JP6459141B2 - Reactor - Google Patents

Description

本発明は、ハイブリッド自動車などの車両に搭載される車載用ＤＣ−ＤＣコンバータや電力変換装置の構成部品などに利用されるリアクトルに関する。特に、部品点数が少なく、組合体をケースに強固に固定でき、組立作業性に優れるリアクトルに関する。   The present invention relates to a reactor that is used in a vehicle-mounted DC-DC converter or a component of a power converter mounted on a vehicle such as a hybrid vehicle. In particular, the present invention relates to a reactor that has a small number of parts, can firmly fix an assembly to a case, and has excellent assembly workability.

電圧の昇圧動作や降圧動作を行う回路の部品の一つに、リアクトルがある。特許文献１には、コイルと、コイルが配置される磁性コアと、コイルと磁性コアとの組合体を収納するケースと、ケース内に充填される封止樹脂部と、を備えるリアクトルが開示されている。組合体のケースへの固定は、磁性コアのうちコイルの外側に配置される外側コア部の上面に接するようにステーを配置し、このステーをケースに設けられたステー取付部にネジ止めすることで行っている。このステーによって外側コア部がケースの底面側に押圧されて、組合体がケースに固定される。   A reactor is one of the parts of a circuit that performs a voltage step-up operation or a voltage step-down operation. Patent Document 1 discloses a reactor including a coil, a magnetic core in which the coil is disposed, a case that houses a combination of the coil and the magnetic core, and a sealing resin portion that is filled in the case. ing. To fix the combination to the case, place the stay in contact with the upper surface of the outer core part that is located outside the coil of the magnetic core, and screw this stay to the stay mounting part provided in the case. Is going on. The stay presses the outer core portion toward the bottom surface of the case, and the assembly is fixed to the case.

特開２０１４−１０７２９４号公報JP 2014-107294 A

リアクトルの部品点数の削減、及びリアクトルの組立作業性の向上が望まれている。   It is desired to reduce the number of reactor parts and to improve the assembly workability of the reactor.

組合体をケースに固定するにあたり、特許文献１のステーを用いると、ステーが組合体やケースとは別部材であるために取り扱い難く、組合体及びケースに対してステーを位置決めし難い。   When fixing the assembly to the case, using the stay of Patent Document 1, it is difficult to handle because the stay is a separate member from the assembly and the case, and it is difficult to position the stay relative to the assembly and the case.

本発明は上記事情に鑑みてなされたもので、本発明の目的の一つは、部品点数が少なく、組合体をケースに強固に固定でき、組立作業性に優れるリアクトルを提供することにある。   The present invention has been made in view of the above circumstances, and one of the objects of the present invention is to provide a reactor that has a small number of components, can be firmly fixed to a case, and has excellent assembly workability.

本発明の一態様に係るリアクトルは、巻回部を有するコイルと、前記巻回部内に配置される部分を有する磁性コアと、前記巻回部と前記磁性コアとの間に介在される部分を有する介在部材と、前記コイルと前記磁性コアと前記介在部材との組合体を収納する有底容器状のケースと、を備える。前記介在部材は、固定部と、押付部と、を備える。固定部は、締結部材の貫通孔を有し、前記締結部材によって前記ケースの内底面側に締め付けられると共に、前記組合体を前記ケースに固定する。押付部は、前記固定部と一体に成形され、前記巻回部の内底面における前記ケースの内底面側の領域と前記磁性コアとの間に介在される部材であり、前記固定部の前記ケースへの固定に伴い、前記コイルを前記ケースの内底面に押し付ける。   A reactor according to an aspect of the present invention includes a coil having a winding portion, a magnetic core having a portion disposed in the winding portion, and a portion interposed between the winding portion and the magnetic core. An interposed member, and a bottomed container-like case that houses an assembly of the coil, the magnetic core, and the interposed member. The interposition member includes a fixing portion and a pressing portion. The fixing portion has a through hole of a fastening member, is fastened to the inner bottom surface side of the case by the fastening member, and fixes the combination to the case. The pressing portion is a member that is formed integrally with the fixed portion and is interposed between the inner core surface of the case and a region on the inner bottom surface side of the case and the magnetic core, and the case of the fixed portion The coil is pressed against the inner bottom surface of the case as it is fixed to the case.

上記リアクトルは、部品点数が少なく、組合体をケースに強固に固定でき、組立作業性に優れる。   The reactor has a small number of parts, can firmly fix the assembly to the case, and is excellent in assembling workability.

実施形態１に係るリアクトルの概略斜視図である。1 is a schematic perspective view of a reactor according to a first embodiment. 図１のリアクトルの（ＩＩ）−（ＩＩ）断面図である。It is (II)-(II) sectional drawing of the reactor of FIG. 実施形態１に係るリアクトルの概略分解斜視図である。1 is a schematic exploded perspective view of a reactor according to a first embodiment. 実施形態１に係るリアクトルに備わる組合体の概略分解斜視図である。FIG. 3 is a schematic exploded perspective view of an assembly provided in the reactor according to the first embodiment. 実施形態１に備わる介在部材の概略分解斜視図である。2 is a schematic exploded perspective view of an interposition member provided in Embodiment 1. FIG.

［本発明の実施形態の説明］
最初に、本発明の実施態様を列記して説明する。 [Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.

（１）本発明の実施形態に係るリアクトルは、巻回部を有するコイルと、前記巻回部内に配置される部分を有する磁性コアと、前記巻回部と前記磁性コアとの間に介在される部分を有する介在部材と、前記コイルと前記磁性コアと前記介在部材との組合体を収納する有底容器状のケースと、を備える。前記介在部材は、固定部と、押付部と、を備える。固定部は、締結部材の貫通孔を有し、前記締結部材によって前記ケースの内底面側に締め付けられると共に、前記組合体を前記ケースに固定する。押付部は、前記固定部と一体に成形され、前記巻回部の内底面における前記ケースの内底面側の領域と前記磁性コアとの間に介在される部材であり、前記固定部の前記ケースへの固定に伴い、前記コイルを前記ケースの内底面に押し付ける。   (1) The reactor which concerns on embodiment of this invention is interposed between the coil which has a winding part, the magnetic core which has a part arrange | positioned in the said winding part, and the said winding part and the said magnetic core. And a bottomed container-like case that houses an assembly of the coil, the magnetic core, and the interposed member. The interposition member includes a fixing portion and a pressing portion. The fixing portion has a through hole of a fastening member, is fastened to the inner bottom surface side of the case by the fastening member, and fixes the combination to the case. The pressing portion is a member that is formed integrally with the fixed portion and is interposed between the inner core surface of the case and a region on the inner bottom surface side of the case and the magnetic core, and the case of the fixed portion The coil is pressed against the inner bottom surface of the case as it is fixed to the case.

上記のリアクトルは、介在部材が固定部を備えることで、組合体の構成部材で組合体をケースに固定することができるため、ケースに対して組合体を配置し易く、リアクトルの組立作業性に優れる。固定部の貫通孔とケースに対する締結部材の取付部とを位置合わせして締結部材にて固定するだけで、組合体とケースとを位置決めした状態で容易に固定できるからである。また、ケースへの組合体の固定は、組合体の構成部材を利用して行っているため、従来のステーのような別部材を準備する必要がなく、部品点数を削減できる。   In the above reactor, the interposition member includes a fixing portion, so that the combined body can be fixed to the case with the constituent members of the combined body. Therefore, it is easy to arrange the combined body with respect to the case, and the assembly workability of the reactor is improved. Excellent. This is because it is possible to easily fix the assembly and the case in a positioned state simply by aligning the through-hole of the fixing portion and the attachment portion of the fastening member with respect to the case and fixing them with the fastening member. In addition, since the assembly is fixed to the case using the constituent members of the assembly, it is not necessary to prepare another member such as a conventional stay, and the number of parts can be reduced.

さらに、上記のリアクトルは、介在部材が押付部を備えることで、固定部のケースへの固定に伴って押付部がコイルをケースの底面側に押し付ける作用が働くため、コイルとケースの内底面とを接触した状態で容易に固定できる。コイルとケースの内底面とが接触することで、上記リアクトルは放熱性に優れる。押付部によってコイルをケースの内底面に押し付ける際、コイルとケースの内底面とが直接接触する場合もあるし、コイルとケースの内底面との間に放熱シートや接着剤などの介在物を介した間接接触の場合もある。   Furthermore, since the above-described reactor includes the pressing portion, the pressing portion presses the coil against the bottom surface of the case as the fixing portion is fixed to the case, so that the coil and the inner bottom surface of the case Can be easily fixed in contact. The reactor is excellent in heat dissipation because the coil and the inner bottom surface of the case are in contact with each other. When the coil is pressed against the inner bottom surface of the case by the pressing part, the coil and the inner bottom surface of the case may be in direct contact with each other, or an interposition such as a heat dissipation sheet or adhesive is interposed between the coil and the inner bottom surface of the case. Indirect contact may occur.

（２）上記のリアクトルの一例として、前記ケースは、有底四角筒状のケースであり、前記固定部は、前記ケースの各角部に向かって延びる舌片である形態が挙げられる。   (2) As an example of the above reactor, the case may be a bottomed rectangular tube case, and the fixed portion may be a tongue piece extending toward each corner of the case.

有底四角筒状のケースの場合、組合体とケースとの固定部分を、ケース内に形成される隙間となる角部に設定することで、ケースの大型化を抑制でき、リアクトルの大型化を抑制できる。固定部がケースの角部に向かって延びるような形状であることで、磁性コアのうち巻回部外に配置される外コア片の角部を固定部によって覆うことができるため、外コア片の角部の損傷を抑制し易い。   In the case of a square tube case with a bottom, by setting the fixed part of the assembly and the case to the corner that becomes the gap formed in the case, it is possible to suppress the enlargement of the case and increase the size of the reactor. Can be suppressed. Since the fixing portion has a shape extending toward the corner portion of the case, the corner portion of the outer core piece arranged outside the winding portion of the magnetic core can be covered with the fixing portion. It is easy to suppress damage to the corners.

（３）上記のリアクトルの一例として、前記固定部は、前記貫通孔側を自由端、その反対側を前記押付部側との連結端とする片持ち支持構造の板状片であり、前記介在部材は、前記固定部の自由端側の揺動を抑制する補強部を備える形態が挙げられる。   (3) As an example of the reactor, the fixing portion is a plate-like piece having a cantilever structure in which the through hole side is a free end and the opposite side is a connecting end with the pressing portion side, and the interposition A form with which the member is provided with the reinforcement part which suppresses rocking | fluctuation on the free end side of the said fixing | fixed part is mentioned.

固定部が貫通孔側を自由端とする片持ち支持構造の板状片である場合、固定部の自由端側の揺動を抑制する補強部を備えることで、固定部のケースへの固定に伴い、確実に押付部の押し付け作用を働かせることができる。固定部と押付部とが一体の剛体として挙動することで、固定部に作用する押し付け力を押付部からコイルに作用させ易いからである。よって、コイルとケースの内底面とを接触した状態で、組合体をケースに固定できる。   When the fixing part is a plate-like piece with a cantilever support structure with the through hole side as a free end, a fixing part is provided to suppress the swinging of the fixing part on the free end side, thereby fixing the fixing part to the case. As a result, the pressing action of the pressing portion can be made to work reliably. This is because the fixing portion and the pressing portion behave as an integral rigid body, so that the pressing force acting on the fixing portion is easily applied to the coil from the pressing portion. Therefore, the assembly can be fixed to the case while the coil and the inner bottom surface of the case are in contact with each other.

（４）上記のリアクトルの一例として、前記介在部材は、前記巻回部の軸方向に二分割される一対の分割介在部材を組み合わせて構成されており、前記一対の分割介在部材の一方は、前記押付部を含み、前記磁性コアのうち前記巻回部内に配置される内コア片及びギャップ材の全てを収納可能な筒状部を備える形態が挙げられる。   (4) As an example of the reactor described above, the interposition member is configured by combining a pair of split interposition members that are divided in the axial direction of the winding portion, and one of the pair of split interposition members is The form provided with the cylindrical part which can contain all the inner core pieces and gap materials which are included in the said winding part among the said magnetic cores including the said pressing part is mentioned.

上記構成によれば、筒状部が内コア片及びギャップ材の全てを収納することで、筒状部に対して内コア片及びギャップ材の位置決めが容易にでき、かつその位置決め状態を安定して確保することができる。また、内コア片及びギャップ材を筒状部に収納した状態で取り扱うことができるため、リアクトルの組立作業性に優れる。押付部は、巻回部内に配置される内コア片及びギャップ材の積層物の全長に亘って配置されている、つまりコイルの軸方向の全長に亘って配置されているため、押付部によるコイルのケースへの押し付けを安定して行うことができる。   According to the above configuration, since the cylindrical portion accommodates all of the inner core piece and the gap material, the inner core piece and the gap material can be easily positioned with respect to the cylindrical portion, and the positioning state is stabilized. Can be secured. Moreover, since the inner core piece and the gap material can be handled in a state of being accommodated in the cylindrical portion, the assembly workability of the reactor is excellent. Since the pressing portion is disposed over the entire length of the laminate of the inner core piece and the gap material disposed in the winding portion, that is, is disposed over the entire length in the axial direction of the coil, the coil by the pressing portion Can be stably pressed against the case.

（５）前記介在部材が一対の分割介在部材を組み合わせて構成される上記のリアクトルの一例として、前記一対の分割介在部材は、互いに係合する係合部を備える形態が挙げられる。   (5) As an example of the reactor in which the interposition member is configured by combining a pair of split interposition members, a form in which the pair of split interposition members include engaging portions that engage with each other is exemplified.

上記構成によれば、分割介在部材同士の係合が容易であり、係合した分割介在部材同士が位置ずれし難い。よって、分割介在部材同士の係合によってコイルと磁性コアも位置ずれし難く、組合体が取り扱い易く、リアクトルの組立作業性により優れる。   According to the above configuration, the divided interposition members can be easily engaged with each other, and the engaged divided interposition members are not easily displaced. Therefore, the coil and the magnetic core are not easily displaced by the engagement of the divided interposition members, the assembly is easy to handle, and the assembly workability of the reactor is excellent.

［本発明の実施形態の詳細］
本発明の実施形態の詳細を、以下に説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。図中の同一符号は、同一名称物を示す。 [Details of the embodiment of the present invention]
Details of the embodiment of the present invention will be described below. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included. The same code | symbol in a figure shows the same name thing.

＜実施形態１＞
図１〜図５を参照して、実施形態１のリアクトル１を説明する。 <Embodiment 1>
With reference to FIGS. 1-5, the reactor 1 of Embodiment 1 is demonstrated.

〔リアクトル〕
・全体構成
実施形態１のリアクトル１は、図１，２に示すように、巻線２ｗを螺旋状に巻回してなる巻回部２ａ，２ｂを有するコイル２と、巻回部２ａ，２ｂ内に配置される部分を有する磁性コア３と、巻回部２ａ，２ｂの内面と磁性コア３との間に介在される部分を有する介在部材５と、コイル２と磁性コア３と介在部材５との組合体１０を収納するケース４と、を備える。ここでは、リアクトル１は、ケース４内に充填され、組合体１０を封止する封止樹脂部６を備える。実施形態１のリアクトル１は、介在部材５によって、コイル２をケース４の内底面（底板部４０の内面）に接触させた状態で組合体１０をケース４に固定できる点を特徴の一つとする。以下、構成要素ごとに詳細に説明する。なお、以下の説明において、組合体１０をケース４内に設置したときの設置側（ケース４の底板部４０側）を下側、その対向側（ケース４の開口側）を上側とする。 [Reactor]
-Overall configuration As shown in FIGS. 1 and 2, the reactor 1 of the first embodiment includes a coil 2 having winding portions 2 a and 2 b formed by spirally winding a winding 2 w, and winding portions 2 a and 2 b. A magnetic core 3 having a portion disposed between the winding cores 2a and 2b, an intervening member 5 having a portion interposed between the magnetic core 3 and the coil 2, the magnetic core 3 and the interposing member 5. And a case 4 for housing the combined body 10. Here, the reactor 1 includes a sealing resin portion 6 that is filled in the case 4 and seals the combined body 10. The reactor 1 according to the first embodiment is characterized in that the combined body 10 can be fixed to the case 4 in a state where the coil 2 is in contact with the inner bottom surface of the case 4 (the inner surface of the bottom plate portion 40) by the interposed member 5. . Hereinafter, each component will be described in detail. In the following description, the installation side (the bottom plate 40 side of the case 4) when the assembly 10 is installed in the case 4 is the lower side, and the opposite side (the opening side of the case 4) is the upper side.

・コイル
コイル２は、図４に示すように、一本の連続する巻線２ｗを螺旋状に巻回して形成された一対の筒状の巻回部２ａ，２ｂと、両巻回部２ａ，２ｂを連結する連結部２ｒと、を備える。各巻回部２ａ，２ｂは、互いに同一の巻数、同一の巻回方向で中空筒状に形成され、各軸方向が平行になるように並列（横並び）されている。連結部２ｒは、両巻回部２ａ，２ｂを繋ぐＵ字状に屈曲された部分である。このコイル２は、接合部の無い一本の巻線を螺旋状に巻回して形成しても良いし、各巻回部２ａ，２ｂを別々の巻線により作製し、各巻回部２ａ，２ｂの巻線の端部同士を溶接や圧着などにより接合することで形成しても良い。コイル２の両端部は、巻回部２ａ，２ｂから適宜な方向に引き延ばされて、図示しない端子部材に接続される。この端子部材を介して、コイル２に電力供給を行なう電源などの外部装置が接続される。 -Coil As shown in FIG. 4, the coil 2 includes a pair of cylindrical winding portions 2a and 2b formed by spirally winding one continuous winding 2w, and both winding portions 2a, A connecting portion 2r for connecting 2b. Each winding part 2a, 2b is formed in a hollow cylinder shape with the same number of turns and the same winding direction, and is arranged in parallel (side by side) so that the respective axial directions are parallel. The connecting portion 2r is a portion bent in a U shape that connects the winding portions 2a and 2b. The coil 2 may be formed by spirally winding a single winding without a joint. Alternatively, the windings 2a and 2b may be formed by separate windings, and the windings 2a and 2b You may form by joining the edge parts of a coil | winding by welding or crimping | compression-bonding. Both end portions of the coil 2 are extended from the winding portions 2a and 2b in an appropriate direction and connected to a terminal member (not shown). An external device such as a power source for supplying power is connected to the coil 2 through the terminal member.

本実施形態の各巻回部２ａ，２ｂは角筒状に形成されている。角筒状の巻回部２ａ，２ｂとは、その端面形状が四角形状（正方形状を含む）の角を丸めた形状の巻回部のことである。もちろん、巻回部２ａ，２ｂは円筒状に形成しても構わない。円筒状の巻回部とは、その端面形状が閉曲面形状（楕円形状や真円形状、レーストラック形状など）の巻回部のことである。   Each winding part 2a, 2b of this embodiment is formed in the shape of a square tube. The rectangular cylindrical winding parts 2a and 2b are winding parts having rounded corners whose end face shape is a quadrangle (including a square shape). Of course, the winding portions 2a and 2b may be formed in a cylindrical shape. The cylindrical winding portion is a winding portion whose end face shape is a closed curved surface shape (an elliptical shape, a perfect circle shape, a race track shape, etc.).

巻回部２ａ，２ｂを含むコイル２は、銅やアルミニウム、マグネシウム、あるいはその合金といった導電性材料からなる平角線や丸線などの導体の外周に、絶縁性材料からなる絶縁被覆を備える被覆線によって構成することができる。本実施形態では、導体が銅製の平角線からなり、絶縁被覆がエナメル（代表的にはポリアミドイミド）からなる被覆平角線をエッジワイズ巻きにすることで、各巻回部２ａ，２ｂを形成している。   The coil 2 including the winding portions 2a and 2b is a coated wire having an insulating coating made of an insulating material on the outer periphery of a conductor such as a flat wire or a round wire made of a conductive material such as copper, aluminum, magnesium, or an alloy thereof. Can be configured. In the present embodiment, the winding portions 2a and 2b are formed by edgewise winding a rectangular wire made of copper and a conductor made of enamel (typically polyamideimide). Yes.

・磁性コア
磁性コア３は、図４に示すように、複数の柱状の内コア片３１ｍ，…と、Ｕ字状の一対の外コア片３２ｍ，３２ｍと、各コア片間に介在される複数のギャップ材３１ｇ，…と、を備える。内コア片３１ｍ，…は、巻回部２ａ，２ｂ内に全体が配置される磁性片であり、外コア片３２ｍ，３２ｍは、巻回部２ａ，２ｂ外に配置される部分を有する磁性片のことである。外コア片３２ｍ，３２ｍは、巻回部２ａ，２ｂ内に部分的に配置される部分を有していてもよく、この例では、外コア片３２，３２ｍは、巻回部２ａ，２ｂ外に配置される部分と、巻回部２ａ，２ｂ内に配置される部分との双方を有する。外コア片３２ｍ，３２ｍは、Ｕ字の開口部が向かい合うように配置され、内コア片３１ｍ，…とギャップ材３１ｇ…との積層物が、外コア片３２ｍ，３２ｍ間に横並び（並列）に配置される。この配置によって、磁性コア３は環状に組み付けられ、コイル２を励磁したときに閉磁路を形成する。 Magnetic core 3 includes a plurality of columnar inner core pieces 31m,..., A pair of U-shaped outer core pieces 32m and 32m, and a plurality of magnetic cores 3 interposed between the core pieces, as shown in FIG. The gap members 31g, ... are provided. The inner core pieces 31m,... Are magnetic pieces that are entirely disposed within the winding portions 2a, 2b, and the outer core pieces 32m, 32m are magnetic pieces having portions that are disposed outside the winding portions 2a, 2b. That is. The outer core pieces 32m and 32m may have a portion partially disposed in the winding portions 2a and 2b. In this example, the outer core pieces 32 and 32m are outside the winding portions 2a and 2b. And a portion disposed in the winding portions 2a and 2b. The outer core pieces 32m, 32m are arranged so that the U-shaped openings face each other, and a laminate of the inner core pieces 31m,... And the gap material 31g, is arranged side by side (in parallel) between the outer core pieces 32m, 32m. Be placed. With this arrangement, the magnetic core 3 is assembled in an annular shape, and forms a closed magnetic path when the coil 2 is excited.

・・内コア片
内コア片３１ｍは、巻回部２ａ，２ｂの形状に合わせた形状であることが好ましい。ここでは、図４に示すように、内コア片３１ｍの形状は直方体状であり、その角部は、巻回部２ａ，２ｂの内周面の角部に沿って丸められている。内コア片３１ｍの個数は、適宜選択できる。 .. Inner core piece The inner core piece 31m preferably has a shape that matches the shape of the winding portions 2a and 2b. Here, as shown in FIG. 4, the shape of the inner core piece 31m is a rectangular parallelepiped shape, and the corners thereof are rounded along the corners of the inner peripheral surfaces of the winding portions 2a and 2b. The number of inner core pieces 31m can be selected as appropriate.

・・外コア片
一対の外コア片３２ｍ，３２ｍは、同一の形状であり、図４の上方から見て略Ｕ字状である。外コア片３２ｍは、巻回部２ａ，２ｂ外に配置されて巻回部２ａ，２ｂ間に跨るように配置される直方体状の外コア基部３２１と、この外コア基部３２１から突出して巻回部２ａ，２ｂ内にそれぞれ配置される一対の突出部３２２と、を有する。外コア基部３２１と一対の突出部３２２，３２２とは一体に成形された一体物である。また、ここでは、外コア基部３２１は、一対の突出部３２２，３２２とは反対側に突出する部分が一体に成形されている。この突出する部分の横断面積は内コア片３１ｍや突出部３２２の横断面積と実質的に同一である。上記一対の突出部３２２，３２２の端面は、内コア片３１ｍの端面とほぼ同じ形状及び大きさであり、その大きさ及び突出長さは、コイル２に応じた所定の磁路断面積を有するように適宜選択できる。一対の突出部３２２，３２２は、巻回部２ａ，２ｂの形状に合わせた形状であることが好ましく、ここでは、角部が実質的に巻回部２ａ，２ｂの内周面の角部に沿って丸められている。 .. Outer core piece The pair of outer core pieces 32m, 32m have the same shape and are substantially U-shaped when viewed from above in FIG. The outer core piece 32m is a rectangular parallelepiped outer core base 321 disposed outside the winding portions 2a and 2b and straddling between the winding portions 2a and 2b, and is wound around the outer core base 321. A pair of protrusions 322 disposed in the portions 2a and 2b, respectively. The outer core base portion 321 and the pair of projecting portions 322 and 322 are integrally formed. Further, here, the outer core base 321 is integrally formed with a portion protruding to the opposite side of the pair of protruding portions 322 and 322. The cross-sectional area of the protruding portion is substantially the same as the cross-sectional area of the inner core piece 31m and the protruding portion 322. The end surfaces of the pair of projecting portions 322 and 322 have substantially the same shape and size as the end surface of the inner core piece 31m, and the size and projecting length have a predetermined magnetic path cross-sectional area corresponding to the coil 2. Can be selected as appropriate. The pair of protrusions 322 and 322 preferably have a shape that matches the shape of the winding portions 2a and 2b. Here, the corners are substantially at the corners of the inner peripheral surfaces of the winding portions 2a and 2b. Rounded along.

Ｕ字状の外コア片３２ｍ，３２ｍにおける外コア基部３２１の下面は、内コア片３１ｍの下面よりも突出しており、コイル２と磁性コア３とを組み付けると、外コア基部３２１の下面は、コイル２の下面と面一となる。即ち、組合体１０の設置面は、コイル２の一面（下面）と、磁性コア３の外コア片３２ｍの一面（外コア基部３２１の下面）によって構成される。そのため、リアクトル１は、組合体１０がケース４の底板部４０に安定して配置される上、コイル２に加えて磁性コア３の一部もケース４の底板部４０に接触することにより、放熱性を高められる。   The lower surface of the outer core base 321 in the U-shaped outer core pieces 32m, 32m protrudes from the lower surface of the inner core piece 31m. When the coil 2 and the magnetic core 3 are assembled, the lower surface of the outer core base 321 is It is flush with the lower surface of the coil 2. That is, the installation surface of the combined body 10 is configured by one surface (lower surface) of the coil 2 and one surface of the outer core piece 32m of the magnetic core 3 (lower surface of the outer core base portion 321). Therefore, the reactor 1 is configured such that the combined body 10 is stably disposed on the bottom plate portion 40 of the case 4, and a part of the magnetic core 3 is also in contact with the bottom plate portion 40 of the case 4 in addition to the coil 2. Increases sex.

この例では、内コア片３１ｍ及び外コア片３２ｍは、いずれも圧粉成形体である。圧粉成形体は、代表的には、鉄や鉄合金（Ｆｅ−Ｓｉ合金、Ｆｅ−Ｎｉ合金など）といった軟磁性の金属の粉末と、適宜バインダ（樹脂など）や潤滑剤とを含む原料粉末を成形した後、成形に伴う歪みの除去などを目的とした熱処理を施して得られる。金属粉末に絶縁処理を施した被覆粉末や、金属粉末と絶縁材とを混合した混合粉末を原料粉末に用いることで、成形後、金属粒子と金属粒子間に介在する絶縁材とによって実質的に構成される圧粉成形体が得られる。この圧粉成形体は、絶縁材を含むことで、渦電流を低減できて低損失である。   In this example, both the inner core piece 31m and the outer core piece 32m are compacted bodies. The green compact is typically a raw material powder containing a soft magnetic metal powder such as iron or an iron alloy (Fe-Si alloy, Fe-Ni alloy, etc.) and a binder (resin etc.) or a lubricant as appropriate. After being molded, it is obtained by performing a heat treatment for the purpose of removing distortion associated with the molding. By using, as a raw material powder, a coating powder obtained by subjecting a metal powder to insulation treatment, or a mixed powder obtained by mixing a metal powder and an insulating material, the metal powder and the insulating material interposed between the metal particles after forming are substantially used. A compacted green body is obtained. Since this compacting body contains an insulating material, eddy current can be reduced and the loss is low.

・・ギャップ材
ギャップ材３１ｇは、コア片３１ｍ，３２ｍよりも比透磁率が低い材料、代表的にはアルミナなどの非磁性材で構成される。この例では、ギャップ材３１ｇは、平面視長方形状の非磁性材の平板としている。ギャップ材３１ｇの形状や個数は適宜選択できる。各コア片３１ｍ，３２ｍ間に介在されるギャップ材３１ｇは、そのギャップ材３１ｇに代えて、又はギャップ材３１ｇと併用してエアギャップとすることができる。 .. Gap material The gap material 31g is made of a material having a lower relative permeability than the core pieces 31m and 32m, typically a non-magnetic material such as alumina. In this example, the gap material 31g is a non-magnetic material flat plate having a rectangular shape in plan view. The shape and number of the gap material 31g can be selected as appropriate. The gap material 31g interposed between the core pieces 31m and 32m can be used as an air gap instead of the gap material 31g or in combination with the gap material 31g.

・介在部材
介在部材５は、コイル２（巻回部２ａ，２ｂ）と磁性コア３との間に介在され、コイル２と磁性コア３との間を絶縁する部材である。介在部材５は、図４，５に示すように、コイル２（巻回部２ａ，２ｂ）の軸方向に二分割される一対の分割介在部材５Ａ，５Ｂを備える。介在部材５は、一対の分割介在部材５Ａ，５Ｂを組み合わせたとき、巻回部２ａ，２ｂ内に配置される内側介在部５１と、巻回部２ａ，２ｂと外コア片３２ｍとの間に介在される端面介在部５２と、巻回部２ａ，２ｂの軸方向外方に延出して外コア片３２ｍの上面に配置される延出部５３と、を備える。ここでは、分割介在部材５Ａは、内側介在部５１と端面介在部５２と延出部５３とが一体に成形されており、分割介在部材５Ｂは、端面介在部５２と延出部５３とが一体に成形されている。 Interposing member The interposing member 5 is a member that is interposed between the coil 2 (winding portions 2 a and 2 b) and the magnetic core 3 and insulates the coil 2 from the magnetic core 3. As shown in FIGS. 4 and 5, the interposed member 5 includes a pair of divided interposed members 5 </ b> A and 5 </ b> B that are divided into two in the axial direction of the coil 2 (winding portions 2 a and 2 b). When the interposition member 5 is combined with the pair of split interposition members 5A and 5B, the interposition member 51 is disposed between the winding portions 2a and 2b, and between the winding portions 2a and 2b and the outer core piece 32m. An interposing end face interposition part 52 and an extension part 53 extending outward in the axial direction of the winding parts 2a and 2b and arranged on the upper surface of the outer core piece 32m are provided. Here, in the split interposition member 5A, the inner interposition part 51, the end face interposition part 52, and the extension part 53 are integrally formed, and in the split interposition member 5B, the end face interposition part 52 and the extension part 53 are integrally formed. It is molded into.

内側介在部５１は、巻回部２ａ，２ｂの内底面におけるケース４の底板部４０側の領域と磁性コア３との間に介在される押付部５１ｐを有する。延出部５３は、組合体１０をケース４に固定する固定部５３ｆを備える。実施形態１のリアクトル１は、固定部５３ｆのケース４への固定に伴って、押付部５１ｐがコイル２をケース４の底板部４０側に押し付ける点を特徴の一つとする。   The inner interposed portion 51 has a pressing portion 51p interposed between the magnetic core 3 and the region on the bottom plate portion 40 side of the case 4 on the inner bottom surface of the winding portions 2a and 2b. The extending portion 53 includes a fixing portion 53 f that fixes the combined body 10 to the case 4. The reactor 1 of the first embodiment is characterized in that the pressing portion 51p presses the coil 2 against the bottom plate portion 40 side of the case 4 as the fixing portion 53f is fixed to the case 4.

・・内側介在部（固定部）
内側介在部５１は、内コア片３１ｍ，…とギャップ材３１ｇ，…との積層物を収納可能な筒状部である。ここでは、内側介在部５１は、積層物の４つの角部のそれぞれに対応するように、４つの湾曲した介在片５１ｆから構成されている。各介在片５１ｆが積層物の各角部に沿うように湾曲していることで、内側介在部５１に積層物を収納し易くなっている。内側介在部５１は、４つの介在片５１ｆ，…によって形成される横断面形状が内コア片３１ｍの外形に沿った筒状となっている。各介在片５１ｆは、端面介在部５２側の一端部で繋がった枠状となるように形成されている。つまり、内側介在部５１は、筒状部の側面に、筒状部の軸方向の一端側が開口し、他端側（端面介在部５２側）が閉塞されたスリットが形成されている。内側介在部５１にスリットが形成されていることで、各内コア片３１ｍ，…及びギャップ材３１ｇ，…を把持した状態でスリットの開口側から内側介在部５１内に挿入させることができ、収納作業が行い易い。 ..Inner intervention part (fixed part)
The inner interposition part 51 is a cylindrical part that can accommodate a laminate of the inner core pieces 31m,... And the gap material 31g,. Here, the inner interposition part 51 is composed of four curved interposition pieces 51f so as to correspond to the four corners of the laminate. Each interposed piece 51f is curved so as to follow each corner of the laminate, so that the laminate can be easily stored in the inner interposed portion 51. The inner interposition part 51 has a cylindrical cross section formed by the four interposition pieces 51f,... Along the outer shape of the inner core piece 31m. Each interposition piece 51f is formed to have a frame shape connected at one end on the end surface interposition part 52 side. That is, the inner interposition part 51 is formed with a slit in which one end side in the axial direction of the tubular part is opened and the other end side (end face interposition part 52 side) is closed on the side surface of the tubular part. Since the inner interposition part 51 is formed with a slit, it can be inserted into the inner interposition part 51 from the opening side of the slit in a state where each inner core piece 31m,... And the gap material 31g,. Easy to work.

内側介在部５１のうち、巻回部２ａ，２ｂの内底面におけるケース４の底板部４０側の領域と磁性コア３との間に介在される介在片５１ｆが、後述する固定部５３ｆによるケース４への固定に伴って、コイル２をケース４の底板部４０側に押し付ける役割を果たす押付部５１ｐである（図２，５を参照）。この固定部５３ｆと押付部５１ｐとの関係については、後述のリアクトルの製造方法で説明する。   Among the inner intervening portions 51, an intervening piece 51f interposed between a region on the bottom plate portion 40 side of the case 4 on the inner bottom surface of the winding portions 2a and 2b and the magnetic core 3 is a case 4 formed by a fixing portion 53f described later. This is a pressing portion 51p that plays a role of pressing the coil 2 against the bottom plate portion 40 side of the case 4 as it is fixed to (see FIGS. 2 and 5). The relationship between the fixing portion 53f and the pressing portion 51p will be described in the reactor manufacturing method described later.

内側介在部５１の上側に配置された二つの介在片５１ｆの先端部分には、分割介在部材５Ｂの端面介在部５２に形成された係合部５２ｅと係合する係合部５１ｅが形成されている。分割介在部材５Ａの内側介在部５１（各介在片５１ｆ）の係合部５１ｅと、分割介在部材５Ｂの端面介在部５２の係合部５２ｅとを係合することで、分割介在部材５Ａ，５Ｂが互いに位置決めされた状態で一体化できる。両者の係合については、後述する。   An engaging portion 51e that engages with an engaging portion 52e formed on the end surface interposed portion 52 of the split interposed member 5B is formed at the distal end portion of the two interposed pieces 51f disposed on the upper side of the inner interposed portion 51. Yes. By engaging the engaging portion 51e of the inner interposed portion 51 (each interposed piece 51f) of the divided interposing member 5A with the engaging portion 52e of the end surface interposed portion 52 of the divided interposing member 5B, the divided interposing members 5A and 5B are engaged. Can be integrated in a state of being positioned with respect to each other. The engagement between the two will be described later.

・・端面介在部
端面介在部５２は、外コア片３２ｍの一対の突出部３２２，３２２がそれぞれ配置される上面開口したＥ字状部材である。このＥ字状部材の開口部分に後述する延出部５３が配置されることで、上記突出部３２２，３２２が挿通可能な二つの挿通孔５２ｈ、５２ｈを有するＢ字状の枠状部となる。分割介在部材５Ａに備わる端面介在部５２は、巻回部２ａ，２ｂと対面する側の面に、上記内側介在部５１と、仕切り部５２ｄと、センサ保持部５２ｓと、が一体に成形されており、外コア片３２ｍと対面する側の面に、後述する延出部５３が一体に成形されている。分割介在部材５Ｂに備わる端面介在部５２は、巻回部２ａ，２ｂと対面する側の面に、分割介在部材５Ａと係合する係合部５２ｅと、仕切り部５２ｄと、が一体に成形されており、外コア片３２ｍと対面する側の面に、後述する延出部５３が一体に成形されている。 ..End surface interposed portion The end surface interposed portion 52 is an E-shaped member having an open top surface on which the pair of projecting portions 322 and 322 of the outer core piece 32m are respectively disposed. By disposing an extension portion 53 described later in the opening portion of the E-shaped member, a B-shaped frame-like portion having two insertion holes 52h and 52h through which the protrusions 322 and 322 can be inserted is obtained. . The end surface interposition part 52 provided in the split interposition member 5A is formed by integrally forming the inner interposition part 51, the partition part 52d, and the sensor holding part 52s on the surface facing the winding parts 2a and 2b. In addition, an extending portion 53 described later is integrally formed on the surface facing the outer core piece 32m. The end surface interposed portion 52 provided in the divided interposing member 5B is integrally formed with an engaging portion 52e that engages with the divided interposing member 5A and a partition portion 52d on the surface facing the winding portions 2a and 2b. An extending portion 53 described later is integrally formed on the surface facing the outer core piece 32m.

この例では、外コア片３２ｍ，３２ｍがＵ字状であるため、外コア片３２ｍの突出部３２２，３２２を端面介在部５２の挿通孔５２ｈ，５２ｈに挿通することで、介在部材５に対して外コア片３２ｍの位置決めを容易に行える。つまり、内コア片３１ｍ，…及びギャップ材３１ｇ，…と外コア片３２ｍ，３２ｍの位置決め、磁性コア３とコイル２との位置決めも容易に行える。   In this example, since the outer core pieces 32m and 32m are U-shaped, the protruding portions 322 and 322 of the outer core piece 32m are inserted into the insertion holes 52h and 52h of the end surface interposed portion 52, so that Thus, the outer core piece 32m can be easily positioned. That is, positioning of the inner core pieces 31m,... And the gap members 31g,... And the outer core pieces 32m, 32m and positioning of the magnetic core 3 and the coil 2 can be easily performed.

仕切り部５２ｄは、内側介在部５１，５１間の位置で、端面介在部５２のコイル２側の面から突出するように設けられている。この仕切り部５２ｄは、分割介在部材５Ａ，５Ｂを巻回部２ａ，２ｂに組み付けたときに、巻回部２ａ，２ｂ間に介在され、巻回部２ａ，２ｂの隔離状態を保持する。この隔離によって、巻回部２ａ，２ｂ間の絶縁を確保することができる。この仕切り部５２ｄは、分割介在部材５Ａ，５Ｂの双方に設けられている。   The partition part 52d is provided at a position between the inner interposed parts 51 and 51 so as to protrude from the surface of the end face interposed part 52 on the coil 2 side. This partition part 52d is interposed between the winding parts 2a and 2b when the divided interposing members 5A and 5B are assembled to the winding parts 2a and 2b, and maintains the isolated state of the winding parts 2a and 2b. By this isolation, the insulation between the winding parts 2a and 2b can be ensured. This partition part 52d is provided on both of the split interposing members 5A and 5B.

分割介在部材５Ａに設けられているセンサ保持部５２ｓは、上記仕切り部５２ｄの上端側からコイル２の軸方向に連続して、端面介在部５２のコイル２側の面から突出するように設けられている。このセンサ保持部５２ｓは、巻回部２ａ，２ｂの対向する各角Ｒ部によって形成される空間にセンサ（図示せず）を載置して、分割介在部材５Ａ，５Ｂを巻回部２ａ，２ｂに組み付けたときに、上記センサの上側をセンサ保持部５２ｓによって覆うことができ、センサの固定や保護を行うことができる。センサとしては、温度センサ、電流センサなどのリアクトル１の物理量を測定するセンサが挙げられる。   The sensor holding part 52s provided in the split interposition member 5A is provided so as to protrude from the coil 2 side surface of the end face interposition part 52 continuously from the upper end side of the partition part 52d in the axial direction of the coil 2. ing. The sensor holding part 52s places a sensor (not shown) in a space formed by the opposite corners R of the winding parts 2a and 2b, and connects the divided interposing members 5A and 5B to the winding parts 2a and 5b. When assembled to 2b, the upper side of the sensor can be covered with the sensor holding portion 52s, and the sensor can be fixed and protected. Examples of the sensor include a sensor that measures a physical quantity of the reactor 1 such as a temperature sensor or a current sensor.

分割介在部材５Ｂに設けられている係合部５２ｅは、端面介在部５２のコイル２側の面から突出するように設けられており、この突出部分（凸状部分）が、分割介在部材５Ａ（内側介在部５１）に形成された凹状の係合部５１ｅと係合する。係合部５２ｅは、内側介在部５１に形成された係合部５１ｅに対応して形成されており、挿通孔５２ｈ，５２ｈごとに、その挿通孔５２ｈの上面に］状の突状片と、両側面に板状の突状片が形成されている。］状の係合部５２ｅは、分割介在部材５Ａの内側介在部５１の上側に配置された二つの介在片５１ｆの先端に設けられた係合部５１ｅに係合し、二つの板状の係合部５２ｅは、分割介在部材５Ａの内側介在部５１の側面に形成されたスリット（係合部５１ｅ）に係合する。分割介在部材５Ａ，５Ｂを係合部５１ｅ，５２ｅで係合すると、その係合部分は、周方向における下面の中央部分が開口しており、横断面がＣ字状となる。各巻回部２ａ，２ｂ内に内コア片３１ｍ，…とギャップ材３１ｇ，…との積層物を装入した分割介在部材５Ａ，５Ｂを巻回部２ａ，２ｂに組み付けたときに、挿通孔５２ｈ，５２ｈの下面側には］状の係合部が存在しないため開口部が形成されることとなり、この開口部が樹脂の流路となる。よって、組合体１０をケース４に収納し、ケース４内に後述する封止樹脂部６の未固化の構成樹脂を充填する際に、この開口部からコイル２と磁性コア３との間にまで封止樹脂部６の未固化の構成樹脂を充填することができる。   The engaging part 52e provided in the split interposing member 5B is provided so as to protrude from the surface of the end face interposing part 52 on the coil 2 side, and this protruding part (convex part) is provided in the split interposing member 5A ( It engages with a concave engaging part 51e formed in the inner interposition part 51). The engaging portion 52e is formed corresponding to the engaging portion 51e formed in the inner interposition portion 51, and for each of the insertion holes 52h, 52h, on the upper surface of the insertion hole 52h, Plate-shaped protruding pieces are formed on both side surfaces. ] -Shaped engaging portion 52e engages with an engaging portion 51e provided at the tip of two interposing pieces 51f arranged above the inner interposing portion 51 of the split interposing member 5A, and two plate-like engaging portions. The joint portion 52e engages with a slit (engagement portion 51e) formed on the side surface of the inner interposition portion 51 of the split interposition member 5A. When the divided interposing members 5A and 5B are engaged by the engaging portions 51e and 52e, the engaging portion is opened at the center portion of the lower surface in the circumferential direction, and the cross section is C-shaped. When the split interposition members 5A and 5B in which the laminate of the inner core pieces 31m, ... and the gap material 31g, ... are assembled in the winding parts 2a, 2b are assembled to the winding parts 2a, 2b, the insertion holes 52h , 52h on the lower surface side] there is no engagement portion, so an opening is formed, and this opening becomes a resin flow path. Therefore, when the assembly 10 is housed in the case 4 and the case 4 is filled with an unsolidified constituent resin of the sealing resin portion 6 to be described later, from this opening to the space between the coil 2 and the magnetic core 3. It is possible to fill the unsolidified constituent resin of the sealing resin portion 6.

・・延出部（固定部）
延出部５３は、端面介在部５２の上端に連続して、外コア片３２ｍが配置される側に延出するように設けられている。延出部５３は、外コア片３２ｍの外コア基部３２１の厚さ方向及び幅方向に延びる板状部材である。ここでは、分割介在部材５Ａの延出部５３は、外コア基部３２１の最大厚さの１／３程度まで全幅に亘って延出しており、それよりも外方には、ケース４の角部に向かって二股に分かれて延出している。このとき、二股に分かれて延出する部分は、外コア片３２ｍの外コア基部３２１の幅方向の中央線を挟んで対称形状であることが好ましい。分割介在部材５Ｂの延出部５３は、外コア基部３２１の最大厚さの２／３程度まで全幅に亘って延出しており、それよりも外方には、ケース４の角部に向かって二股に分かれて延出している。分割介在部材５Ｂが配置される側には、コイル２の連結部２ｒが外コア基部３２１の上方に配置されるため、分割介在部材５Ｂの延出部５３は、分割介在部材５Ａよりも広くなっている。 ..Extending part (fixed part)
The extending portion 53 is provided so as to extend to the side where the outer core piece 32m is disposed, continuously from the upper end of the end surface interposed portion 52. The extending portion 53 is a plate-like member extending in the thickness direction and the width direction of the outer core base portion 321 of the outer core piece 32m. Here, the extending portion 53 of the split interposing member 5A extends over the entire width up to about 1/3 of the maximum thickness of the outer core base portion 321, and the corner portion of the case 4 is further outward than that. It is divided into two forks. At this time, it is preferable that the portion that is divided into two and extends is symmetrical with respect to the center line in the width direction of the outer core base portion 321 of the outer core piece 32m. The extending portion 53 of the split interposing member 5B extends over the entire width up to about 2/3 of the maximum thickness of the outer core base portion 321, and outwardly toward the corner portion of the case 4. It extends into two branches. Since the connecting portion 2r of the coil 2 is disposed above the outer core base 321 on the side where the divided interposing member 5B is disposed, the extending portion 53 of the divided interposing member 5B is wider than the divided interposing member 5A. ing.

延出部５３は、その外方に二股に分かれた先端部分に、ボルトなどの締結部材９（図１，３）によってケース４の底板部４０側に締め付けられる平板状の固定部５３ｆを備える。固定部５３ｆには、締結部材９が貫通する貫通孔５３ｈが形成されている。この貫通孔５３ｈをケース４に形成された取付穴４５ｈ（図３）と位置合わせして締結部材９にて固定することで、組合体１０はケース４に固定される。   The extending portion 53 is provided with a flat plate-like fixing portion 53f that is fastened to the bottom plate portion 40 side of the case 4 by a fastening member 9 such as a bolt (FIGS. 1 and 3) at a tip portion that is bifurcated outwardly. A through hole 53h through which the fastening member 9 passes is formed in the fixing portion 53f. The combined body 10 is fixed to the case 4 by aligning the through hole 53h with the mounting hole 45h (FIG. 3) formed in the case 4 and fixing the through hole 53h with the fastening member 9.

延出部５３は、外コア片３２ｍの外コア基部３２１の全面に亘って覆う必要はなく、組合体１０をケース４に固定できる程度の大きさであればよい。そうすることで、介在部材５を構成する材料を抑えることができる。   The extending portion 53 does not need to cover the entire surface of the outer core base portion 321 of the outer core piece 32m, and may have a size that can fix the combined body 10 to the case 4. By doing so, the material which comprises the interposed member 5 can be suppressed.

この例では、固定部５３ｆは、一端側（端面介在部５２側）が支持端であり、他端側（先端の貫通孔５３ｈ側）が開放された自由端となる片持ち支持構造となっている（図５を参照）。片持ち支持構造の場合、貫通孔５３ｈに締結部材９を貫通して締め付けると、固定部５３ｆは不安定となる虞がある。そこで、各分割介在部材５Ａ，５Ｂには、図５に示すように、固定部５３ｆの自由端側の揺動を抑制する補強部５４が一体に成形されている。ここでは、補強部５４は、固定部５３ｆの下側の面（ケース４の底板部４０側の面）から端面介在部５２に向かう方向及び押付部５１ｐに向かう方向に延在した三角形状に形成されている。端面介在部５２には押付部５１ｐが一体に成形されているため、補強部５４を備えることで、固定部５３ｆのケース４への固定に伴い、押付部５１ｐがコイル２をケース４の底板部４０側に押し付ける作用を確実に働かせることができる。   In this example, the fixed portion 53f has a cantilever support structure in which one end side (the end surface interposed portion 52 side) is a support end and the other end side (the through hole 53h side at the tip) is a free end. (See FIG. 5). In the case of a cantilever support structure, if the fastening member 9 is passed through and tightened into the through hole 53h, the fixing portion 53f may become unstable. Therefore, as shown in FIG. 5, a reinforcing portion 54 that suppresses the swinging of the fixed portion 53f on the free end side is integrally formed on each of the split interposed members 5A and 5B. Here, the reinforcing portion 54 is formed in a triangular shape extending from the lower surface of the fixing portion 53f (the surface on the bottom plate portion 40 side of the case 4) toward the end surface interposed portion 52 and toward the pressing portion 51p. Has been. Since the pressing portion 51p is formed integrally with the end surface interposition portion 52, the reinforcing portion 54 is provided so that the pressing portion 51p causes the coil 2 to move the coil 2 to the bottom plate portion of the case 4 as the fixing portion 53f is fixed to the case 4. The action of pressing on the 40 side can be made to work reliably.

この例では、固定部５３ｆは、外コア片３２ｍの外コア基部３２１の角部の上方に位置するように形成されているため、その角部の損傷を抑制することもできる。   In this example, the fixing portion 53f is formed so as to be positioned above the corner portion of the outer core base portion 321 of the outer core piece 32m, so that damage to the corner portion can also be suppressed.

介在部材５の構成材料には、例えば、ポリフェニレンスルフィド（ＰＰＳ）樹脂、ポリテトラフルオロエチレン（ＰＴＦＥ）樹脂、液晶ポリマー（ＬＣＰ）、ナイロン６、ナイロン６６といったポリアミド（ＰＡ）樹脂、ポリブチレンテレフタレート（ＰＢＴ）樹脂、アクリロニトリル・ブタジエン・スチレン（ＡＢＳ）樹脂などの熱可塑性樹脂を利用することができる。その他、不飽和ポリエステル樹脂、エポキシ樹脂、ウレタン樹脂、シリコーン樹脂などの熱硬化性樹脂を利用することも可能である。介在部材５は、上記の樹脂を射出成形するなど、公知の成形方法によって容易に製造できる。   Examples of the constituent material of the interposition member 5 include polyphenylene sulfide (PPS) resin, polytetrafluoroethylene (PTFE) resin, liquid crystal polymer (LCP), nylon 6 and nylon 66, polyamide (PA) resin, polybutylene terephthalate (PBT), and the like. ) Resin and thermoplastic resins such as acrylonitrile / butadiene / styrene (ABS) resin can be used. In addition, thermosetting resins such as unsaturated polyester resins, epoxy resins, urethane resins, and silicone resins can be used. The interposition member 5 can be easily manufactured by a known molding method such as injection molding of the above resin.

・ケース
ケース４は、図３に示すように、組合体１０が載置される平板状の底板部４０と、組合体１０の周囲を囲むように底板部４０から立設される略矩形枠状の側壁部４１とを有し、底板部４０とは反対側（上側）が開口した有底容器状である。リアクトル１は、ケース４に組合体１０を収納することよって、組合体１０の外部環境(粉塵や腐食など)からの保護や機械的保護を図ることができる。この例では、ケース４の底板部４０の下面が冷却ベースといった設置対象（図示せず）の上面に接するように固定され、リアクトル１が設置対象上に設置される。図１では、底板部４０が下方となる設置状態を示すが、底板部４０が上方、又は側方となる設置状態もあり得る。 Case As shown in FIG. 3, the case 4 has a flat bottom plate portion 40 on which the combined body 10 is placed and a substantially rectangular frame shape standing from the bottom plate portion 40 so as to surround the periphery of the combined body 10. It is a bottomed container shape which has the side wall part 41 of this and opened on the opposite side (upper side) with the baseplate part 40. The reactor 1 can be protected from the external environment (dust, corrosion, etc.) and mechanical protection of the combination 10 by housing the combination 10 in the case 4. In this example, the bottom surface of the bottom plate portion 40 of the case 4 is fixed so as to contact the upper surface of an installation target (not shown) such as a cooling base, and the reactor 1 is installed on the installation target. Although FIG. 1 shows an installation state in which the bottom plate portion 40 is downward, there may be an installation state in which the bottom plate portion 40 is upward or sideward.

ケース４の四隅には、組合体１０をケース４に取り付けるための取付部４５を備える。この取付部４５には、ボルトなどの締結部材９が挿通される取付穴４５ｈが形成されている。この取付穴４５ｈと固定部５３ｆの貫通孔５３ｈとを位置合わせして、取付穴４５ｈと貫通孔５３ｈに締結部材９を貫通して締結することで、組合体１０はケース４に固定される。   At the four corners of the case 4, attachment portions 45 for attaching the combination 10 to the case 4 are provided. The mounting portion 45 is formed with a mounting hole 45h through which a fastening member 9 such as a bolt is inserted. The assembly 10 is fixed to the case 4 by aligning the mounting hole 45h and the through hole 53h of the fixing portion 53f, and by fastening the fastening member 9 through the mounting hole 45h and the through hole 53h.

この例に示すケース４は、底板部４０と側壁部４１とが一体に成形された金属製のケースである。一般に、金属は熱伝導率が比較的高いので、金属製のケースであれば、その全体を放熱経路に利用でき、組合体１０に発生した熱を外部の設置対象（例えば、冷却ベース）に効率良く放熱でき、リアクトル１の放熱性を高められる。ケース４の構成材料としては、例えば、アルミニウムやその合金、マグネシウムやその合金、銅やその合金、銀やその合金、鉄やオーステナイト系ステンレス鋼などが挙げられる。アルミニウムやマグネシウム、これらの合金で形成した場合、ケース４を軽量にできる。   The case 4 shown in this example is a metal case in which the bottom plate portion 40 and the side wall portion 41 are integrally formed. In general, since metal has a relatively high thermal conductivity, if it is a metal case, the entire case can be used as a heat dissipation path, and heat generated in the assembly 10 can be efficiently applied to an external installation target (for example, a cooling base). Heat can be radiated well, and the heat dissipation of the reactor 1 can be improved. Examples of the constituent material of the case 4 include aluminum and its alloys, magnesium and its alloys, copper and its alloys, silver and its alloys, iron and austenitic stainless steel. When formed of aluminum, magnesium, or an alloy thereof, the case 4 can be lightened.

・接合層
この例に示すリアクトル１は、図２，３に示すように、組合体１０の設置面に接合層７を備える。接合層７は、組合体１０のうちコイル２の下面と底板部４０との間に介在される。接合層７を備えることで、組合体１０を底板部４０に強固に固定でき、コイル２の動きの規制、放熱性の向上、設置対象への固定の安定化などを図ることができる。接合層７の構成材料は、絶縁性樹脂、特にセラミックスフィラーなどを含有して放熱性に優れるもの（例えば、熱伝導率が０．１Ｗ／ｍ・Ｋ以上、更に１Ｗ／ｍ・Ｋ以上、特に２Ｗ／ｍ・Ｋ以上）が好ましい。具体的な樹脂は、エポキシ樹脂、シリコーン樹脂、不飽和ポリエステルなどの熱硬化性樹脂や、ＰＰＳ樹脂、ＬＣＰなどの熱可塑性樹脂が挙げられる。接合層７は、例えばシート状のものを用いたり、塗布やスプレーしたりして形成するとよい。 -Junction layer The reactor 1 shown in this example is provided with the joining layer 7 in the installation surface of the assembly 10, as shown to FIG. The bonding layer 7 is interposed between the lower surface of the coil 2 and the bottom plate portion 40 in the combined body 10. By providing the bonding layer 7, the combined body 10 can be firmly fixed to the bottom plate portion 40, and the movement of the coil 2 can be restricted, the heat dissipation can be improved, and the fixing to the installation target can be stabilized. The constituent material of the bonding layer 7 includes an insulating resin, particularly a ceramic filler, and has excellent heat dissipation (for example, a thermal conductivity of 0.1 W / m · K or more, more preferably 1 W / m · K or more, particularly 2 W / m · K or more) is preferable. Specific examples of the resin include thermosetting resins such as epoxy resin, silicone resin, and unsaturated polyester, and thermoplastic resins such as PPS resin and LCP. The bonding layer 7 may be formed by using, for example, a sheet-like material, coating, or spraying.

・封止樹脂部
封止樹脂部６は、図１に示すように、ケース４内に充填され、ケース４内に収納された組合体１０を封止する部材である。封止樹脂部６は、組合体１０におけるコイル２の両巻線端部を除く上面が埋設されるまで充填されている（図２を参照）。リアクトル１は、封止樹脂部６で組合体１０を封止することによって、組合体１０をケース４に固定し、組合体１０の電気的・機械的保護、外部環境からの保護、コイル２に通電したときに発生する磁性コア３の振動、及びこの振動に起因する騒音の低減などを図ることができる。 -Sealing resin part The sealing resin part 6 is a member which seals the assembly 10 with which the case 4 was filled and accommodated in the case 4, as shown in FIG. The sealing resin portion 6 is filled until the upper surface excluding both winding ends of the coil 2 in the combined body 10 is buried (see FIG. 2). The reactor 1 seals the combined body 10 with the sealing resin portion 6 to fix the combined body 10 to the case 4, and protects the combined body 10 from electrical and mechanical protection, protection from the external environment, and the coil 2. It is possible to reduce the vibration of the magnetic core 3 generated when energized and the noise caused by the vibration.

本実施形態では、組合体１０の構成部材である介在部材５の固定部５３ｆによって組合体１０をケース４に固定しているため、封止樹脂部６で組合体１０の上面を覆わなくとも、組合体１０とケース４とは強固に固定される。この場合、封止樹脂部６の構成樹脂量を削減することができる。   In the present embodiment, since the combination 10 is fixed to the case 4 by the fixing portion 53f of the interposition member 5 that is a constituent member of the combination 10, even if the upper surface of the combination 10 is not covered with the sealing resin portion 6, The combined body 10 and the case 4 are firmly fixed. In this case, the constituent resin amount of the sealing resin portion 6 can be reduced.

また、本実施形態では、コイル２とケース４の底板部４０の内底面４０ｍとを接触した状態で強固に固定しているため、コイル２と外コア片３２ｍの外コア基部３２１の下面とケース４の底板部４０の内底面４０ｍとの間には封止樹脂部６の構成樹脂は介在していない（図２を参照）。   In this embodiment, since the coil 2 and the inner bottom surface 40m of the bottom plate portion 40 of the case 4 are firmly fixed in contact with each other, the lower surface of the outer core base 321 of the coil 2 and the outer core piece 32m and the case The constituent resin of the sealing resin part 6 is not interposed between the inner bottom face 40m of the bottom plate part 4 (see FIG. 2).

封止樹脂部６の構成材料には、例えば、エポキシ樹脂、ウレタン樹脂、シリコーン樹脂、不飽和ポリエステル樹脂、ＰＰＳ樹脂などが利用できる。特に、エポキシ樹脂やウレタン樹脂は、軟質であり、安価であるため好ましい。放熱性を高める観点から、封止樹脂部６には、アルミナやシリカなどの熱伝導率の高いセラミックスのフィラーを混合してもよい。   For example, an epoxy resin, a urethane resin, a silicone resin, an unsaturated polyester resin, or a PPS resin can be used as a constituent material of the sealing resin portion 6. In particular, an epoxy resin and a urethane resin are preferable because they are soft and inexpensive. From the viewpoint of improving heat dissipation, the sealing resin portion 6 may be mixed with a ceramic filler having high thermal conductivity such as alumina or silica.

〔リアクトルの製造方法〕
上記構成を備えるリアクトル１は、例えば、組合体１０の作製⇒組合体１０をケース４に収納・固定⇒封止樹脂部６の未固化の構成樹脂を充填・固化、という手順によって製造することができる。 [Reactor manufacturing method]
The reactor 1 having the above-described configuration can be manufactured by, for example, a procedure of manufacturing the assembled body ⇒ housing and fixing the combined body 10 in the case 4 ⇒ filling and solidifying the unsolidified constituent resin of the sealing resin portion 6. it can.

・組合体の作製
まず、一方の分割介在部材５Ａに、内コア片３１ｍ，…及びギャップ材３１ｇ，…と、一方の外コア片３２ｍと、を取り付ける。このとき、分割介在部材５Ａの端面介在部５２の挿通孔５２ｈ，５２ｈに一方の外コア片３２ｍの一対の突出部３２２，３２２を挿通し、分割介在部材５Ａの内側介在部５１に内コア片３１ｍ，…及びギャップ材３１ｇ，…の積層物を収納する。そうすると、分割介在部材５Ａによって、一方の外コア片３２ｍと内コア片３１ｍ，…及びギャップ材３１ｇ，…とが位置決めされた状態となる。次に、巻回部２ａ，２ｂを分割介在部材５Ａの内側介在部５１の外周に装着する。その後に、分割介在部材５Ａ，５Ｂを係合部５１ｅ，５２ｅで係合し、他方の分割介在部材５Ｂの端面介在部５２の挿通孔５２ｈ，５２ｈに他方の外コア片３２ｍの一対の突出部３２２，３２２を挿通する。この組合体１０は、介在部材５によって、コイル２と磁性コア３（内コア片３１ｍ，…とギャップ材３１ｇ，…と外コア片３２ｍ，３２ｍ）とが位置決めされた状態の一体物として取り扱える。 -Production of an assembly First, the inner core piece 31m, ... and the gap material 31g, ..., and one outer core piece 32m are attached to one divided interposing member 5A. At this time, the pair of projecting portions 322 and 322 of one outer core piece 32m are inserted into the insertion holes 52h and 52h of the end face interposed portion 52 of the divided interposing member 5A, and the inner core piece is inserted into the inner interposed portion 51 of the divided interposing member 5A. A stack of 31 m,... And a gap material 31 g,. Then, one outer core piece 32m, the inner core piece 31m,... And the gap material 31g,. Next, the winding portions 2a and 2b are attached to the outer periphery of the inner interposed portion 51 of the divided interposed member 5A. Thereafter, the split interposition members 5A and 5B are engaged by the engaging portions 51e and 52e, and the pair of protrusions of the other outer core piece 32m are inserted into the insertion holes 52h and 52h of the end face interposition portion 52 of the other split interposition member 5B. 322 and 322 are inserted. The combined body 10 can be handled as an integral body in which the coil 2 and the magnetic core 3 (the inner core pieces 31m, ..., the gap members 31g, ... and the outer core pieces 32m, 32m) are positioned by the interposition member 5.

・組合体をケースに収納・固定
組合体１０をケース４内に収納する（図３を参照）。ここでは、組合体１０の下面に接合層７を配置した後、組合体１０をケース４内に収納する。このとき、組合体１０の介在部材５の固定部５３ｆが、ケース４の取付部４５に配置される。固定部５３ｆの貫通孔５３ｆと、取付部４５の取付穴４５ｈとを位置合わせして、取付穴４５ｈと貫通孔５３ｈに締結部材９を貫通して締結することで、固定部５３ｆはケース４の底板部４０側に締め付けられて、組合体１０はケース４に固定される。 ・ Storing and fixing the combined body in the case The combined body 10 is stored in the case 4 (see FIG. 3). Here, after the bonding layer 7 is disposed on the lower surface of the combined body 10, the combined body 10 is housed in the case 4. At this time, the fixing portion 53 f of the interposition member 5 of the assembly 10 is disposed on the attachment portion 45 of the case 4. The through hole 53f of the fixing portion 53f and the attachment hole 45h of the attachment portion 45 are aligned, and the fastening member 9 is passed through and fastened to the attachment hole 45h and the through hole 53h. The combination 10 is fixed to the case 4 by being fastened to the bottom plate 40 side.

この固定部５４ｆのケース４への固定に伴って、押付部５１ｐはコイル２をケース４の底板部４０の内底面に押し付ける。固定部５４ｆと押付部５１ｐとは一体に成形されているため、固定部５４ｆがケース４の底板部４０側に締め付けられると、押付部５１ｐが固定部５４ｆに連動してケース４の底板部４０側に動くからである。この押付部５１ｐの押し付けによって、コイル２とケース４の底板部４０の内底面４０ｍとが接触した状態となる（図２を参照）。   As the fixing portion 54 f is fixed to the case 4, the pressing portion 51 p presses the coil 2 against the inner bottom surface of the bottom plate portion 40 of the case 4. Since the fixing portion 54f and the pressing portion 51p are integrally formed, when the fixing portion 54f is tightened to the bottom plate portion 40 side of the case 4, the pressing portion 51p is interlocked with the fixing portion 54f and the bottom plate portion 40 of the case 4 is connected. Because it moves to the side. The pressing of the pressing portion 51p brings the coil 2 into contact with the inner bottom surface 40m of the bottom plate portion 40 of the case 4 (see FIG. 2).

組合体１０が収納されたケース４内に、封止樹脂部６の未固化の構成樹脂を充填する。ケース４内に充填された上記未固化の構成樹脂は、コイル２の外周や磁性コア３の外周を覆うと共に、コイル２と磁性コア３との隙間に行き渡る。そして、上記構成樹脂を固化する。   The case 4 in which the combined body 10 is stored is filled with an unsolidified constituent resin of the sealing resin portion 6. The unsolidified constituent resin filled in the case 4 covers the outer periphery of the coil 2 and the outer periphery of the magnetic core 3, and reaches the gap between the coil 2 and the magnetic core 3. Then, the constituent resin is solidified.

〔主要な効果〕
以上説明したリアクトル１は、介在部材５が固定部５３ｆを備えることで、組合体１０の構成部材で組合体１０をケース４に固定することができるため、ケース４に対して組合体１０を配置し易く、リアクトル１の組立作業性に優れる。また、ケース４への組合体１０の固定は、組合体１０の構成部材を利用して行っているため、従来のステーのような別部材を準備する必要がなく、部品点数を削減できる。 [Main effects]
In the reactor 1 described above, since the interposing member 5 includes the fixing portion 53f, the union body 10 can be fixed to the case 4 with the constituent members of the union body 10, and thus the union body 10 is disposed with respect to the case 4. It is easy to do and is excellent in the assembly workability of the reactor 1. Moreover, since the assembly 10 is fixed to the case 4 using the constituent members of the assembly 10, it is not necessary to prepare another member such as a conventional stay, and the number of parts can be reduced.

さらに、リアクトル１は、介在部材５が押付部５１ｐを備えることで、固定部５３ｆのケース４への固定に伴って押付部５１ｐがコイル２をケース４の底板部４０の内底面４０ｍ側に押し付ける作用が働くため、コイル２とケース４の底板部４０の内底面４０ｍとを接触した状態で容易に固定できる。コイル２とケース４の内底面４０ｍとが接触することで、このリアクトル１は放熱性に優れる。   Further, in the reactor 1, the interposed member 5 includes the pressing portion 51 p, so that the pressing portion 51 p presses the coil 2 against the inner bottom surface 40 m side of the bottom plate portion 40 of the case 4 as the fixing portion 53 f is fixed to the case 4. Since the action works, the coil 2 and the inner bottom surface 40m of the bottom plate portion 40 of the case 4 can be easily fixed in a contact state. The reactor 1 is excellent in heat dissipation because the coil 2 and the inner bottom surface 40m of the case 4 are in contact with each other.

上記リアクトル１では、介在部材５の固定部５３ｆがケース４の角部に向かって配置される例を説明したが、例えば、固定部は、外コア片３２ｍの外コア基部３２１の厚さ方向に延出して配置されてもよい。また、固定部に形成される貫通孔の個数も適宜選択できる。   In the reactor 1, the example in which the fixing portion 53f of the interposition member 5 is arranged toward the corner portion of the case 4 has been described. For example, the fixing portion is in the thickness direction of the outer core base portion 321 of the outer core piece 32m. You may extend and arrange | position. In addition, the number of through holes formed in the fixed portion can be selected as appropriate.

本発明のリアクトルは、ハイブリッド自動車、プラグインハイブリッド自動車、電気自動車、燃料電池自動車などの車両に搭載される車載用コンバータ（代表的にはＤＣ−ＤＣコンバータ）や、空調機のコンバータなどの種々のコンバータ、並びに電力変換装置の構成部品に好適に利用することができる。   The reactor of the present invention includes various on-vehicle converters (typically DC-DC converters) mounted on vehicles such as hybrid vehicles, plug-in hybrid vehicles, electric vehicles, and fuel cell vehicles, and converters for air conditioners. It can utilize suitably for the component of a converter and a power converter device.

１ リアクトル １０ 組合体
２ コイル
２ａ，２ｂ 巻回部 ２ｒ 連結部 ２ｗ 巻線
３ 磁性コア
３１ｍ 内コア片 ３１ｇ ギャップ材
３２ｍ 外コア片 ３２１ 外コア基部 ３２２ 突出部
４ ケース
４０ 底板部 ４０ｍ 内底面 ４１ 側壁部
４５ 取付部 ４５ｈ 取付穴
５ 介在部材 ５Ａ，５Ｂ 分割介在部材
５１ 内側介在部
５１ｆ 介在片 ５１ｐ 押付部 ５１ｅ 係合部
５２ 端面介在部
５２ｈ 挿通孔 ５２ｅ 係合部
５２ｄ 仕切り部 ５２ｓ センサ保持部
５３ 延出部 ５３ｆ 固定部 ５３ｈ 貫通孔
５４ 補強部
６ 封止樹脂部
７ 接合層
９ 締結部材（ボルト） DESCRIPTION OF SYMBOLS 1 Reactor 10 Combination 2 Coil 2a, 2b Winding part 2r Connection part 2w Winding 3 Magnetic core 31m Inner core piece 31g Gap material 32m Outer core piece 321 Outer core base part 322 Protrusion part 4 Case 40 Bottom plate part 40m Inner bottom face 41 Side wall Part 45 attachment part 45h attachment hole 5 interposition member 5A, 5B split interposition member 51 inner interposition part 51f interposition piece 51p pressing part 51e engagement part 52 end face interposition part 52h insertion hole 52e engagement part 52d partition part 52s sensor holding part 53 extension Protruding part 53f Fixing part 53h Through hole 54 Reinforcing part 6 Sealing resin part 7 Joining layer 9 Fastening member (bolt)

Claims (3)

巻回部を有するコイルと、
前記巻回部内に全体が配置される内コア片と、前記巻回部外に配置される部分を有する外コア片とを有する磁性コアと、
前記巻回部と前記磁性コアとの間に介在される部分を有する介在部材と、
前記コイルと前記磁性コアと前記介在部材との組合体を収納する有底四角筒状のケースと、を備えるリアクトルであって、
前記介在部材は、
前記巻回部内に配置される内側介在部と、
前記巻回部と前記外コア片との間に介在される端面介在部と、
前記巻回部の軸方向外方に延出して前記外コア片の上面に配置される延出部と、を備え、
前記延出部は、締結部材の貫通孔を有し、前記締結部材によって前記ケースの内底面側に締め付けられると共に、前記組合体を前記ケースに固定する固定部を備え、
前記内側介在部は、前記固定部と一体に成形され、前記巻回部の内周面における前記ケースの内底面側の領域と前記磁性コアとの間に介在される部材であり、前記固定部の前記ケースへの固定に伴い、前記コイルを前記ケースの内底面に押し付ける押付部を備え、
前記固定部は、前記ケースの各角部に向かって延び、前記貫通孔側を自由端、その反対側を前記押付部側との連結端とする片持ち支持構造の板状片であり、
前記介在部材は、前記固定部における前記ケースの内底面側の面と前記端面介在部における前記外コア片側の面とを繋ぎ、前記外コア片の側面沿いに設けられる補強部を備えるリアクトル。 A coil having a winding part;
A magnetic core having an inner core piece entirely disposed in the winding portion and an outer core piece having a portion arranged outside the winding portion;
An interposition member having a portion interposed between the winding part and the magnetic core;
A bottomed square cylindrical case that houses a combination of the coil, the magnetic core, and the interposition member, and a reactor,
The interposition member is
An inner interposition part arranged in the winding part;
An end surface interposed portion interposed between the wound portion and the outer core piece;
An extending portion extending outward in the axial direction of the winding portion and disposed on the upper surface of the outer core piece,
The extension portion has a through hole of a fastening member, and is fastened to the inner bottom surface side of the case by the fastening member, and includes a fixing portion that fixes the combination to the case .
The inner interposed portion is a member that is formed integrally with the fixed portion, and is interposed between a region on the inner bottom surface side of the case on the inner peripheral surface of the winding portion and the magnetic core, and the fixed portion Along with fixing to the case, a pressing portion that presses the coil against the inner bottom surface of the case ,
The fixing portion is a plate-like piece of a cantilever support structure that extends toward each corner of the case, and has the through hole side as a free end and the opposite side as a connection end with the pressing portion side,
The intervening member connects a surface on the inner bottom surface side of the case in the fixed portion and a surface on the outer core piece side in the end surface intervening portion, and includes a reinforcing portion provided along a side surface of the outer core piece . 前記介在部材は、前記巻回部の軸方向に二分割される一対の分割介在部材を組み合わせて構成されており、
前記一対の分割介在部材の一方は、前記押付部を含み、前記磁性コアのうち前記巻回部内に配置される内コア片及びギャップ材の全てを収納可能な筒状部を備える請求項１に記載のリアクトル。 The interposition member is configured by combining a pair of split interposition members that are divided in two in the axial direction of the winding portion,
One of the pair of split interposed member comprises said pressing portion, to claim 1, further comprising a tubular portion capable of housing all of the inner core pieces and the gap members disposed within the winding portion of the magnetic core The described reactor. 前記一対の分割介在部材は、互いに係合する係合部を備える請求項２に記載のリアクトル。 The reactor according to claim 2 , wherein the pair of split interposition members include engaging portions that engage with each other.

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