JP2009236722A - Rotating angle detector - Google Patents

Rotating angle detector Download PDF

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JP2009236722A
JP2009236722A JP2008083985A JP2008083985A JP2009236722A JP 2009236722 A JP2009236722 A JP 2009236722A JP 2008083985 A JP2008083985 A JP 2008083985A JP 2008083985 A JP2008083985 A JP 2008083985A JP 2009236722 A JP2009236722 A JP 2009236722A
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axial
rotating body
rotation angle
extending portion
fixed body
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JP4941378B2 (en
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Hisataka Okado
久高 岡戸
Takamitsu Kubota
久保田　　貴光
Sadayuki Kono
河野　　禎之
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Denso Corp
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Denso Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the degradation of detection precision accompanying displacement of a rotor 3 in a rotating angle detector 1 for composing part of a magnetic circuit by the rotor 3 integrally rotated with a rotating shaft 2 and detecting a magnetic flux changed in response to a rotating angle of the rotating shaft 2. <P>SOLUTION: The rotating angle detector fixes first and second stators 5, 6 on both the sides of an axial direction of the rotor 3, and forms first and second axial air gaps a1, a2 between the rotor 3 and the first and second stators 5, 6. In addition, the rotating angle detector includes an axial protrusion 13 opposite to a radial direction to the stator 5 by being projected to one direction side of an axial direction on the outer peripheral side of the first stator 5 on the rotor 3 and forms a radial air gap b between the axial protrusion 13 and the first stator 5. Thereby the rotating angle detector prevents the degradation of detection precision by hardly generating large variation for detection precision of the rotor 3 even when the rotor 3 displaces in any one direction of an axial or radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、弁軸等の回転軸の回転角を検出する回転角検出装置に関する。   The present invention relates to a rotation angle detection device that detects a rotation angle of a rotary shaft such as a valve shaft.

従来から、回転角検出装置では、回転軸と一体的に回転する回転体により磁気回路の一部を構成するとともに、回転軸の回転角に応じて変化する磁束をホール素子等の磁束検出手段により検出することで、回転角を検出するものが公知となっており、例えば、スロットル弁等の各種弁体の回転角の検出に利用されている。すなわち、この回転角検出装置によれば、回転体と軸方向に対向して磁束を通す固定体が備えられ、回転角に応じて、固定体と回転体との間で受け渡される磁束が変化する。そして、回転角検出装置は、この磁束を検出することで回転角を検出する。   Conventionally, in a rotation angle detection device, a part of a magnetic circuit is constituted by a rotating body that rotates integrally with a rotation shaft, and a magnetic flux that changes according to the rotation angle of the rotation shaft is detected by a magnetic flux detection means such as a Hall element. A device that detects the rotation angle by detection is known, and is used, for example, to detect the rotation angle of various valve bodies such as a throttle valve. That is, according to this rotation angle detection device, the fixed body that passes the magnetic flux in the axial direction is provided to the rotating body, and the magnetic flux transferred between the fixed body and the rotating body changes according to the rotation angle. To do. And a rotation angle detection apparatus detects a rotation angle by detecting this magnetic flux.

例えば、特許文献１の回転角検出装置１００Ａによれば、図５に示すように、磁石１０１が円板状に設けられており、磁石１０１自身が回転体１０２をなす。また、磁石１０１は、軸方向一方側と軸方向他方側とで異なる磁性に着磁され、固定体１０３は、磁石１０１を軸方向に挟み込んで軸方向両側で磁石１０１と対向するように配されている。   For example, according to the rotation angle detection device 100 </ b> A of Patent Document 1, as shown in FIG. 5, the magnet 101 is provided in a disc shape, and the magnet 101 itself forms the rotating body 102. The magnet 101 is magnetized with different magnetism on one axial side and the other axial side, and the fixed body 103 is arranged so as to face the magnet 101 on both sides in the axial direction with the magnet 101 sandwiched in the axial direction. ing.

これにより、回転体１０２の回転角に応じて、回転体１０２（磁石１０１）と固定体１０３との軸方向における対向面積が変化するので、磁石１０１と固定体１０３との間で受け渡される磁束も回転角に応じて変化する。このため、回転角検出装置１００Ａは、この磁束を磁束検出手段１０４により検出することで回転角を検出することができる。   As a result, the opposing area in the axial direction between the rotating body 102 (magnet 101) and the fixed body 103 changes according to the rotation angle of the rotating body 102, so that the magnetic flux transferred between the magnet 101 and the fixed body 103 Also changes according to the rotation angle. For this reason, the rotation angle detection device 100 </ b> A can detect the rotation angle by detecting the magnetic flux by the magnetic flux detection means 104.

また、特許文献２の回転角検出装置１００Ｂによれば、図６に示すように、半円弧状の固定体１０３の両端に異なる磁性が現れるように磁石１０１が配され、さらに２つの磁石１０１の間に突起１０５が設けられ、突起１０５上に磁束検出手段１０４が配されている。また、回転体１０２は、板状扇形に設けられ、磁石１０１および磁束検出手段１０４との間に軸方向に所定の距離を維持して回転できるように配されている。   Further, according to the rotation angle detection device 100B of Patent Document 2, as shown in FIG. 6, the magnet 101 is arranged so that different magnetism appears at both ends of the semicircular arc-shaped fixed body 103, and two magnets 101 Protrusions 105 are provided therebetween, and magnetic flux detection means 104 is disposed on the protrusions 105. The rotating body 102 is provided in a plate-shaped sector, and is arranged so as to be able to rotate while maintaining a predetermined distance in the axial direction between the magnet 101 and the magnetic flux detecting means 104.

これにより、回転体１０２の回転角に応じて、磁石１０１と回転体１０２との周方向距離が変化するので、回転体１０２を介して磁石１０１と突起１０５との間で受け渡される磁束も回転角に応じて変化する。このため、回転角検出装置１００Ｂは、この磁束を検出することで回転角を検出することができる。   As a result, the circumferential distance between the magnet 101 and the rotating body 102 changes according to the rotation angle of the rotating body 102, so that the magnetic flux transferred between the magnet 101 and the protrusion 105 via the rotating body 102 also rotates. It changes according to the corner. For this reason, the rotation angle detection device 100B can detect the rotation angle by detecting the magnetic flux.

しかし、回転角検出装置１００Ａ、１００Ｂは、いずれも回転体１０２の位置ずれが検出精度に大きな影響を及ぼすものであり、ロバスト性が低いものとなっている。なお、回転体１０２の位置ずれは、各部品の寸法公差や回転軸のガタツキ等により不可避的に発生するものであり、不可避的な回転体１０２の位置ずれによって、回転角検出装置１００Ａ、１００Ｂの検出精度は必然的に影響を受ける。   However, in each of the rotation angle detection devices 100A and 100B, the positional deviation of the rotating body 102 greatly affects the detection accuracy, and the robustness is low. The positional deviation of the rotating body 102 is inevitably generated due to the dimensional tolerance of each component, the backlash of the rotating shaft, and the like. The inevitable positional deviation of the rotating body 102 causes the rotation angle detection devices 100A and 100B to be displaced. Detection accuracy is necessarily affected.

すなわち、回転角検出装置１００Ａによれば、回転体１０２（磁石１０１）が径方向に位置ずれした場合、回転体１０２と固定体１０３との軸方向における対向面積が変動する。このため、回転体１０２と固定体１０３との間で受け渡される磁束も変動してしまい、回転角の検出値は、位置ずれに伴う誤差を含んだものになってしまう。   That is, according to the rotation angle detection device 100A, when the rotating body 102 (magnet 101) is displaced in the radial direction, the facing area in the axial direction between the rotating body 102 and the fixed body 103 varies. For this reason, the magnetic flux transferred between the rotating body 102 and the fixed body 103 also fluctuates, and the detected value of the rotation angle includes an error due to a positional deviation.

なお、回転角検出装置１００Ａによれば、回転体１０２が軸方向に位置ずれしても、軸方向一方側における回転体１０２と固定体１０３との軸方向エアギャップと、軸方向他方側における回転体１０２と固定体１０３との軸方向エアギャップとの和は不変である。このため、回転体１０２が軸方向に位置ずれしても、回転体１０２と固定体１０３との間で受け渡される磁束は変動せず、回転角の検出値には誤差が含まれない。   According to the rotation angle detection device 100A, even if the rotating body 102 is displaced in the axial direction, the axial air gap between the rotating body 102 and the fixed body 103 on one side in the axial direction and the rotation on the other side in the axial direction. The sum of the axial air gap between the body 102 and the fixed body 103 is unchanged. For this reason, even if the rotating body 102 is displaced in the axial direction, the magnetic flux transferred between the rotating body 102 and the fixed body 103 does not fluctuate, and the detected value of the rotation angle does not include an error.

また、回転角検出装置１００Ｂによれば、回転体１０２が径方向に位置ずれした場合、磁石１０１と回転体１０２との周方向距離が変動する。このため、回転体１０２を介して磁石１０１と突起１０５との間で受け渡される磁束も変動してしまい、回転角の検出値は、位置ずれに伴う誤差を含んだものになってしまう。   Further, according to the rotation angle detection device 100B, when the rotating body 102 is displaced in the radial direction, the circumferential distance between the magnet 101 and the rotating body 102 varies. For this reason, the magnetic flux transferred between the magnet 101 and the projection 105 via the rotating body 102 also fluctuates, and the detected value of the rotation angle includes an error due to the positional deviation.

さらに、回転角検出装置１００Ｂによれば、回転体１０２が軸方向に位置ずれした場合、磁石１０１と回転体１０２との軸方向距離、および磁束検出手段１０４と回転体１０２との軸方向距離が変動する。このため、回転体１０２が軸方向に位置ずれした場合でも、回転角の検出値は、位置ずれに伴う誤差を含んだものになってしまう。
特開２００６−３８８７２号公報 特開平９−２３６６４４号公報 Furthermore, according to the rotation angle detection device 100B, when the rotating body 102 is displaced in the axial direction, the axial distance between the magnet 101 and the rotating body 102 and the axial distance between the magnetic flux detecting means 104 and the rotating body 102 are as follows. fluctuate. For this reason, even when the rotating body 102 is displaced in the axial direction, the detected value of the rotation angle includes an error associated with the displacement.
JP 2006-38872 A Japanese Patent Laid-Open No. 9-236644

本発明は、上記の問題点を解決するためになされたものであり、その目的は、回転軸と一体的に回転する回転体により磁気回路の一部を構成するとともに、回転軸の回転角に応じて変化する磁束を検出する回転角検出装置において、回転体の位置ずれに伴う検出精度の低下を抑制することにある。   The present invention has been made in order to solve the above-described problems. The object of the present invention is to form a part of a magnetic circuit by a rotating body that rotates integrally with a rotating shaft, and to adjust the rotation angle of the rotating shaft. An object of the present invention is to suppress a decrease in detection accuracy caused by a displacement of a rotating body in a rotation angle detection device that detects a magnetic flux that changes in response.

〔請求項１の手段〕
請求項１に記載の回転角検出装置は、所定の回転軸と一体的に回転するとともに磁束を通す回転体と、回転軸と同軸的に配されて回転体の軸方向一方側に固定され、回転体との間で第１の軸方向エアギャップを形成するとともに磁束を通す第１固定体と、回転体の軸方向他方側に固定され、回転体との間で第２の軸方向エアギャップを形成するとともに磁束を通す第２固定体と、回転体を介して第１固定体と第２固定体との間で受け渡される磁束を検出する磁束検出手段とを備える。 [Means of Claim 1]
The rotation angle detection device according to claim 1 is configured to rotate integrally with a predetermined rotation shaft and pass a magnetic flux, and is arranged coaxially with the rotation shaft and fixed to one side in the axial direction of the rotation body. A first fixed air gap that forms a first axial air gap with the rotating body and allows the magnetic flux to pass through, and a second axial air gap that is fixed to the other axial side of the rotating body and is fixed to the rotating body And a magnetic flux detecting means for detecting the magnetic flux passed between the first stationary body and the second stationary body via the rotating body.

そして、回転体は、第１固定体よりも外周側で軸方向一方側に膨出して第１固定体と径方向に対向する軸方向膨出部を有し、軸方向膨出部と第１固定体との間で径方向エアギャップを形成する。   The rotating body has an axially bulging portion that bulges on one side in the axial direction on the outer peripheral side of the first fixed body and faces the first fixed body in the radial direction. A radial air gap is formed with the fixed body.

これにより、回転体が軸方向に位置ずれして第１、第２の軸方向エアギャップがそれぞれ変動しても、第１、第２の軸方向エアギャップの和は不変である。このため、回転体が軸方向に位置ずれしても、回転体を介して第１、第２固定体間で受け渡される磁束は変動しないので、回転体の軸方向の位置ずれが検出精度に影響を及ぼすことはない。   As a result, even if the rotating body is displaced in the axial direction and the first and second axial air gaps change, the sum of the first and second axial air gaps remains unchanged. For this reason, even if the rotating body is displaced in the axial direction, the magnetic flux transferred between the first and second fixed bodies via the rotating body does not fluctuate. There is no effect.

また、回転体が径方向に位置ずれした場合、回転体と第１、第２固定体との軸方向における対向面積が変動するものの、軸方向膨出部と第１固定体との径方向エアギャップも増減する（以下、回転体と第１固定体との軸方向における対向面積を第１軸方向対向面積と呼び、回転体と第２固定体との軸方向における対向面積を第２軸方向対向面積と呼ぶ）。   When the rotating body is displaced in the radial direction, the opposing area in the axial direction between the rotating body and the first and second fixed bodies varies, but the radial air between the axially bulging portion and the first fixed body varies. The gap also increases or decreases (hereinafter, the opposing area in the axial direction between the rotating body and the first fixed body is called the first axial facing area, and the opposing area in the axial direction between the rotating body and the second fixed body is the second axial direction. Called the facing area).

このため、第１、第２軸方向対向面積の変動に伴う磁束の変動を、径方向エアギャップの増減により抑制することができる。この結果、回転体が径方向に位置ずれしても、第１、第２固定体間で受け渡される磁束の変動が抑制され、検出精度に及ぼす影響が低減される。
以上により、回転体が軸方向または径方向のいずれの方向に位置ずれしても、回転角の検出精度に大きな変動が発生しなくなり、検出精度の低下が抑制される。 For this reason, the fluctuation | variation of the magnetic flux accompanying the fluctuation | variation of the 1st, 2nd axial direction opposing area can be suppressed by increase / decrease in a radial direction air gap. As a result, even if the rotating body is displaced in the radial direction, the fluctuation of the magnetic flux transferred between the first and second fixed bodies is suppressed, and the influence on the detection accuracy is reduced.
As described above, even if the rotating body is displaced in either the axial direction or the radial direction, a large variation in the rotational angle detection accuracy does not occur, and a decrease in detection accuracy is suppressed.

〔請求項２の手段〕
請求項２に記載の回転角検出装置によれば、軸方向膨出部は、第１固定体に向かって内周側に伸びるとともに第１固定体と径方向に対向する径方向伸長部を有し、径方向エアギャップは、径方向伸長部により縮小されている。
これにより、回転体と第１固定体との径方向における対向面積（以下、第１径方向対向面積と呼ぶ）を、径方向伸長部と第１固定体との径方向の対向により形成することができる。このため、回転体が軸方向に位置ずれしても第１径方向対向面積が変動しにくくなり、回転体と第１固定体との間で径方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体間で受け渡される磁束の変動がさらに抑制される。 [Means of claim 2]
According to the rotation angle detecting device of the second aspect, the axial bulge portion has a radially extending portion that extends toward the inner peripheral side toward the first fixed body and faces the first fixed body in the radial direction. However, the radial air gap is reduced by the radially extending portion.
Thereby, the opposing area in the radial direction between the rotating body and the first fixed body (hereinafter referred to as the first radial opposing area) is formed by the radial facing between the radial extension portion and the first fixed body. Can do. For this reason, even if the rotating body is displaced in the axial direction, the first radial facing area is less likely to fluctuate, and fluctuations in the magnetic flux delivered in the radial direction between the rotating body and the first fixed body are suppressed. . As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies is further suppressed.

〔請求項３の手段〕
請求項３に記載の回転角検出装置によれば、径方向伸長部の軸方向他端は、第１固定体の軸方向他端よりも軸方向一方側にあり、径方向伸長部の軸方向他端と第１固定体の軸方向他端との軸方向距離は、回転体の軸方向への位置ずれ量として想定される最大値よりも大きい。
これにより、回転体が軸方向に位置ずれしても、径方向伸長部と第１固定体とが、確実に径方向に対向し、同一の第１径方向対向面積を維持することができる。なお、各方向に対する位置ずれ量の最大値は、各部品の寸法公差や回転軸のガタツキ等により事前に想定しておくことができる。 [Means of claim 3]
According to the rotation angle detecting device according to claim 3, the other axial end of the radially extending portion is on one axial side than the other axial end of the first fixed body, and the axial direction of the radially extending portion. The axial distance between the other end and the other axial end of the first fixed body is larger than the maximum value assumed as the amount of positional deviation in the axial direction of the rotating body.
Thereby, even if the rotating body is displaced in the axial direction, the radially extending portion and the first fixed body can reliably face each other in the radial direction, and the same first radial facing area can be maintained. Note that the maximum value of the positional deviation amount in each direction can be assumed in advance based on the dimensional tolerance of each component, the backlash of the rotating shaft, and the like.

〔請求項４の手段〕
請求項４に記載の回転角検出装置によれば、第１固定体は、軸方向膨出部に向かって外周側に伸びるとともに軸方向膨出部と径方向に対向する径方向伸長部を有し、径方向エアギャップは、径方向伸長部により縮小されている。
これにより、第１径方向対向面積を径方向伸長部と軸方向膨出部との径方向の対向により形成することができる。このため、回転体が軸方向に位置ずれしても第１径方向対向面積が変動しにくくなり、回転体と第１固定体との間で径方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体間で受け渡される磁束の変動がさらに抑制される。 [Means of claim 4]
According to the rotation angle detection device of the fourth aspect, the first fixed body has a radially extending portion that extends toward the outer peripheral side toward the axially bulging portion and is opposed to the axially bulging portion in the radial direction. However, the radial air gap is reduced by the radially extending portion.
Thereby, a 1st radial direction opposing area can be formed by radial opposing of a radial direction extension part and an axial bulge part. For this reason, even if the rotating body is displaced in the axial direction, the first radial facing area is less likely to fluctuate, and fluctuations in the magnetic flux delivered in the radial direction between the rotating body and the first fixed body are suppressed. . As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies is further suppressed.

〔請求項５の手段〕
請求項５に記載の回転角検出装置によれば、径方向伸長部の軸方向一端は、軸方向膨出部の軸方向一端よりも軸方向他方側にあり、径方向伸長部の軸方向一端と軸方向膨出部の軸方向一端との軸方向距離は、回転体の軸方向への位置ずれ量として想定される最大値よりも大きい。
これにより、回転体が軸方向に位置ずれしても、径方向伸長部と軸方向膨出部とが、確実に径方向に対向し、同一の第１径方向対向面積を維持することができる。 [Means of claim 5]
According to the rotation angle detecting device of the fifth aspect, the one axial end of the radially extending portion is on the other axial side than the one axial end of the axial bulging portion, and the one axial end of the radially extending portion. And the axial end of the axial bulging portion are larger than the maximum value assumed as the amount of positional deviation in the axial direction of the rotating body.
Thereby, even if the rotating body is displaced in the axial direction, the radially extending portion and the axially bulging portion can be reliably opposed to each other in the radial direction, and the same first radial facing area can be maintained. .

〔請求項６の手段〕
請求項６に記載の回転角検出装置によれば、回転体は、第１固定体に向かって軸方向一方側に伸びるとともに第１固定体と軸方向に対向する軸方向伸長部を有し、第１の軸方向エアギャップは、軸方向伸長部により縮小されている。
これにより、第１軸方向対向面積を軸方向伸長部と第１固定体との軸方向の対向により形成することができる。このため、回転体が径方向に位置ずれしても第１軸方向対向面積が変動しにくくなり、回転体と第１固定体との間で軸方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体間で受け渡される磁束の変動がさらに抑制される。 [Means of claim 6]
According to the rotation angle detection device according to claim 6, the rotating body has an axial extending portion that extends in the axial direction toward the first fixed body and faces the first fixed body in the axial direction, The first axial air gap is reduced by the axial extension.
Thereby, a 1st axial direction opposing area can be formed by axial opposing of an axial direction extension part and a 1st fixing body. For this reason, even if the rotating body is displaced in the radial direction, the area facing the first axial direction is less likely to fluctuate, and fluctuations in the magnetic flux transferred in the axial direction between the rotating body and the first fixed body are suppressed. . As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies is further suppressed.

〔請求項７の手段〕
請求項７に記載の回転角検出装置によれば、軸方向伸長部の外周端は、第１固定体の外周端よりも内周側にあり、軸方向伸長部の外周端と第１固定体の外周端との径方向距離は、回転体の径方向への位置ずれ量として想定される最大値よりも大きい。
これにより、回転体が径方向に位置ずれしても、軸方向伸長部と第１固定体とが、確実に軸方向に対向し、同一の第１軸方向対向面積を維持することができる。 [Means of Claim 7]
According to the rotation angle detection device of claim 7, the outer peripheral end of the axially extending portion is located on the inner peripheral side of the outer peripheral end of the first fixed body, and the outer peripheral end of the axially extending portion and the first fixed body. The radial distance from the outer peripheral edge of the rotating body is larger than the maximum value assumed as the positional deviation amount of the rotating body in the radial direction.
Thereby, even if the rotating body is displaced in the radial direction, the axially extending portion and the first fixed body can reliably face each other in the axial direction and maintain the same first axial facing area.

〔請求項８の手段〕
請求項８に記載の回転角検出装置によれば、第１固定体は、回転体に向かって軸方向他方側に伸びるとともに回転体と軸方向に対向する軸方向伸長部を有し、第１の軸方向エアギャップは、軸方向伸長部により縮小されている。
これにより、第１軸方向対向面積を軸方向伸長部と回転体との軸方向の対向により形成することができる。このため、回転体が径方向に位置ずれしても第１軸方向対向面積が変動しにくくなり、回転体と第１固定体との間で軸方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体間で受け渡される磁束の変動がさらに抑制される。 [Means of Claim 8]
According to the rotation angle detection device of the eighth aspect, the first fixed body has an axially extending portion that extends to the other side in the axial direction toward the rotating body and faces the rotating body in the axial direction. The axial air gap is reduced by the axial extension.
Thereby, a 1st axial direction opposing area can be formed by axial opposing of an axial direction extension part and a rotary body. For this reason, even if the rotating body is displaced in the radial direction, the area facing the first axial direction is less likely to fluctuate, and fluctuations in the magnetic flux transferred in the axial direction between the rotating body and the first fixed body are suppressed. . As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies is further suppressed.

〔請求項９の手段〕
請求項９に記載の回転角検出装置によれば、軸方向伸長部の内周端は、回転体の内周端よりも外周側にあり、軸方向伸長部の内周端と回転体の内周端との径方向距離は、回転体の径方向への位置ずれ量として想定される最大値よりも大きい。
これにより、回転体が径方向に位置ずれしても、軸方向伸長部と回転体とが、確実に軸方向に対向し、同一の第１軸方向対向面積を維持することができる。 [Means of Claim 9]
According to the rotation angle detection device of the ninth aspect, the inner peripheral end of the axially extending portion is located on the outer peripheral side with respect to the inner peripheral end of the rotating member, and the inner peripheral end of the axially extending portion and the inner portion of the rotating member are arranged. The radial distance from the peripheral end is larger than the maximum value assumed as the positional deviation amount of the rotating body in the radial direction.
Thereby, even if the rotating body is displaced in the radial direction, the axially extending portion and the rotating body can reliably face each other in the axial direction and maintain the same first axial facing area.

最良の形態１の回転角検出装置は、所定の回転軸と一体的に回転するとともに磁束を通す回転体と、回転軸と同軸的に配されて回転体の軸方向一方側に固定され、回転体との間で第１の軸方向エアギャップを形成するとともに磁束を通す第１固定体と、回転体の軸方向他方側に固定され、回転体との間で第２の軸方向エアギャップを形成するとともに磁束を通す第２固定体と、回転体を介して第１固定体と第２固定体との間で受け渡される磁束を検出する磁束検出手段とを備える。   The rotation angle detection device of the best mode 1 is a rotating body that rotates integrally with a predetermined rotating shaft and allows magnetic flux to pass through, and is arranged coaxially with the rotating shaft and fixed to one side in the axial direction of the rotating body. A first fixed air gap that forms a first axial air gap with the body and allows the magnetic flux to pass through, and is fixed to the other axial side of the rotating body, and a second axial air gap is formed between the rotating body and the first rotating body. A second fixed body that is formed and allows the magnetic flux to pass through; and a magnetic flux detection means that detects a magnetic flux passed between the first fixed body and the second fixed body via the rotating body.

そして、回転体は、第１固定体よりも外周側で軸方向一方側に膨出して第１固定体と径方向に対向する軸方向膨出部を有し、軸方向膨出部と第１固定体との間で径方向エアギャップを形成する。   The rotating body has an axially bulging portion that bulges on one side in the axial direction on the outer peripheral side of the first fixed body and faces the first fixed body in the radial direction. A radial air gap is formed with the fixed body.

最良の形態２の回転角検出装置によれば、軸方向膨出部は、第１固定体に向かって内周側に伸びるとともに第１固定体と径方向に対向する径方向伸長部を有し、径方向エアギャップは、径方向伸長部により縮小されている。そして、径方向伸長部の軸方向他端は、第１固定体の軸方向他端よりも軸方向一方側にあり、径方向伸長部の軸方向他端と第１固定体の軸方向他端との軸方向距離は、回転体の軸方向への位置ずれ量として想定される最大値よりも大きい。   According to the rotation angle detection device of the best mode 2, the axial bulge portion has a radially extending portion that extends toward the first fixed body on the inner peripheral side and faces the first fixed body in the radial direction. The radial air gap is reduced by the radial extension. The other end in the axial direction of the radially extending portion is on one side in the axial direction than the other end in the axial direction of the first fixed body, and the other end in the axial direction of the radially extending portion and the other axial end of the first fixed body. Is larger than the maximum value assumed as the amount of positional deviation in the axial direction of the rotating body.

また、回転体は、第１固定体に向かって軸方向一方側に伸びるとともに第１固定体と軸方向に対向する軸方向伸長部を有し、第１の軸方向エアギャップは、軸方向伸長部により縮小されている。そして、軸方向伸長部の外周端は、第１固定体の外周端よりも内周側にあり、軸方向伸長部の外周端と第１固定体の外周端との径方向距離は、回転体の径方向への位置ずれ量として想定される最大値よりも大きい。   In addition, the rotating body extends in one axial direction toward the first fixed body and has an axially extending portion facing the first fixed body in the axial direction, and the first axial air gap extends in the axial direction. It is reduced by the part. The outer peripheral end of the axially extending portion is closer to the inner peripheral side than the outer peripheral end of the first fixed body, and the radial distance between the outer peripheral end of the axially extending portion and the outer peripheral end of the first fixed body is the rotating body. It is larger than the maximum value assumed as the positional deviation amount in the radial direction.

最良の形態３の回転角検出装置によれば、第１固定体は、軸方向膨出部に向かって外周側に伸びるとともに軸方向膨出部と径方向に対向する径方向伸長部を有し、径方向エアギャップは、径方向伸長部により縮小されている。そして、径方向伸長部の軸方向一端は、軸方向膨出部の軸方向一端よりも軸方向他方側にあり、径方向伸長部の軸方向一端と軸方向膨出部の軸方向一端との軸方向距離は、回転体の軸方向への位置ずれ量として想定される最大値よりも大きい。   According to the rotation angle detecting device of the best mode 3, the first fixed body has a radially extending portion that extends toward the outer peripheral side toward the axially bulging portion and faces the axially bulging portion in the radial direction. The radial air gap is reduced by the radial extension. The one end in the axial direction of the radially extending portion is located on the other side in the axial direction from the one end in the axial direction of the axially bulging portion, and the one end in the axial direction of the radially extending portion and the one end in the axial direction of the axially bulging portion are The axial distance is larger than the maximum value assumed as the amount of positional deviation in the axial direction of the rotating body.

また、第１固定体は、回転体に向かって軸方向他方側に伸びるとともに回転体と軸方向に対向する軸方向伸長部を有し、第１の軸方向エアギャップは、軸方向伸長部により縮小されている。そして、軸方向伸長部の内周端は、回転体の内周端よりも外周側にあり、軸方向伸長部の内周端と回転体の内周端との径方向距離は、回転体の径方向への位置ずれ量として想定される最大値よりも大きい。   The first fixed body has an axial extension extending in the axial direction toward the rotating body and facing the rotating body in the axial direction, and the first axial air gap is formed by the axial extending section. Has been reduced. The inner peripheral end of the axially extending portion is on the outer peripheral side of the inner peripheral end of the rotating body, and the radial distance between the inner peripheral end of the axially extending portion and the inner peripheral end of the rotating body is It is larger than the maximum value assumed as the positional deviation amount in the radial direction.

〔実施例１の構成〕
実施例１の回転角検出装置１の構成を、図１および図２を用いて説明する。
回転角検出装置１は、回転軸２と一体的に回転する回転体３により磁気回路の一部を構成するとともに、回転軸２の回転角に応じて変化する磁束をホール素子等の磁束検出手段４により検出することで、回転角を検出するものであり、例えば、スロットル弁の回転角の検出に利用されている。そして、回転角検出装置１から出力される電気信号は、例えば、エンジンを制御する電子制御装置（図示せず）に入力されて各種の制御処理に用いられる。 [Configuration of Example 1]
A configuration of the rotation angle detection device 1 according to the first embodiment will be described with reference to FIGS. 1 and 2.
The rotation angle detection device 1 constitutes a part of a magnetic circuit by a rotating body 3 that rotates integrally with a rotation shaft 2, and detects a magnetic flux that changes according to the rotation angle of the rotation shaft 2 as a magnetic flux detection means such as a Hall element. The rotation angle is detected by detecting at 4, and is used, for example, to detect the rotation angle of the throttle valve. And the electrical signal output from the rotation angle detection apparatus 1 is input into the electronic control apparatus (not shown) which controls an engine, for example, and is used for various control processes.

この回転角検出装置１は、回転軸２と一体的に回転する回転体３と、回転軸２と同軸的に配されて回転体３の軸方向一方側に固定される第１固定体５と、回転体３の軸方向他方側に固定される第２固定体６と、回転体３を介して第１固定体５と第２固定体６との間で受け渡される磁束を検出する磁束検出手段４と、２つの磁石７、８とを備える。   The rotation angle detection device 1 includes a rotating body 3 that rotates integrally with the rotating shaft 2, and a first fixed body 5 that is arranged coaxially with the rotating shaft 2 and fixed to one side in the axial direction of the rotating body 3. Magnetic flux detection for detecting a magnetic flux transferred between the first fixed body 5 and the second fixed body 6 via the rotary body 3 and the second fixed body 6 fixed to the other axial side of the rotary body 3 Means 4 and two magnets 7, 8 are provided.

回転体３は、磁束を通す磁性材を素材として半円板形状に設けられている。そして、回転体３は、半円の中心が回転軸２の軸心上に配されるように、例えば、回転軸２の一端に装着されている。また、回転体３の一端面１２には、外周縁に沿って円弧状に軸方向一方側に膨出する軸方向膨出部１３が設けられている。   The rotating body 3 is provided in a semicircular shape using a magnetic material that passes magnetic flux as a material. The rotating body 3 is attached to, for example, one end of the rotating shaft 2 so that the center of the semicircle is disposed on the axis of the rotating shaft 2. Further, an axially bulging portion 13 that bulges along the outer peripheral edge in an arc shape on one side in the axial direction is provided on one end surface 12 of the rotating body 3.

第１固定体５は、磁束を通す磁性材を素材として、回転体３よりも径小の円柱形状に設けられ、回転軸２と同軸的に配されている。また、第１固定体５の他端面１４は回転体３の一端面１２と軸方向に対向しており、一端面１２と他端面１４との対向により、第１固定体５と回転体３との間に第１の軸方向エアギャップａ１が形成されている。   The first fixed body 5 is provided in a columnar shape having a diameter smaller than that of the rotating body 3 using a magnetic material that transmits magnetic flux as a material, and is arranged coaxially with the rotating shaft 2. The other end surface 14 of the first fixed body 5 is opposed to the one end surface 12 of the rotating body 3 in the axial direction, and the first fixed body 5 and the rotating body 3 are opposed by the one end surface 12 and the other end surface 14 facing each other. A first axial air gap a1 is formed between the two.

また、軸方向膨出部１３は、第１固定体５と径方向に対向できるように、第１固定体５よりも外周側で軸方向一方側に膨出しており、軸方向膨出部１３の内周面１５と第１固定体５の外周面１６とが径方向に対向している。そして、内周面１５と外周面１６との対向により、第１固定体５と回転体３との間に径方向エアギャップｂが形成されている。
なお、磁束検出手段４は、第１固定体５の軸方向一端に固定されている。 Further, the axial bulging portion 13 bulges in the axial direction on the outer peripheral side of the first fixed body 5 so as to be opposed to the first fixed body 5 in the radial direction. The inner peripheral surface 15 of the first fixed body 5 and the outer peripheral surface 16 of the first fixed body 5 are opposed to each other in the radial direction. A radial air gap b is formed between the first fixed body 5 and the rotating body 3 by facing the inner peripheral surface 15 and the outer peripheral surface 16.
The magnetic flux detection means 4 is fixed to one axial end of the first fixed body 5.

第２固定体６は、磁束を通す磁性材を素材とする２つの板状体１９、２０からなる。そして、板状体１９、２０は、回転体３よりも径大の半円板形状に設けられている。また、板状体１９、２０には、外周縁と同心の半円状の内周縁が設けられており、内周縁同士が向かい合って略円筒状の中空が形成され、回転軸２は、この中空を貫通するように配されている。   The second fixed body 6 includes two plate-like bodies 19 and 20 made of a magnetic material that passes magnetic flux. The plate-like bodies 19 and 20 are provided in a semicircular shape having a diameter larger than that of the rotating body 3. Further, the plate-like bodies 19 and 20 are provided with semicircular inner peripheral edges concentric with the outer peripheral edges, and the inner peripheral edges face each other to form a substantially cylindrical hollow. It is arranged to penetrate through.

また、板状体１９、２０の一端面２１は回転体３の他端面２２と軸方向に対向可能となるように配されており、一端面２１と他端面２２との対向により、第２固定体６と回転体３との間に第２の軸方向エアギャップａ２が形成されている。   Further, the one end face 21 of the plate-like bodies 19 and 20 is disposed so as to be able to face the other end face 22 of the rotating body 3 in the axial direction, and the second fixing is achieved by facing the one end face 21 and the other end face 22. A second axial air gap a <b> 2 is formed between the body 6 and the rotating body 3.

また、第２固定体６は、軸方向一方側で架橋構造を有しており、この架橋構造によって、第１固定体５、回転体３、第２固定体６および磁石７、８による磁気回路が形成され、磁束は、回転体３を介して第１固定体５と第２固定体６との間で受け渡される。   Further, the second fixed body 6 has a cross-linking structure on one side in the axial direction, and by this cross-linking structure, a magnetic circuit including the first fixed body 5, the rotating body 3, the second fixed body 6, and the magnets 7 and 8. Is formed, and the magnetic flux is transferred between the first fixed body 5 and the second fixed body 6 via the rotating body 3.

すなわち、第２固定体６には、板状体１９、２０の外周縁中央から軸方向一方側に伸びる磁性体２５、２６が一体的に設けられ、磁性体２５、２６は、各々、軸方向一端で直角に折れ曲がって内周側に延びている。また、磁性体２５、２６の内周側への延長部２７、２８と軸方向同位置に、第１固定体５および回転軸２と同軸的に磁性体２９が配され、磁石７、８は延長部２７、２８と磁性体２９とにより径方向に挟持されて固定されている。   That is, the second fixed body 6 is integrally provided with magnetic bodies 25 and 26 extending from the center of the outer peripheral edge of the plate-like bodies 19 and 20 to one side in the axial direction, and the magnetic bodies 25 and 26 are respectively in the axial direction. It bends at a right angle at one end and extends to the inner periphery. In addition, a magnetic body 29 is arranged coaxially with the first fixed body 5 and the rotary shaft 2 at the same position in the axial direction as the extensions 27 and 28 to the inner peripheral side of the magnetic bodies 25 and 26, and the magnets 7 and 8 are The extension portions 27 and 28 and the magnetic body 29 are sandwiched and fixed in the radial direction.

なお、磁石７、８は、柱状に設けられており、磁石７は、外周側がＮ極に着磁され、内周側がＳ極に着磁されている。また、磁石８は、外周側がＳ極に着磁され、内周側がＮ極に着磁されている。また、磁束検出手段４は、磁性体２９と第１固定体５とにより軸方向に挟まれている。   The magnets 7 and 8 are provided in a columnar shape, and the magnet 7 is magnetized on the N pole on the outer peripheral side and magnetized on the S pole on the inner peripheral side. Further, the magnet 8 is magnetized to the S pole on the outer peripheral side and magnetized to the N pole on the inner peripheral side. Further, the magnetic flux detection means 4 is sandwiched between the magnetic body 29 and the first fixed body 5 in the axial direction.

〔実施例１の作用〕
実施例１の回転角検出装置１の作用を、図１および図２を用いて説明する。
回転角検出装置１の回転体３には、各部品の寸法公差や回転軸２のガタツキ等により、不可避的に軸方向や径方向の位置ずれが発生している。そして、回転角検出装置１は、回転体３を介して第１、第２固定体５、６間で受け渡される磁束が回転体３の位置ずれにより変動するのを抑えるように作用する（以下、回転体３の径方向への位置ずれ量を径方向ずれ量、回転体３の軸方向への位置ずれ量を軸方向ずれ量と呼ぶ）。 [Operation of Example 1]
The operation of the rotation angle detection device 1 according to the first embodiment will be described with reference to FIGS. 1 and 2.
The rotating body 3 of the rotation angle detecting device 1 inevitably has a positional deviation in the axial direction or the radial direction due to the dimensional tolerance of each component, the backlash of the rotating shaft 2 or the like. Then, the rotation angle detection device 1 acts so as to suppress the magnetic flux transferred between the first and second fixed bodies 5 and 6 via the rotating body 3 from being fluctuated due to the positional deviation of the rotating body 3 (hereinafter referred to as “rotating body 3”). The displacement amount in the radial direction of the rotating body 3 is referred to as a radial displacement amount, and the displacement amount in the axial direction of the rotating body 3 is referred to as an axial displacement amount).

まず、回転体３が軸方向に位置ずれした場合、第１、第２の軸方向エアギャップａ１、ａ２は、各々、変動するものの、第１、第２の軸方向エアギャップａ１、ａ２の和は不変である（図１（ｃ）参照）。このため、回転体３が軸方向に位置ずれしても、第１、第２固定体５、６間で受け渡される磁束は変動しない。   First, when the rotating body 3 is displaced in the axial direction, the first and second axial air gaps a1 and a2 vary, but the sum of the first and second axial air gaps a1 and a2 respectively. Is unchanged (see FIG. 1C). For this reason, even if the rotary body 3 is displaced in the axial direction, the magnetic flux delivered between the first and second fixed bodies 5 and 6 does not fluctuate.

また、回転体３が径方向に位置ずれした場合、回転体３と第１、第２固定体５、６との軸方向における対向面積が変動する。例えば、回転体３が図示左側に位置ずれした場合（図２（ｂ）参照）、回転体３と第１固定体５との軸方向における対向面積（第１軸方向対向面積）が減少し、回転体３と第２固定体６との軸方向における対向面積（第２軸方向対向面積）が増加する。また、回転体３が図示右側に位置ずれした場合（図２（ｃ）参照）、第１軸方向対向面積が増加し、第２軸方向対向面積が減少する。   Further, when the rotating body 3 is displaced in the radial direction, the facing area in the axial direction between the rotating body 3 and the first and second fixed bodies 5 and 6 varies. For example, when the rotating body 3 is displaced to the left side in the drawing (see FIG. 2B), the facing area in the axial direction of the rotating body 3 and the first fixed body 5 (first axial facing area) decreases. The opposing area in the axial direction between the rotating body 3 and the second fixed body 6 (second axially opposing area) increases. Further, when the rotating body 3 is displaced to the right side in the drawing (see FIG. 2C), the first axial direction opposing area increases and the second axial direction opposing area decreases.

ここで、第１、第２軸方向対向面積の径方向ずれ量に対する変化率の絶対値は、第２軸方向対向面積の方が第１軸方向対向面積よりも大きい。このため、回転体３が図示左側に位置ずれした場合、第１、第２軸方向対向面積の合計が増加し、第１、第２固定体５、６間で軸方向に受け渡される磁束が増加する。また、図示右側に位置ずれした場合、第１、第２軸方向対向面積の合計が減少し、第１、第２固定体５、６間で軸方向に受け渡される磁束が減少する。このように、回転体３が径方向に位置ずれする場合、第１、第２固定体５、６間で軸方向に受け渡される磁束は変動してしまう。   Here, the absolute value of the rate of change of the first and second axial facing areas with respect to the radial deviation is larger in the second axial facing area than in the first axial facing area. For this reason, when the rotating body 3 is displaced to the left in the figure, the total of the first and second axial facing areas increases, and the magnetic flux transferred in the axial direction between the first and second fixed bodies 5 and 6 is increased. To increase. In addition, when the position is shifted to the right side in the figure, the total of the first and second axial facing areas decreases, and the magnetic flux transferred in the axial direction between the first and second fixed bodies 5 and 6 decreases. Thus, when the rotary body 3 is displaced in the radial direction, the magnetic flux delivered in the axial direction between the first and second fixed bodies 5 and 6 will fluctuate.

このような軸方向の磁束変動に対し、回転角検出装置１では、回転体３が図示左側に位置ずれすると径方向エアギャップｂが増加するので、第１、第２固定体５、６間で径方向に受け渡される磁束は減少する（図２（ｂ）参照）。また、回転体３が図示右側に位置ずれすると径方向エアギャップｂが減少するので、第１、第２固定体５、６間で径方向に受け渡される磁束は増加する（図２（ｃ）参照）。   In the rotation angle detection device 1, the radial air gap b increases when the rotating body 3 is displaced to the left in the figure with respect to such an axial magnetic flux fluctuation, and therefore, between the first and second fixed bodies 5 and 6. The magnetic flux delivered in the radial direction decreases (see FIG. 2B). Further, when the rotating body 3 is displaced to the right in the figure, the radial air gap b decreases, so that the magnetic flux delivered in the radial direction between the first and second fixed bodies 5 and 6 increases (FIG. 2C). reference).

このため、回転体３が図示左側に位置ずれして第１、第２固定体５、６間で軸方向に受け渡される磁束が増加しても、径方向に受け渡される磁束は減少する（図２（ｂ）参照）。また、回転体３が図示右側に位置ずれして第１、第２固定体５、６間で軸方向に受け渡される磁束が減少しても、径方向に受け渡される磁束は増加する（図２（ｃ）参照）。この結果、回転体３が径方向に位置ずれしても、第１、第２固定体５、６間で軸方向および径方向の両方で受け渡される磁束全体の変動が抑制される。   For this reason, even if the rotating body 3 is displaced to the left in the figure and the magnetic flux delivered in the axial direction between the first and second fixed bodies 5 and 6 increases, the magnetic flux delivered in the radial direction decreases ( (Refer FIG.2 (b)). Further, even if the rotating body 3 is displaced to the right in the figure and the magnetic flux delivered in the axial direction between the first and second fixed bodies 5 and 6 decreases, the magnetic flux delivered in the radial direction increases (see FIG. 2 (c)). As a result, even if the rotating body 3 is displaced in the radial direction, fluctuations in the entire magnetic flux transferred between the first and second fixed bodies 5 and 6 both in the axial direction and in the radial direction are suppressed.

〔実施例１の効果〕
実施例１の回転角検出装置１によれば、回転軸２と一体的に回転する回転体３の軸方向両側に第１、第２固定体５、６が固定され、回転体３と第１、第２固定体５、６との間に第１、第２の軸方向エアギャップａ１、ａ２が形成されている。また、回転体３は、第１固定体５の外周側で軸方向一方側に膨出して第１固定体５と径方向に対向する軸方向膨出部１３を有し、軸方向膨出部１３と第１固定体５との間で径方向エアギャップｂを形成する。 [Effect of Example 1]
According to the rotation angle detection device 1 of the first embodiment, the first and second fixed bodies 5 and 6 are fixed to both sides in the axial direction of the rotating body 3 that rotates integrally with the rotating shaft 2. The first and second axial air gaps a1 and a2 are formed between the second fixed bodies 5 and 6. The rotating body 3 has an axial bulging portion 13 that bulges on one side in the axial direction on the outer peripheral side of the first fixed body 5 and faces the first fixed body 5 in the radial direction. A radial air gap b is formed between 13 and the first fixed body 5.

これにより、回転体３が軸方向に位置ずれして第１、第２の軸方向エアギャップａ１、ａ２がそれぞれ変動しても、第１、第２の軸方向エアギャップａ１、ａ２の和は不変である。このため、回転体３が軸方向に位置ずれしても、回転体３を介して第１、第２固定体５、６間で受け渡される磁束は変動しないので、回転体３の軸方向の位置ずれが検出精度に影響を及ぼすことはない。   As a result, even if the rotating body 3 is displaced in the axial direction and the first and second axial air gaps a1 and a2 vary, the sum of the first and second axial air gaps a1 and a2 is Is unchanged. For this reason, even if the rotating body 3 is displaced in the axial direction, the magnetic flux transferred between the first and second fixed bodies 5 and 6 via the rotating body 3 does not fluctuate. Misalignment does not affect the detection accuracy.

また、回転体３が径方向に位置ずれした場合、第１、第２軸方向対向面積が変動するものの、径方向エアギャップｂは、第１、第２軸方向対向面積の変動による磁束の変動を打ち消すように増減する。このため、回転体３が径方向に位置ずれしても、第１、第２固定体５、６間で受け渡される磁束の変動が抑制され、検出精度に及ぼす影響が低減される。
以上により、回転体３が軸方向または径方向のいずれの方向に位置ずれしても、回転角の検出精度に大きな変動が発生しなくなり、検出精度の低下が抑制される。 In addition, when the rotating body 3 is displaced in the radial direction, the first and second axial facing areas vary, but the radial air gap b is a fluctuation of magnetic flux due to the variation of the first and second axial facing areas. Increase or decrease to cancel. For this reason, even if the rotating body 3 is displaced in the radial direction, the fluctuation of the magnetic flux transferred between the first and second fixed bodies 5 and 6 is suppressed, and the influence on the detection accuracy is reduced.
As described above, even if the rotating body 3 is displaced in either the axial direction or the radial direction, a large fluctuation in the rotational angle detection accuracy does not occur, and a decrease in detection accuracy is suppressed.

実施例２の回転角検出装置１によれば、図３に示すように、軸方向膨出部１３は、第１固定体５に向かって内周側に伸びる円弧状の径方向伸長部３２を有する。そして、径方向伸長部３２の内周端３３は、第１固定体５の外周面１６と径方向に対向しており、径方向エアギャップｂは、径方向伸長部３２により縮小されている。   According to the rotation angle detection device 1 of the second embodiment, as shown in FIG. 3, the axial bulging portion 13 includes an arc-shaped radial extending portion 32 extending toward the inner peripheral side toward the first fixed body 5. Have. The inner peripheral end 33 of the radial extension part 32 faces the outer peripheral surface 16 of the first fixed body 5 in the radial direction, and the radial air gap b is reduced by the radial extension part 32.

これにより、回転体３と第１固定体５との径方向における対向面積（第１径方向対向面積）を、径方向伸長部３２と第１固定体５との径方向の対向により形成することができる。このため、回転体３が軸方向に位置ずれしても第１径方向対向面積が変動しにくくなり、回転体３と第１固定体５との間で径方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体５、６間で受け渡される磁束の変動がさらに抑制される。   Thereby, the opposing area in the radial direction between the rotating body 3 and the first fixed body 5 (first radial opposing area) is formed by the radial facing between the radial extending portion 32 and the first fixed body 5. Can do. For this reason, even if the rotating body 3 is displaced in the axial direction, the first radial facing area is less likely to fluctuate, and the fluctuation of the magnetic flux transferred in the radial direction between the rotating body 3 and the first fixed body 5 is changed. It is suppressed. As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies 5 and 6 is further suppressed.

また、径方向伸長部３２の軸方向他端３４は、第１固定体５の他端面１４よりも軸方向一方側にあり、軸方向他端３４と他端面１４との軸方向距離Ａ１は、軸方向ずれ量として想定される最大値よりも大きい。
これにより、回転体３が軸方向に位置ずれしても、径方向伸長部３２と第１固定体５とが、確実に径方向に対向し、同一の第１径方向対向面積を維持することができる。なお、軸方向ずれ量および径方向ずれ量の最大値は、各部品の寸法公差や回転軸２のガタツキ等により事前に想定しておくことができる。 Further, the other axial end 34 of the radially extending portion 32 is on one axial side than the other end surface 14 of the first fixed body 5, and the axial distance A1 between the other axial end 34 and the other end surface 14 is It is larger than the maximum value assumed as the amount of axial deviation.
Thereby, even if the rotary body 3 is displaced in the axial direction, the radially extending portion 32 and the first fixed body 5 reliably face each other in the radial direction and maintain the same first radial facing area. Can do. It should be noted that the maximum values of the axial direction deviation amount and the radial direction deviation amount can be assumed in advance based on the dimensional tolerance of each component, the backlash of the rotating shaft 2, and the like.

また、回転体３は、第１固定体５に向かって軸方向一方側に伸びる扇形状の軸方向伸長部３６を有する。そして、軸方向伸長部３６の軸方向一端３７は、第１固定体５の他端面１４と軸方向に対向しており、第１の軸方向エアギャップａ１は、軸方向伸長部３６により縮小されている。   The rotating body 3 includes a fan-shaped axially extending portion 36 that extends toward the first fixed body 5 on one side in the axial direction. An axial end 37 of the axially extending portion 36 faces the other end surface 14 of the first fixed body 5 in the axial direction, and the first axial air gap a1 is reduced by the axially extending portion 36. ing.

これにより、第１軸方向対向面積を、軸方向伸長部３６と第１固定体５との軸方向の対向により形成することができる。このため、回転体３が径方向に位置ずれしても第１軸方向対向面積が変動しにくくなり、回転体３と第１固定体５との間で軸方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体５、６間で受け渡される磁束の変動がさらに抑制される。   Thereby, the first axially opposed area can be formed by axially opposing the axially extending portion 36 and the first fixed body 5. For this reason, even if the rotating body 3 is displaced in the radial direction, the area facing the first axial direction is less likely to fluctuate, and the fluctuation of the magnetic flux transferred in the axial direction between the rotating body 3 and the first fixed body 5 is changed. It is suppressed. As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies 5 and 6 is further suppressed.

また、軸方向伸長部３６の外周面３８は、第１固定体５の外周面１６よりも内周側にあり、外周面３８と外周面１６との径方向距離Ｂ１は径方向ずれ量として想定される最大値よりも大きい。
これにより、回転体３が径方向に位置ずれしても、軸方向伸長部３６と第１固定体５とが、確実に軸方向に対向し、同一の第１軸方向対向面積を維持することができる。 Further, the outer peripheral surface 38 of the axially extending portion 36 is located on the inner peripheral side with respect to the outer peripheral surface 16 of the first fixed body 5, and the radial distance B1 between the outer peripheral surface 38 and the outer peripheral surface 16 is assumed as the radial deviation amount. Is greater than the maximum value
Thereby, even if the rotating body 3 is displaced in the radial direction, the axially extending portion 36 and the first fixed body 5 reliably face each other in the axial direction and maintain the same first axial facing area. Can do.

実施例３の回転角検出装置１によれば、図４に示すように、第１固定体５は、軸方向膨出部１３に向かって外周側に伸びるとともに回転体３に向かって軸方向他方側に伸びる円環状の伸長部４０を有する。そして、伸長部４０の外周面４１は、軸方向膨出部１３の内周面１５と径方向に対向しており、径方向エアギャップｂは伸長部４０により縮小されている。つまり、伸長部４０は、実施例２の径方向伸長部３２と同様の機能を有している。   According to the rotation angle detection device 1 of the third embodiment, as shown in FIG. 4, the first fixed body 5 extends toward the outer peripheral side toward the axial bulging portion 13 and the other axial direction toward the rotary body 3. It has an annular extension 40 extending to the side. The outer peripheral surface 41 of the extending portion 40 faces the inner peripheral surface 15 of the axial bulging portion 13 in the radial direction, and the radial air gap b is reduced by the extending portion 40. That is, the extending portion 40 has a function similar to that of the radially extending portion 32 of the second embodiment.

これにより、第１径方向対向面積を伸長部４０と軸方向膨出部１３との径方向の対向により形成することができる。このため、回転体３が軸方向に位置ずれしても第１径方向対向面積が変動しにくくなり、回転体３と第１固定体５との間で径方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体５、６間で受け渡される磁束の変動がさらに抑制される。   Thus, the first radial facing area can be formed by the radial facing of the extending portion 40 and the axial bulging portion 13. For this reason, even if the rotating body 3 is displaced in the axial direction, the first radial facing area is less likely to fluctuate, and the fluctuation of the magnetic flux transferred in the radial direction between the rotating body 3 and the first fixed body 5 is changed. It is suppressed. As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies 5 and 6 is further suppressed.

また、伸長部４０の軸方向一端４２は、軸方向膨出部１３の軸方向一端４３よりも軸方向他方側にあり、軸方向一端４２と軸方向一端４３との軸方向距離Ａ２は、軸方向ずれ量として想定される最大値よりも大きい。
これにより、回転体３が軸方向に位置ずれしても、伸長部４０と軸方向膨出部１３とが、確実に径方向に対向し、同一の第１径方向対向面積を維持することができる。 The axial end 42 of the extending portion 40 is located on the other axial side of the axial end 43 of the axial bulging portion 13, and the axial distance A2 between the axial end 42 and the axial end 43 is the axis It is larger than the maximum value assumed as the amount of direction deviation.
Thereby, even if the rotating body 3 is displaced in the axial direction, the extending portion 40 and the axially bulging portion 13 can reliably face each other in the radial direction and maintain the same first radial facing area. it can.

また、伸長部４０の軸方向他端４４は、回転体３の一端面１２と軸方向に対向しており、第１の軸方向エアギャップａ１は伸長部４０により縮小されている。つまり、伸長部４０は、実施例２の軸方向伸長部３６と同様の機能を有している。   Further, the other axial end 44 of the extending portion 40 faces the one end surface 12 of the rotating body 3 in the axial direction, and the first axial air gap a <b> 1 is reduced by the extending portion 40. That is, the extending portion 40 has a function similar to that of the axial extending portion 36 of the second embodiment.

これにより、第１軸方向対向面積を伸長部４０と回転体３との軸方向の対向により形成することができる。このため、回転体３が径方向に位置ずれしても第１軸方向対向面積が変動しにくくなり、結果的に、回転体３と第１固定体５との間で軸方向に受け渡される磁束の変動が抑制される。この結果、第１、第２固定体５、６間で受け渡される磁束の変動がさらに抑制される。   As a result, the first axial facing area can be formed by the axial facing of the elongated portion 40 and the rotating body 3. For this reason, even if the rotating body 3 is displaced in the radial direction, the first axial facing area is less likely to fluctuate, and as a result, the rotating body 3 is passed between the rotating body 3 and the first fixed body 5 in the axial direction. Fluctuation of magnetic flux is suppressed. As a result, the fluctuation of the magnetic flux transferred between the first and second fixed bodies 5 and 6 is further suppressed.

また、伸長部４０の内周面４５は、回転体３の内周端４６よりも外周側にあり、内周面４５と内周端４６との径方向距離Ｂ２は、径方向ずれ量として想定される最大値よりも大きい。
これにより、回転体３が径方向に位置ずれしても、伸長部４０と回転体３とは、確実に軸方向に対向し、同一の第１軸方向対向面積を維持することができる。 Further, the inner peripheral surface 45 of the extending portion 40 is on the outer peripheral side with respect to the inner peripheral end 46 of the rotating body 3, and the radial distance B2 between the inner peripheral surface 45 and the inner peripheral end 46 is assumed as a radial deviation amount. Is greater than the maximum value
Thereby, even if the rotating body 3 is displaced in the radial direction, the extending portion 40 and the rotating body 3 can reliably face each other in the axial direction and maintain the same first axial facing area.

〔変形例〕
実施例２の回転角検出装置１によれば、径方向伸長部３２および軸方向伸長部３６の機能が両方とも回転体３に具備され、実施例３の回転角検出装置１によれば、径方向伸長部３２および軸方向伸長部３６の機能が両方とも第１固定体５に具備されていたが、例えば、回転体３および第１固定体５のいずれか一方に径方向伸長部３２の機能を具備させ、他方に軸方向伸長部３６の機能を具備させてもよく、回転体３および第１固定体５の両方に径方向伸長部３２の機能を具備させてもよく、回転体３および第１固定体５の両方に軸方向伸長部３６の機能を具備させてもよい。 [Modification]
According to the rotation angle detection device 1 of the second embodiment, the functions of the radial extension portion 32 and the axial extension portion 36 are both provided in the rotating body 3, and according to the rotation angle detection device 1 of the third embodiment, the diameter Both the functions of the direction extension part 32 and the axial direction extension part 36 are provided in the first fixed body 5. For example, the function of the radial direction extension part 32 is provided in one of the rotating body 3 and the first fixed body 5. And the other side may be provided with the function of the axial extension part 36, and both the rotary body 3 and the first fixed body 5 may be provided with the function of the radial extension part 32. Both of the first fixed bodies 5 may be provided with the function of the axially extending portion 36.

また、実施例３の回転角検出装置１によれば、１つの伸長部４０が径方向伸長部３２および軸方向伸長部３６の機能を担っていたが、径方向伸長部３２および軸方向伸長部３６を個別に設けてもよい。
また、径方向伸長部３２および軸方向伸長部３６のいずれか一方を設定することなく、回転角検出装置１を構成してもよい。 Further, according to the rotation angle detection device 1 of the third embodiment, one extending portion 40 functions as the radial extending portion 32 and the axial extending portion 36, but the radial extending portion 32 and the axial extending portion. 36 may be provided individually.
Moreover, you may comprise the rotation angle detection apparatus 1 without setting any one of the radial direction expansion | extension part 32 and the axial direction expansion | extension part 36. FIG.

また、実施例１〜３の回転角検出装置１によれば、軸方向膨出部１３は、回転体３の一端面１２から外周縁に沿って円弧状に軸方向一方側に膨出するように設けられていたが、このような形態に限定されず、例えば、軸方向膨出部１３を、軸方向一方側に柱状に膨出するように設けてもよい。   Further, according to the rotation angle detection device 1 of the first to third embodiments, the axial bulging portion 13 bulges from the one end surface 12 of the rotating body 3 in an arc shape along the outer peripheral edge to one axial direction side. However, the present invention is not limited to such a form. For example, the axial bulging portion 13 may be provided so as to bulge in a columnar shape on one side in the axial direction.

また、実施例２、３の回転角検出装置１によれば、径方向伸長部３２は円弧状または円環状に設けられ、軸方向伸長部３６は扇形状または円環状に設けられていたが、このような形態に限定されず、例えば、径方向伸長部３２を柱状に設けてもよく、軸方向伸長部３６を柱状に設けてもよい。   Further, according to the rotation angle detection device 1 of the second and third embodiments, the radial extending portion 32 is provided in an arc shape or an annular shape, and the axial extending portion 36 is provided in a fan shape or an annular shape. For example, the radially extending portion 32 may be provided in a column shape, and the axial extending portion 36 may be provided in a column shape.

また、実施例１〜３の回転角検出装置１によれば、磁束検出手段４は第１固定体５の軸方向一端に固定され、磁石７、８は延長部２７、２８と磁性体２９とにより径方向に挟持されて固定されていたが、磁束検出手段４および磁石７、８の位置や形状等はこのような態様に限定されるものではない。例えば、第１、第２固定体５、６の一部を磁石７、８により設けてもよく、磁性体２５、２６内や第１、第２固定体５、６内に磁束検出手段４を配してもよい。   Further, according to the rotation angle detection device 1 of the first to third embodiments, the magnetic flux detection means 4 is fixed to one end in the axial direction of the first fixed body 5, and the magnets 7 and 8 are the extension portions 27 and 28 and the magnetic body 29. However, the positions and shapes of the magnetic flux detection means 4 and the magnets 7 and 8 are not limited to such a mode. For example, a part of the first and second fixed bodies 5 and 6 may be provided by the magnets 7 and 8, and the magnetic flux detection means 4 is provided in the magnetic bodies 25 and 26 or in the first and second fixed bodies 5 and 6. It may be arranged.

さらに、実施例１〜３の回転角検出装置１は、スロットル弁の回転角検出に利用されていたが、ＥＧＲ弁等の他の吸気系統に用いられる弁体の回転角検出に利用してもよく、吸気系統に用いられる弁体以外の他の弁体の回転角検出に利用してもよい。   Further, the rotation angle detection device 1 of the first to third embodiments has been used for detecting the rotation angle of the throttle valve, but can also be used for detection of the rotation angle of a valve body used in other intake systems such as an EGR valve. Of course, it may be used for detecting the rotation angle of a valve body other than the valve body used in the intake system.

（ａ）は回転角検出装置を示す正面構成図であり、（ｂ）は（ａ）のＡ−Ａ断面図であり、（ｃ）は回転角検出装置の要部拡大図である（実施例１）。(A) is a front block diagram which shows a rotation angle detection apparatus, (b) is AA sectional drawing of (a), (c) is the principal part enlarged view of a rotation angle detection apparatus (Example) 1). 回転体の径方向への位置ずれによる配置関係の変動を示す説明図である（実施例１）。It is explanatory drawing which shows the fluctuation | variation of the arrangement | positioning relationship by the position shift to the radial direction of a rotary body (Example 1). 回転角検出装置の要部拡大図である（実施例２）。(Example 2) which is a principal part enlarged view of a rotation angle detection apparatus. 回転角検出装置の要部拡大図である（実施例３）。(Example 3) which is a principal part enlarged view of a rotation angle detection apparatus. （ａ）は回転角検出装置の平面図であり、（ｂ）は（ａ）のＢ−Ｂ断面図である（従来例）。(A) is a top view of a rotation angle detection apparatus, (b) is BB sectional drawing of (a) (conventional example). （ａ）は回転角検出装置の平面図であり、（ｂ）は回転角検出装置の正面図である（従来例）。(A) is a top view of a rotation angle detection apparatus, (b) is a front view of a rotation angle detection apparatus (conventional example).

符号の説明Explanation of symbols

１ 回転角検出装置
２ 回転軸
３ 回転体
４ 磁束検出手段
５ 第１固定体
６ 第２固定体
１３ 軸方向膨出部
１４ 他端面（第１固定体の軸方向他端）
１６ 外周面（第１固定体の外周端）
３２ 径方向伸長部
３４ 軸方向他端（径方向伸長部の軸方向他端）
３６ 軸方向伸長部
３８ 外周面（軸方向伸長部の外周端）
４０ 伸長部（径方向伸長部、軸方向伸長部）
４２ 軸方向一端（径方向伸長部の軸方向一端）
４３ 軸方向一端（軸方向膨出部の軸方向一端）
４５ 内周面（軸方向伸長部の内周端）
４６ 内周端（回転体の内周端）
ａ１ 第１の軸方向エアギャップ
ａ２ 第２の軸方向エアギャップ
ｂ 径方向エアギャップ
Ａ１ 軸方向距離（径方向伸長部の軸方向他端と第１固定体の軸方向他端との軸方向距離）
Ａ２ 軸方向距離（径方向伸長部の軸方向一端と軸方向膨出部の軸方向一端との軸方向距離）
Ｂ１ 径方向距離（軸方向伸長部の外周端と第１固定体の外周端との径方向距離）
Ｂ２ 径方向距離（軸方向伸長部の内周端と回転体の内周端との径方向距離） DESCRIPTION OF SYMBOLS 1 Rotation angle detection apparatus 2 Rotating shaft 3 Rotating body 4 Magnetic flux detection means 5 First fixed body 6 Second fixed body 13 Axial bulging portion 14 The other end surface (the other axial end of the first fixed body)
16 outer peripheral surface (the outer peripheral edge of the first fixed body)
32 Radial extension 34 The other axial end (the other axial end of the radial extension)
36 Axial extension part 38 outer peripheral surface (outer peripheral end of the axial extension part)
40 Extension part (radial extension part, axial extension part)
42 One axial end (one axial end of the radially extending portion)
43 One axial end (one axial end of the axial bulge)
45 Inner peripheral surface (inner peripheral end of axial extension)
46 Inner edge (inner edge of rotating body)
a1 first axial air gap a2 second axial air gap b radial air gap A1 axial distance (axial distance between the other axial end of the radially extending portion and the other axial end of the first fixed body )
A2 Axial distance (Axial distance between one axial end of the radially extending portion and one axial end of the axially bulging portion)
B1 radial distance (radial distance between the outer peripheral end of the axially extending portion and the outer peripheral end of the first fixed body)
B2 Radial distance (radial distance between the inner peripheral end of the axially extending portion and the inner peripheral end of the rotating body)

Claims (9)

所定の回転軸と一体的に回転するとともに磁束を通す回転体と、
前記回転軸と同軸的に配されて前記回転体の軸方向一方側に固定され、前記回転体との間で第１の軸方向エアギャップを形成するとともに磁束を通す第１固定体と、
前記回転体の軸方向他方側に固定され、前記回転体との間で第２の軸方向エアギャップを形成するとともに磁束を通す第２固定体と、
前記回転体を介して前記第１固定体と前記第２固定体との間で受け渡される磁束を検出する磁束検出手段とを備え、
前記回転体は、
前記第１固定体よりも外周側で軸方向一方側に膨出して前記第１固定体と径方向に対向する軸方向膨出部を有し、
この軸方向膨出部と前記第１固定体との間で径方向エアギャップを形成することを特徴とする回転角検出装置。 A rotating body that rotates integrally with a predetermined rotating shaft and passes magnetic flux;
A first fixed body that is arranged coaxially with the rotary shaft and fixed to one side in the axial direction of the rotary body, forms a first axial air gap with the rotary body, and passes a magnetic flux;
A second fixed body fixed on the other axial side of the rotating body, forming a second axial air gap with the rotating body and passing a magnetic flux;
Magnetic flux detection means for detecting magnetic flux passed between the first fixed body and the second fixed body via the rotating body,
The rotating body is
An axially bulging portion that bulges on one side in the axial direction on the outer peripheral side of the first fixed body and faces the first fixed body in the radial direction;
A rotation angle detection device characterized in that a radial air gap is formed between the axial bulging portion and the first fixed body. 請求項１に記載の回転角検出装置において、
前記軸方向膨出部は、前記第１固定体に向かって内周側に伸びるとともに前記第１固定体と径方向に対向する径方向伸長部を有し、
前記径方向エアギャップは、前記径方向伸長部により縮小されていることを特徴とする回転角検出装置。 The rotation angle detection device according to claim 1,
The axial bulging portion has a radially extending portion that extends radially inward toward the first fixed body and faces the first fixed body in a radial direction,
The rotation angle detection device according to claim 1, wherein the radial air gap is reduced by the radial extension portion. 請求項２に記載の回転角検出装置において、
前記径方向伸長部の軸方向他端は、前記第１固定体の軸方向他端よりも軸方向一方側にあり、
前記径方向伸長部の軸方向他端と前記第１固定体の軸方向他端との軸方向距離は、前記回転体の軸方向への位置ずれ量として想定される最大値よりも大きいことを特徴とする回転角検出装置。 In the rotation angle detection device according to claim 2,
The other axial end of the radially extending portion is on one axial side than the other axial end of the first fixed body,
An axial distance between the other axial end of the radially extending portion and the other axial end of the first fixed body is larger than a maximum value assumed as an amount of positional deviation in the axial direction of the rotating body. A rotation angle detection device. 請求項１に記載の回転角検出装置において、
前記第１固定体は、前記軸方向膨出部に向かって外周側に伸びるとともに前記軸方向膨出部と径方向に対向する径方向伸長部を有し、
前記径方向エアギャップは、前記径方向伸長部により縮小されていることを特徴とする回転角検出装置。 The rotation angle detection device according to claim 1,
The first fixed body has a radially extending portion that extends radially toward the axial bulging portion and faces the axial bulging portion in a radial direction,
The rotation angle detection device according to claim 1, wherein the radial air gap is reduced by the radial extension portion. 請求項４に記載の回転角検出装置において、
前記径方向伸長部の軸方向一端は、前記軸方向膨出部の軸方向一端よりも軸方向他方側にあり、
前記径方向伸長部の軸方向一端と前記軸方向膨出部の軸方向一端との軸方向距離は、前記回転体の軸方向への位置ずれ量として想定される最大値よりも大きいことを特徴とする回転角検出装置。 In the rotation angle detection device according to claim 4,
One axial end of the radially extending portion is on the other axial side than one axial end of the axial bulge portion,
An axial distance between one axial end of the radially extending portion and one axial end of the axial bulging portion is larger than a maximum value assumed as a positional deviation amount of the rotating body in the axial direction. The rotation angle detection device. 請求項１ないし請求項５に記載の回転角検出装置において、
前記回転体は、前記第１固定体に向かって軸方向一方側に伸びるとともに前記第１固定体と軸方向に対向する軸方向伸長部を有し、
前記第１の軸方向エアギャップは、前記軸方向伸長部により縮小されていることを特徴とする回転角検出装置。 In the rotation angle detection device according to any one of claims 1 to 5,
The rotating body has an axially extending portion that extends in one axial direction toward the first fixed body and faces the first fixed body in the axial direction,
The rotation angle detecting device according to claim 1, wherein the first axial air gap is reduced by the axial extending portion. 請求項６に記載の回転角検出装置において、
前記軸方向伸長部の外周端は、前記第１固定体の外周端よりも内周側にあり、
前記軸方向伸長部の外周端と前記第１固定体の外周端との径方向距離は、前記回転体の径方向への位置ずれ量として想定される最大値よりも大きいことを特徴とする回転角検出装置。 The rotation angle detection device according to claim 6,
The outer peripheral end of the axially extending portion is closer to the inner peripheral side than the outer peripheral end of the first fixed body,
A rotation characterized in that a radial distance between an outer peripheral end of the axially extending portion and an outer peripheral end of the first fixed body is larger than a maximum value assumed as a displacement amount of the rotating body in the radial direction. Angle detection device. 請求項１ないし請求項５に記載の回転角検出装置において、
前記第１固定体は、前記回転体に向かって軸方向他方側に伸びるとともに前記回転体と軸方向に対向する軸方向伸長部を有し、
前記第１の軸方向エアギャップは、前記軸方向伸長部により縮小されていることを特徴とする回転角検出装置。 In the rotation angle detection device according to any one of claims 1 to 5,
The first fixed body has an axially extending portion that extends to the other side in the axial direction toward the rotating body and faces the rotating body in the axial direction;
The rotation angle detecting device according to claim 1, wherein the first axial air gap is reduced by the axial extending portion. 請求項８に記載の回転角検出装置において、
前記軸方向伸長部の内周端は、前記回転体の内周端よりも外周側にあり、
前記軸方向伸長部の内周端と前記回転体の内周端との径方向距離は、前記回転体の径方向への位置ずれ量として想定される最大値よりも大きいことを特徴とする回転角検出装置。 In the rotation angle detection device according to claim 8,
The inner peripheral end of the axially extending portion is on the outer peripheral side than the inner peripheral end of the rotating body,
A rotation characterized in that a radial distance between an inner peripheral end of the axially extending portion and an inner peripheral end of the rotating body is larger than a maximum value assumed as a displacement amount of the rotating body in the radial direction. Angle detection device.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103296852A (en) * 2012-03-01 2013-09-11 何嘉颖 Novel electromagnetic device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09236644A (en) * 1996-02-29 1997-09-09 Nissan Motor Co Ltd Magnetic potentiometer
JP2006038872A (en) * 2005-08-17 2006-02-09 Hitachi Ltd Throttle valve assembly having noncontact type rotation position sensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09236644A (en) * 1996-02-29 1997-09-09 Nissan Motor Co Ltd Magnetic potentiometer
JP2006038872A (en) * 2005-08-17 2006-02-09 Hitachi Ltd Throttle valve assembly having noncontact type rotation position sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103296852A (en) * 2012-03-01 2013-09-11 何嘉颖 Novel electromagnetic device

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