51 housed in the package.
The magnetic detection means 50 is mounted on the circuit board 60 together with other electronic components.

回路基板６０は、略長方形の板状に形成されている。回路基板６０は、ガラスエポキシ樹脂等の絶縁性材料による硬質の基板６１と、基板６１上に形成された導電パターン（図示せず）と、基板６１の厚さ方向に貫通する２種類の貫通孔６２及び貫通孔６３と、を有する。回路基板６０は、一方の面に磁気検出手段５０と図示しないコンデンサ等が配設されている。磁気検出手段５０のリード部（図示せず）は、回路基板６０に設けられた導電パターンに電気的に接続されている。貫通孔６２は金属で形成され、導電パターンと電気的に接続されたランド部６４が外周部に設けられている。貫通孔６３は、導電パターンと電気的に絶縁され、固定ピン６５が挿入されている。貫通孔６２には、出力用導体６６の一部が挿通される。なお、導電パターン及びランド部６４を形成する金属としては、例えば電気伝導度及び熱伝導度が高い銅等を採用することができる。また、回路基板６０は、図示しない、例えば周縁部に２つの係合凹部を有し、ハウジング４０に設けられる突出部に係合することで第２収容部４５に固定支持される。
なお、固定ピン６５は、回路基板６０をハウジング４０の第２収容部４５に位置決めし固定するためのものであり、出力用導体６６は、検出信号を外部に取り出すためのものであり、それぞれ複数設けられている。The circuit board 60 is formed in a substantially rectangular plate shape. The circuit board 60 includes a hard board 61 made of an insulating material such as glass epoxy resin, a conductive pattern (not shown) formed on the board 61, and two types of through-holes extending through the board 61 in the thickness direction. 62 and through holes 63 . The circuit board 60 has the magnetic detecting means 50 and a capacitor (not shown) arranged on one surface thereof. A lead portion (not shown) of the magnetic detection means 50 is electrically connected to a conductive pattern provided on the circuit board 60 . The through hole 62 is made of metal, and a land portion 64 electrically connected to the conductive pattern is provided on the outer peripheral portion. The through hole 63 is electrically insulated from the conductive pattern and has a fixing pin 65 inserted therein. A portion of the output conductor 66 is inserted through the through hole 62 . As the metal forming the conductive pattern and the land portion 64, for example, copper having high electrical conductivity and high thermal conductivity can be used. Further, the circuit board 60 has, for example, two engaging recesses (not shown) in its peripheral edge portion, and is fixedly supported by the second accommodating portion 45 by engaging with projections provided on the housing 40 .
The fixing pin 65 is for positioning and fixing the circuit board 60 to the second accommodating portion 45 of the housing 40, and the output conductor 66 is for extracting the detection signal to the outside. is provided.

出力用導体６６は、銅等の高い導電性能を有する金属の線材を曲げ加工して形成されており、出力端子部６６ａと、出力端子部６６ａに延設されて略コ字状に形成された中間部６６ｂと、中間部６６ｂに延設された接続端子部６６ｃとを備えている。出力用導体６６は、中間部６６ｂがハウジング４０に固定されるとともに、接続端子部６６ｃが回路基板６０の貫通孔６２に挿通されて半田付け電気的に接続され、出力端子部６６ａがハウジング４０のコネクタ部４６内に露出している。
これにより、出力用導体６６は、回路基板６０と電気的に接続され、磁気検出手段５０から出力される検出信号が出力用導体６６を介して伝送される。出力用導体６６は、３本設けられている。The output conductor 66 is formed by bending a metal wire having high conductivity such as copper. It has an intermediate portion 66b and a connection terminal portion 66c extending from the intermediate portion 66b. The intermediate portion 66b of the output conductor 66 is fixed to the housing 40, the connection terminal portion 66c is inserted into the through hole 62 of the circuit board 60 and electrically connected by soldering, and the output terminal portion 66a is connected to the housing 40. It is exposed inside the connector portion 46 .
As a result, the output conductor 66 is electrically connected to the circuit board 60 , and the detection signal output from the magnetic detection means 50 is transmitted via the output conductor 66 . Three output conductors 66 are provided.

第２収容部４５には、封止部材４７が充填されている。封止部材４７は、樹脂材料から形成され、第２収容部４５を満たしている。この樹脂材料としては、エポキシ樹脂やシリコーン等の熱硬化性樹脂を採用しても良いし、ＵＶ（Ultra Violet）硬化型樹脂であっても良い。封止部材４７により、磁気検出手段５０と回路基板６０とが外気に接触することが防止され、磁気検出手段５０及び回路基板６０の劣化を防止するとともに、設置環境の影響を回避することができる。 The second accommodation portion 45 is filled with a sealing member 47 . The sealing member 47 is made of a resin material and fills the second housing portion 45 . As this resin material, a thermosetting resin such as an epoxy resin or silicone may be employed, or a UV (Ultra Violet) curable resin may be used. The sealing member 47 prevents the magnetic detection means 50 and the circuit board 60 from coming into contact with the outside air, thereby preventing deterioration of the magnetic detection means 50 and the circuit board 60 and avoiding the influence of the installation environment. .

このように構成した回転角度検出装置１は、被検出体である回転軸Ｌの嵌合部Ｌａに磁石保持部材２０の連結部２２ａを、断面形状を合わせるようにして嵌合し、板ばね７０で嵌合連結状態を保持する。
この回転軸Ｌに連結された磁石保持部材２０を覆うようにハウジング４０の収容部４４を配置し、ハウジング４０の固定部４３を被検出体などに固定する。
このハウジング４０の収容部４４に磁石保持部材２０を収容した状態では、磁石保持部材２０の外周と、収容部４４の内周の間に所定の隙間が形成された状態とする。
こうして回転角度検出装置１を設置した後、必要に応じて回転軸Ｌの回転角度と検出信号との校正を行う。校正は、例えば、回転角度を０～９０度の範囲で変化させた場合に直線性を有する出力信号が得られることを確認する。
こうして準備が完了した後、回転角度検出装置１での回転軸Ｌの回転角度の検出が行われる。In the rotation angle detection device 1 configured as described above, the coupling portion 22a of the magnet holding member 20 is fitted to the fitting portion La of the rotating shaft L, which is an object to be detected, so as to match the cross-sectional shape thereof. to maintain the mated connection state.
The accommodating portion 44 of the housing 40 is arranged so as to cover the magnet holding member 20 connected to the rotating shaft L, and the fixing portion 43 of the housing 40 is fixed to the object to be detected.
When the magnet holding member 20 is accommodated in the accommodation portion 44 of the housing 40 , a predetermined gap is formed between the outer circumference of the magnet holding member 20 and the inner circumference of the accommodation portion 44 .
After the rotation angle detection device 1 is installed in this manner, the rotation angle of the rotation shaft L and the detection signal are calibrated as necessary. Calibration confirms that a linear output signal is obtained, for example, when the rotation angle is changed in the range of 0 to 90 degrees.
After the preparation is completed in this manner, the rotation angle of the rotation axis L is detected by the rotation angle detection device 1 .

磁石ユニット３０では、回転角度の検出中に、回転軸Ｌの偏心や振れ、あるいはスラスト方向のガタつきが生じても、回転軸Ｌが連結される磁石保持部材２０の連結部２２ａの肉厚Ｔを、先端の磁石取付部２１ａの肉厚ｔより厚くして強度を高めるとともに、回転軸Ｌの先端の重量を相対的に小さくしてあるので、回転バランスを保持することができるとともに、連結強度を高めることができ、回転軸Ｌが抜け落ちることを防止できる。これにより、被検出体である回転軸Ｌとの連結が確実にでき、安定した状態で回転角度を検出することができる。
また、磁石ユニット３０では、磁石保持部材２０の先端に凸状ガイド部２１ｂを設けて磁石１０の先端面１０ａより突き出すようにしてあるので、回転軸Ｌのスラスト方向のガタつきが生じても磁石１０が収容部４４の底面４４ｂと接触することが回避され、凸状ガイド部２１ｂが先に接触することで、例え接触が生じても磁石１０の損傷を防止して安定した状態で回転角度の検出を継続することができる。In the magnet unit 30, even if eccentricity or vibration of the rotation axis L or rattling in the thrust direction occurs during detection of the rotation angle, the thickness T of the connecting portion 22a of the magnet holding member 20 to which the rotation axis L is connected is is thicker than the wall thickness t of the magnet mounting portion 21a at the tip to increase the strength, and the weight of the tip of the rotating shaft L is relatively small, so that the rotation balance can be maintained and the connection strength is increased. can be increased, and the rotating shaft L can be prevented from falling off. As a result, the connection with the rotating shaft L, which is the object to be detected, can be ensured, and the rotation angle can be detected in a stable state.
Further, in the magnet unit 30, since the convex guide portion 21b is provided at the tip of the magnet holding member 20 so as to protrude from the tip surface 10a of the magnet 10, even if rattling of the rotating shaft L in the thrust direction occurs, the magnet 10 is prevented from coming into contact with the bottom surface 44b of the housing portion 44, and the convex guide portion 21b comes into contact first, thereby preventing damage to the magnet 10 even if contact occurs, and stably changing the rotation angle. Detection can continue.

また、回転角度検出装置１では、回転軸Ｌが連結された磁石保持部材２０がハウジング４０の収容部４４に隙間をあけた状態で保持されて回転するので、回転軸Ｌの偏心や振れなどが生じても磁石保持部材２０やハウジング４０の損傷を防止することができ、回転角度の検出を安定した状態で継続することができる。
また、回転角度検出装置１では、磁石保持部材２０の磁石１０に対して、ハウジング４０の収容部４４の底面４４ｂに、凸部４４ｃを形成して磁気検出手段５０を磁石１０と対向させて設置している。凸部４４ｃの内側には、凹部を形成し、凹部をハウジング４０の熱膨張などから磁気検出素子５１を保護する封止部材４７の充填空間とする。これにより、封止部材４７の充填空間を確保し、磁気検出手段５０の磁気検出素子５１と磁石１０とを近づけることが可能となり、磁石１０の回転に伴う磁界の変化を強めて検出することで検出精度を高めることができる。したがって、一層安定した状態で回転角度を検出することができる。
また、回転角度検出装置１では、磁石保持部材２０の外周面とハウジング４０の収容部４４の内周面との寸法差Ｃ１に比べて、磁石保持部材２０の凸状ガイド部２１ｂの内周面とハウジング４０の凸部４４ｃの外周面との寸法差Ｃ２を大きく設定してあり、回転軸Ｌの偏心や振れなどで磁石保持部材２０が過剰に偏心しても磁石保持部材２０の外周面とハウジング４０の収容部４４の内周面とを先に接触させることで、接触面積の広い部分を接触させて応力を分散させることができる。これにより、磁石保持部材２０やハウジング４０の損傷を抑制することができ、安定した状態で回転角度を検出することができる。In addition, in the rotation angle detection device 1, the magnet holding member 20 to which the rotation axis L is connected rotates while being held in the accommodating portion 44 of the housing 40 with a gap therebetween. Even if this occurs, damage to the magnet holding member 20 and the housing 40 can be prevented, and detection of the rotation angle can be continued in a stable state.
Further, in the rotation angle detection device 1 , the magnetic detection means 50 is installed so as to face the magnet 10 of the magnet holding member 20 by forming the convex portion 44 c on the bottom surface 44 b of the accommodating portion 44 of the housing 40 . is doing. A concave portion is formed inside the convex portion 44c, and the concave portion is used as a filling space for a sealing member 47 that protects the magnetic detecting element 51 from thermal expansion of the housing 40 and the like. As a result, it is possible to secure a filling space for the sealing member 47 and bring the magnetism detecting element 51 of the magnetism detecting means 50 closer to the magnet 10, thereby enhancing the change in the magnetic field accompanying the rotation of the magnet 10 and detecting it. Detection accuracy can be improved. Therefore, the rotation angle can be detected in a more stable state.
In addition, in the rotation angle detection device 1, compared to the dimensional difference C1 between the outer peripheral surface of the magnet holding member 20 and the inner peripheral surface of the accommodating portion 44 of the housing 40, the inner peripheral surface of the convex guide portion 21b of the magnet holding member 20 and the outer peripheral surface of the convex portion 44c of the housing 40 is set large, and even if the magnet holding member 20 is excessively eccentric due to eccentricity or vibration of the rotating shaft L, the outer peripheral surface of the magnet holding member 20 and the housing By first contacting the inner peripheral surface of the accommodating portion 44 of 40, a portion having a large contact area can be brought into contact and the stress can be dispersed. As a result, damage to the magnet holding member 20 and the housing 40 can be suppressed, and the rotation angle can be detected in a stable state.

以上、実施の形態とともに、具体的に説明したように、磁石ユニット３０によれば、磁界の変化を検出する磁気検出手段５０に対して回転する磁石１０と、被検出体（回転軸）Ｌが連結されて回転し、磁石１０が取り付けられる柱状の磁石保持部材２０と、を備える磁石ユニット３０であって、磁石保持部材２０は、基端部に回転軸（被検出体）Ｌが連結される連結部２２ａと、先端部に磁石１０が取り付けられる磁石取付部２１ａと、を備え、連結部２２ａは、磁石取付部２１ａより肉厚に形成されているので、回転角度の検出中に、回転軸Ｌの偏心や振れ、あるいはスラスト方向のガタつきが生じても、回転軸Ｌが連結される磁石保持部材２０の連結部２２ａの強度が高く、しかも回転軸Ｌの先端の重量が相対的に小さくなるので、回転バランスを保持することが容易となるとともに、連結強度を高めることができ、回転軸Ｌの抜け落ちを防止することができる。
これにより、被検出体である回転軸Ｌとの連結が確実にでき、安定した状態で回転角度を検出することができる。As described above in detail together with the embodiments, according to the magnet unit 30, the magnet 10 rotating with respect to the magnetic detection means 50 for detecting changes in the magnetic field and the detected body (rotating axis) L A magnet unit 30 including a columnar magnet holding member 20 that is connected and rotated and to which a magnet 10 is attached, the magnet holding member 20 having a base end connected to a rotating shaft (object to be detected) L. A connecting portion 22a and a magnet mounting portion 21a to which the magnet 10 is mounted at the tip portion are provided. The connecting portion 22a is formed thicker than the magnet mounting portion 21a. Even if the eccentricity or deflection of L or rattling in the thrust direction occurs, the strength of the connecting portion 22a of the magnet holding member 20 to which the rotating shaft L is connected is high, and the weight of the tip of the rotating shaft L is relatively small. As a result, it becomes easier to maintain the rotational balance, the strength of the connection can be increased, and the rotation shaft L can be prevented from coming off.
As a result, the connection with the rotating shaft L, which is the object to be detected, can be ensured, and the rotation angle can be detected in a stable state.

また、磁石ユニット３０によれば、磁石保持部材２０は、先端部に磁石１０の先端面１０ａより突き出した凸状ガイド部２１ｂを備えているので、回転軸Ｌにスラスト方向のガタつきが生じても磁石保持部材２０に取り付けられた磁石１０がハウジング４０と直接接触することが回避され、凸状ガイド部２１ｂが先に接触することで、磁石１０や磁石ユニット３０の損傷を防止することができる。これにより、安定した状態で磁石の回転にともなう磁界の変化を継続して検出することができる。 Further, according to the magnet unit 30, since the magnet holding member 20 is provided with the convex guide portion 21b protruding from the tip end surface 10a of the magnet 10 at the tip portion, the rotation axis L rattles in the thrust direction. Direct contact of the magnet 10 attached to the magnet holding member 20 with the housing 40 is avoided, and the convex guide portion 21b contacts first, thereby preventing damage to the magnet 10 and the magnet unit 30. . As a result, it is possible to continuously detect changes in the magnetic field accompanying the rotation of the magnet in a stable state.

回転角度検出装置１によれば、磁界の変化を検出する磁気検出手段５０に対して回転する磁石１０と、被検出体（回転軸）Ｌが連結されて回転し、磁石１０が取り付けられる柱状の磁石保持部材２０と、を有する磁石ユニット３０と、磁石保持部材２０を収容するとともに、磁石１０と対向する磁気検出手段５０が設けられるハウジング４０と、を有する回転角度検出装置１であって、ハウジング４０は、磁石保持部材２０を収容する、開口部４４ａを有して内径Ｄ１（Ｄ２）が磁石保持部材２０の外径ｄ１（ｄ２）より大きい底付き円筒状の収容部４４を備えているので、回転軸Ｌが連結された磁石保持部材２０がハウジング４０の収容部４４に対して隙間をあけた状態で保持して回転することができ、回転軸Ｌの偏心や振れなどが生じても磁石保持部材２０とハウジング４０との接触を回避して損傷を防止することができ、安定した状態で回転角度の検出を継続することができる。 According to the rotation angle detection device 1, the magnet 10 that rotates with respect to the magnetic detection means 50 that detects changes in the magnetic field and the object to be detected (rotational shaft) L are coupled to rotate, and the magnet 10 is attached to the columnar shape. and a magnet unit 30 having a magnet holding member 20 and a housing 40 housing the magnet holding member 20 and provided with a magnetism detecting means 50 facing the magnet 10, wherein the housing 40 is provided with a bottomed cylindrical housing portion 44 having an opening 44a for housing the magnet holding member 20 and having an inner diameter D1 (D2) larger than the outer diameter d1 (d2) of the magnet holding member 20. , the magnet holding member 20 to which the rotating shaft L is connected can be held and rotated with a gap with respect to the accommodating portion 44 of the housing 40, and even if the rotating shaft L is eccentric or shakes, the magnet Damage can be prevented by avoiding contact between the holding member 20 and the housing 40, and detection of the rotation angle can be continued in a stable state.

また、回転角度検出装置１によれば、磁石保持部材２０は、先端部に磁石１０の先端面１０ａより突き出して収容部４４の底面４４ｂと対向する凸状ガイド部２１ｂを備えているので、回転軸Ｌにスラスト方向のガタつきが生じても磁石保持部材２０に取り付けられた磁石１０がハウジング４０と直接接触することが回避され、例え接触が生じても凸状ガイド部２１ｂが先に接触することで、磁石１０の損傷を防止して安定した状態で回転角度の検出を継続することができる。 Further, according to the rotation angle detection device 1, the magnet holding member 20 is provided with the convex guide portion 21b projecting from the tip surface 10a of the magnet 10 at the tip portion and facing the bottom surface 44b of the housing portion 44, so that rotation Even if the shaft L rattles in the thrust direction, the magnet 10 attached to the magnet holding member 20 is prevented from coming into direct contact with the housing 40, and even if contact occurs, the convex guide portion 21b comes into contact first. Thus, it is possible to prevent damage to the magnet 10 and continue detection of the rotation angle in a stable state.

また、回転角度検出装置１によれば、収容部４４は、収容部４４の底面４４ｂに位置し、凸状ガイド部２１ｂの内径ｄ３より小さい外径Ｄ３で突き出して磁石１０に磁気検出手段５０を近づける柱状の凸部４４ｃを備えているので、凸部４４ｃによって封止部材４７の充填空間を確保し、磁石１０と対向させて磁気検出手段５０を設けることで、磁石１０に対して磁気検出手段５０を近づけて設置することができる。これにより、磁石１０の回転に伴う磁界の変化を強めて検出することで検出精度を高めることができ、一層安定した状態で回転角度を検出することができる。 Further, according to the rotation angle detection device 1, the accommodating portion 44 is positioned on the bottom surface 44b of the accommodating portion 44, and protrudes with an outer diameter D3 smaller than the inner diameter d3 of the convex guide portion 21b, so that the magnet 10 is provided with the magnetic detecting means 50. Since the columnar projection 44c is provided, the projection 44c secures a filling space for the sealing member 47, and the magnetic detection means 50 is provided facing the magnet 10. 50 can be placed close together. As a result, detection accuracy can be enhanced by increasing the change in the magnetic field that accompanies the rotation of the magnet 10, and the rotation angle can be detected in a more stable state.

また、回転角度検出装置１によれば、収容部４４は、内径Ｄ１（Ｄ２）と磁石保持部材２０の外径ｄ１（ｄ２）との寸法差Ｃ１より、凸状ガイド部２１ｂの内径ｄ３と凸部４４ｃの外径Ｄ３との寸法差Ｃ２が大きく形成されているので、回転軸Ｌの偏心や振れなどで磁石保持部材２０が過剰に偏心しても寸法差Ｃ１が小さい磁石保持部材２０の外周面とハウジング４０の収容部４４の内周面とが先に接触することで、接触面積の広い部分を接触させて応力を分散させることができる。これにより、磁石保持部材２０や収容部４４の損傷を抑制することができ、安定した状態で回転角度を検出することができる。 Further, according to the rotation angle detection device 1, the accommodation portion 44 has a convex shape with an inner diameter d3 of the convex guide portion 21b due to the dimensional difference C1 between the inner diameter D1 (D2) and the outer diameter d1 (d2) of the magnet holding member 20. Since the dimensional difference C2 from the outer diameter D3 of the portion 44c is formed to be large, even if the magnet holding member 20 is excessively eccentric due to eccentricity or deflection of the rotating shaft L, the outer peripheral surface of the magnet holding member 20 has a small dimensional difference C1. and the inner peripheral surface of the accommodating portion 44 of the housing 40 first, the stress can be dispersed by contacting a portion with a large contact area. As a result, damage to the magnet holding member 20 and the accommodating portion 44 can be suppressed, and the rotation angle can be detected in a stable state.

また、回転角度検出装置１によれば、収容部４４は、開口部４４ａが開口端に向かって内径Ｄ１（Ｄ２）が大きく形成されているので、回転軸Ｌの偏心や振れなどで磁石保持部材２０が過剰に偏心しても回転軸Ｌの接触を防止して安定した状態で回転角度を検出することができる。 Further, according to the rotation angle detection device 1, since the inner diameter D1 (D2) of the opening portion 44a of the accommodating portion 44 is formed to be large toward the opening end, the magnet holding member may be affected by the eccentricity or vibration of the rotation axis L. Even if 20 is excessively eccentric, the rotation angle can be detected in a stable state by preventing contact with the rotating shaft L.

なお、上記の実施の形態では、被検出体である回転軸Ｌとして船舶の船外機用のトリムチルト角度の検出を行う場合を例に説明したが、これに限らず、回転軸Ｌに偏心や振れが生じる場合の回転角度の検出やスラスト方向のガタつきが生じる場合の回転角度の検出に適用することができ、さらに、偏心や振れに加えてスラスト方向のガタつきがある場合であっても適用することができる。
また、本発明は、各実施の形態で説明した構成を単独あるいは組み合わせて構成することができるものである。
さらに、本発明は、上記実施の形態に限定するものではない。In the above-described embodiment, the detection of the trim tilt angle for an outboard motor of a ship was described as an example of detecting the rotation axis L, which is an object to be detected. It can be applied to detect the rotation angle when vibration occurs, or to detect the rotation angle when thrust direction rattle occurs. can be applied.
Moreover, the present invention can be configured by using the configurations described in the respective embodiments singly or in combination.
Furthermore, the present invention is not limited to the above embodiments.

１回転角度検出装置
１０磁石
１０ａ先端面
２０磁石保持部材
２１円筒部
２１ａ磁石取付部
２１ｂ凸状ガイド部
２２円筒部
２２ａ連結部
２２ｂ板ばね装着溝
２３仕切部
３０磁石ユニット
４０ハウジング
４１第１本体部
４２第２本体部
４３固定部
４４収容部
４４ａ開口部
４４ｂ底面
４４ｃ凸部
４５第２収容部
４６コネクタ部
４７封止部材
５０磁気検出手段
５１磁気検出素子
５１ａ検出面
６０回路基板
６１基板
６２貫通孔
６３貫通孔
６４ランド部
６５固定ピン
６６出力用導体
６６ａ出力端子部
６６ｂ中間部
６６ｃ接続端子部
７０板ばね
７０ａ固定片
７０ｂ押え片
７０ｃストッパ片
Ｌ回転軸（被検出体）1 Rotation Angle Detecting Device 10 Magnet 10a Tip Surface 20 Magnet Holding Member 21 Cylindrical Portion 21a Magnet Mounting Portion 21b Convex Guide Portion 22 Cylindrical Portion 22a Connecting Portion 22b Leaf Spring Mounting Groove 23 Partition Portion 30 Magnet Unit 40 Housing 41 First Main Body 42 Second body portion 43 Fixing portion 44 Accommodating portion 44a Opening 44b Bottom surface 44c Convex portion 45 Second accommodating portion 46 Connector portion 47 Sealing member 50 Magnetic detection means 51 Magnetic detection element 51a Detection surface 60 Circuit board 61 Board 62 Through hole 63 through-hole 64 land portion 65 fixing pin 66 output conductor 66a output terminal portion 66b intermediate portion 66c connection terminal portion 70 leaf spring 70a fixing piece 70b pressing piece 70c stopper piece L rotating shaft (object to be detected)

Claims

a magnet rotating with respect to the magnetic sensing means for sensing changes in the magnetic field;
a magnet unit having a columnar magnet holding member to which an object to be detected rotates and to which the magnet is attached;
a rotation angle detection device including a housing that accommodates the magnet holding member and in which the magnetism detection means that faces the magnet is provided,
The housing includes a bottomed cylindrical containing portion having an opening and an inner diameter larger than the outer diameter of the magnet holding member, which contains the magnet holding member ;
The magnet holding member has a convex guide portion protruding from the tip end surface of the magnet and facing the bottom surface of the accommodating portion at the tip portion,
The housing portion is located on the bottom surface of the housing portion and has a columnar projection that protrudes with an outer diameter smaller than the inner diameter of the convex guide portion and allows the magnetic detection means to approach the magnet,
The accommodating portion is formed such that the dimensional difference between the inner diameter of the convex guide portion and the outer diameter of the convex portion is larger than the dimensional difference between the inner diameter and the outer diameter of the magnet holding member.
A rotation angle detection device characterized by:

a magnet rotating with respect to the magnetic sensing means for sensing changes in the magnetic field;
a magnet unit having a columnar magnet holding member to which an object to be detected rotates and to which the magnet is attached;
a rotation angle detection device including a housing that accommodates the magnet holding member and in which the magnetism detection means that faces the magnet is provided,
The housing includes a bottomed cylindrical containing portion having an opening and an inner diameter larger than the outer diameter of the magnet holding member, which contains the magnet holding member;
The magnet holding member has a convex guide portion protruding from the tip end surface of the magnet and facing the bottom surface of the accommodating portion at the tip portion,
The housing portion is located on the bottom surface of the housing portion and has a columnar projection that protrudes with an outer diameter smaller than the inner diameter of the convex guide portion and allows the magnetic detection means to approach the magnet,
The magnet holding member of the rotation angle detection device is
a connecting portion to which the detected body is connected to a base end portion;
and a magnet attachment part to which the magnet is attached at the tip,
The connecting portion is formed thicker than the magnet mounting portion,
A rotation angle detection device characterized by:

a magnet rotating with respect to the magnetic sensing means for sensing changes in the magnetic field;
a magnet unit having a columnar magnet holding member to which an object to be detected rotates and to which the magnet is attached;
a rotation angle detection device including a housing that accommodates the magnet holding member and in which the magnetism detection means that faces the magnet is provided,
The housing includes a bottomed cylindrical containing portion having an opening and an inner diameter larger than the outer diameter of the magnet holding member, which contains the magnet holding member;
The magnet holding member of the rotation angle detection device is
a connecting portion to which the detected body is connected to a base end portion;
and a magnet attachment part to which the magnet is attached at the tip,
The connecting portion is formed thicker than the magnet mounting portion,
A rotation angle detection device characterized by:

In the accommodating part, the opening is formed to be larger than the inner diameter toward the opening end,
The rotation angle detection device according to any one of claims 1 to 3 , characterized in that: