JP6368479B2 - Reactor - Google Patents
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- JP6368479B2 JP6368479B2 JP2013234283A JP2013234283A JP6368479B2 JP 6368479 B2 JP6368479 B2 JP 6368479B2 JP 2013234283 A JP2013234283 A JP 2013234283A JP 2013234283 A JP2013234283 A JP 2013234283A JP 6368479 B2 JP6368479 B2 JP 6368479B2
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Description
本発明は、コアの樹脂モールド部分に改良を施したリアクトルに関する。 The present invention relates to a reactor in which a resin mold portion of a core is improved.
車載用の昇圧回路に用いられるリアクトルとして、特許文献1〜3に示すように、コアの周囲に配置した樹脂製のボビンにコイルを巻回した後、これらを金属製のケースに収納し、ケース内に封止樹脂を流し込んで固めたものが多く用いられる。 As shown in Patent Documents 1 to 3, as a reactor used in an in-vehicle booster circuit, a coil is wound around a resin bobbin arranged around a core, and then these are housed in a metal case. Often used is one in which a sealing resin is poured and hardened.
たとえば、図10に示す従来技術は、特許文献1に記載の分割コアとその周囲の樹脂成型品(以下、成形品と呼ぶ)を示すものである。図10において、100は環状コアの左右の脚部、101は環状コアのヨーク部、102はその内部にヨーク部101をモールド成型した成型品である。成型品102には、筒状のボビン102aが一体に設けられ、このボビン102a内にIコア100が挿入され、ボビン102aの外周にコイル103が装着される。 For example, the prior art shown in FIG. 10 shows a split core described in Patent Document 1 and a resin molded product around it (hereinafter referred to as a molded product). In FIG. 10, 100 is a left and right leg part of the annular core, 101 is a yoke part of the annular core, and 102 is a molded product in which the yoke part 101 is molded. The molded product 102 is integrally provided with a cylindrical bobbin 102a, the I core 100 is inserted into the bobbin 102a, and the coil 103 is mounted on the outer periphery of the bobbin 102a.
この種のリアクトルは、アルミニウムなどの放熱性に優れた金属製のケース104内に収納された状態で、車輌その他の機器に固定される。その場合、リアクトルとケース104との間には封止樹脂が充填され、ケース104内におけるリアクトルの固定を確実にすると共に絶縁を確保している。 This type of reactor is fixed to a vehicle or other equipment in a state of being housed in a metal case 104 having excellent heat dissipation such as aluminum. In that case, sealing resin is filled between the reactor and the case 104 to ensure the fixation of the reactor in the case 104 and to ensure insulation.
ところで、この種のリアクトルにおいては、
(1)製品の小型化
(2)製造工程の簡略化
(3)放熱性の向上
と言う解決すべき課題が存在する。
By the way, in this kind of reactor,
(1) Miniaturization of product (2) Simplification of manufacturing process (3) There is a problem to be solved that is improvement of heat dissipation.
たとえば、図10に示す従来技術では、成型品102とケース104とをできる限り接近して設けることでケース104の小型化を図ることが望ましい。しかし、成型品102とケース104との隙間には封止樹脂が充填されることから、一定寸法以下に両者を接近させることはできない。そのため、小型化を可能とした成型品102の構成が望まれていた。 For example, in the prior art shown in FIG. 10, it is desirable to reduce the size of the case 104 by providing the molded product 102 and the case 104 as close as possible. However, since the sealing resin is filled in the gap between the molded product 102 and the case 104, the two cannot be brought close to a certain dimension or less. Therefore, a configuration of the molded product 102 that can be reduced in size has been desired.
また、従来技術では、成型品102の成型作業時に、金型内にセットしたヨーク部101が成型品102の材料である溶融樹脂の注入圧力で位置ズレを生じないように、金型の一部に突起を設けてヨーク部101を外側から押さえておく必要がある。そのため、完成された成型品102には、ヨーク部101を押さえていた突起の形状に合わせて、ヨーク部101の外面が露出した開口部102bが形成される。 Further, according to the conventional technique, a part of the mold is prevented so that the yoke portion 101 set in the mold does not shift due to the injection pressure of the molten resin that is the material of the molded article 102 when the molded article 102 is molded. It is necessary to provide a protrusion on the yoke portion 101 to hold the yoke portion 101 from the outside. Therefore, in the completed molded product 102, an opening 102b in which the outer surface of the yoke part 101 is exposed is formed in accordance with the shape of the protrusion that holds the yoke part 101.
従来技術では、金型の突起がヨーク部101の外面中央部のみに当接していたため、樹脂の硬化後は突起の全周囲は硬化した成型品102の縁によって取り囲まれてしまい、完成された成型品102を金型から取り出すためには、突起の分だけ金型を移動させる必要があった。すなわち、この種の成型品を製造する場合は、ヨーク部101のモールドに加えて、ボビン102aその他の部材を一体に成型することが一般的であるため、アンダーカットが生じないように成型品の形状に配慮したり、分割式の金型を用いて抜き方向(離型方向)を工夫する必要がある。そのため、開口部102bのような離型時に金型の移動が必要となる構成は、成型品102の製造工程を複雑化させる欠点があった。 In the prior art, since the projection of the mold is in contact with only the central portion of the outer surface of the yoke portion 101, the entire periphery of the projection is surrounded by the edge of the cured molded product 102 after the resin is cured, and the completed molding is completed. In order to take out the product 102 from the mold, it was necessary to move the mold by the amount of the protrusion. That is, when manufacturing this type of molded product, it is common to integrally mold the bobbin 102a and other members in addition to the mold of the yoke portion 101. It is necessary to consider the shape and to devise the direction of release (release direction) using a split mold. For this reason, the configuration that requires the movement of the mold at the time of mold release such as the opening 102b has a drawback in that the manufacturing process of the molded product 102 is complicated.
更に、この種のリアクトルでは、成型品102の外面に設けられた開口部102bの部分で、ヨーク部101とケース104内部に充填した封止樹脂とが接触することになる。しかし、従来技術では、この開口部102bがもっぱら金型内におけるヨーク部101の位置決めの目的で設けられていたため、ヨーク部101と封止樹脂間の熱伝導特性までは考慮されておらず、ヨーク部101から効果的に外部に放熱できる構成ではなかった。 Further, in this type of reactor, the yoke portion 101 and the sealing resin filled in the case 104 come into contact with each other at the opening 102 b provided on the outer surface of the molded product 102. However, in the prior art, since the opening 102b is provided exclusively for the purpose of positioning the yoke 101 in the mold, the heat conduction characteristics between the yoke 101 and the sealing resin are not taken into consideration. It was not the structure which can thermally radiate outside effectively from the part 101.
本発明は、前記のような従来技術の問題点を解決するために提案されたものである。本発明の目的は、成型品に形成する金型当接用の開口部の構成を改良することにより、製品の小型化、製造工程の簡略化及び放熱性の向上を可能としたリアクトルを提供することにある。 The present invention has been proposed to solve the above-described problems of the prior art. An object of the present invention is to provide a reactor capable of reducing the size of a product, simplifying a manufacturing process, and improving heat dissipation by improving the configuration of a mold contact opening formed in a molded product. There is.
本発明のリアクトルは、次のような構成を有することを特徴とする。
(1)ヨーク部と脚部とから成る環状コアと、この環状コアの脚部の外周に巻かれたコイルを備える。
(2)前記ヨーク部の周囲には、少なくとも前記ヨーク部を埋設してなる樹脂成形品が設けられている。
(3)前記樹脂成形品には、前記ヨーク部の外側面を覆う被覆部が一体に形成されている。
(4)前記ヨーク部の外側面が、前記コイルの軸方向と直交する平坦な垂直面と、その両側に形成された面取り部を備えている。
(5)前記被覆部には、金型内に前記ヨーク部を配置する際の位置決め用の突起がコアに接触する開口部が前記平坦な垂直面の下部に形成され、この開口部は前記ヨーク部の表面が露出していると共に、この開口部は前記環状コアの軸方向に対してアンダーカットにならない形状である。
(6)前記面取り部の表面が前記樹脂成型品によって被覆されている。
(7)前記樹脂成型品の端部が前記平坦な垂直面よりもケース内面側に突出していない。
The reactor of this invention has the following structures, It is characterized by the above-mentioned.
(1) An annular core composed of a yoke part and a leg part and a coil wound around the outer periphery of the leg part of the annular core are provided.
(2) Around the yoke portion, formed by embedding at least the yoke part resin molded product is provided.
(3) The resin molded article, the coating portion that covers the outer surface of the yoke portion is integrally formed.
(4) The outer surface of the yoke portion includes a flat vertical surface perpendicular to the axial direction of the coil and chamfered portions formed on both sides thereof.
(5) the the covering portion, the opening projection for positioning in placing the yoke portion in the mold is in contact with the core is formed in the lower portion of the flat vertical surface, the opening said yoke together with the surface of the part is exposed, the opening has a shape as not to undercut the axial direction of the annular core.
(6) The surface of the chamfered portion is covered with the resin molded product.
(7) The end of the resin molded product does not protrude toward the inner surface of the case from the flat vertical surface.
本発明において、前記環状コア、前記樹脂成型品及び前記コイルから成るリアクトル本体がケース内に収納され、前記ケースの内面が、前記被覆部に形成された前記開口部の上部から、前記開口部の下部に露出している前記ヨーク部の下辺に向かって傾斜し、ケース内面と前記被覆部表面及びケース内面と前記ヨーク部下辺との間に、所定の隙間が形成されていることが好ましい。
In the present invention, the annular core, the resin molded article and a reactor main body made of the coil is housed in the case, the inner surface of the case, from the top of the opening formed in the cover portion, of the opening inclined toward the lower side of the yoke portion which is exposed at the bottom, between the inner surface of the case and the cover part surface and the case inner surface of said yoke subordinate side, it is preferable that predetermined gap is formed.
本発明において、前記リアクトル本体とケースの隙間に封止樹脂が充填されていることが好ましい。前記樹脂成型品が前記ヨーク部の底部の全体あるいは一部を覆うもので、前記ヨーク部の底部を覆う前記樹脂成型品とケース内面との隙間に前記封止樹脂が充填されていても良い。
In the present invention, it is preferable that a sealing resin is filled in a gap between the reactor main body and the case. The intended resin molding covers the whole or part of the bottom portion of the yoke portion, the sealing resin in a gap between the resin molding and the inner surface of the case to cover the bottom of the yoke portion may be filled.
本発明において、前記封止樹脂が熱伝導性に優れたもので、前記ヨーク部が前記環状コアの軸方向から加圧成形された圧粉磁心から構成され、前記コイルの軸方向に対する熱伝導率が前記環状コアの軸方向に対する熱伝導率よりも優れ、前記ヨーク部の外側面に形成された前記開口部が前記ヨーク部の底部に形成された前記開口部よりも広い面積で前記封止樹脂と接触していても良い。
In the present invention, the intended sealing resin is excellent in thermal conductivity, the yoke portion is constituted from the pressure molded dust core in the axial direction of the annular core, the thermal conductivity with respect to the axial direction of the coil the sealing resin but better than the thermal conductivity with respect to the axial direction of the annular core, a wider area than the opening in which the opening formed on the outer surface formed in the bottom of the yoke portion of the yoke portion May be in contact with.
本発明によれば、次のような効果が得られる。
(1)ヨーク部を樹脂モールド成型したモールドコアにおいて、ケース側壁と向かい合うヨーク部の外側面について、該外側面の下部の樹脂を削除したことで、リアクトルの長手方向のケース寸法を小さくすることを可能とした。
(2)外側面の樹脂モールドの下部を削除することで、ヨーク部外側面を金型で押圧したままコアを上方向に抜いても引っかかることはなくなり、生産性が向上した。
(3)外側面下部の樹脂がなくなったことで、この部分に樹脂よりも熱伝導率の高い封止樹脂が入り込むことで放熱効率も向上する。特に、ヨーク部を上下方向から加圧した圧粉磁心によって成型した場合には、下方向よりも横方向の熱伝導性が高いため、放熱性も向上する。
According to the present invention, the following effects can be obtained.
(1) In the mold core in which the yoke part is resin-molded, the case dimension in the longitudinal direction of the reactor is reduced by removing the resin at the lower part of the outer side of the yoke part facing the side wall of the case. It was possible.
(2) By removing the lower part of the resin mold on the outer surface, the core is not caught even if the core is pulled upward while pressing the outer surface of the yoke part with a mold, and the productivity is improved.
(3) Since the resin at the lower portion of the outer side surface is eliminated, the heat radiation efficiency is improved by the sealing resin having a higher thermal conductivity than the resin entering this portion. In particular, when the yoke portion is molded with a dust core pressed from above and below, the heat conductivity in the lateral direction is higher than in the downward direction, so that heat dissipation is improved.
1.第1実施形態
以下、本発明の第1実施形態を図1から図9に従って具体的に説明する。
1. First Embodiment Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS.
(1)構成
本実施形態のリアクトルは、四隅が直線状に面取りされた環状コアを有するもので、この環状コアは、図2の分解斜視図に示すように、ヨーク部を構成する2つのU字型コア1a,1bと、脚部を構成する左右各2個のI字型コア1c,1dを、スペーサ1eを介して接続したものである。
(1) Configuration The reactor of the present embodiment has an annular core whose four corners are linearly chamfered, and the annular core includes two Us constituting the yoke portion as shown in the exploded perspective view of FIG. The letter-shaped cores 1a and 1b are connected to the two left and right I-shaped cores 1c and 1d constituting the legs through spacers 1e.
環状コアを構成する2つのU字型コア1a,1bと左右各2個のI字型コア1c,1dのうち、少なくとも2つのU字型コア1a,1bは、環状コアの軸方向(環状コアの内側の開口部に対して垂直に貫通する方向)から加圧成形された圧粉磁心から構成されている。圧粉磁心においては、加圧方向により磁心を構成する軟磁性粉末の変形度が異なり、それに伴い、熱伝導率も異なってくる。本実施形態では、U字型コア1a,1bを環状コアの軸方向から加圧して成型するため、コイルの軸方向に対する熱伝導率が環状コアの軸方向に対する熱伝導率よりも優れている。 Of the two U-shaped cores 1a, 1b and the two left and right I-shaped cores 1c, 1d constituting the annular core, at least two U-shaped cores 1a, 1b are in the axial direction of the annular core (annular core In a direction penetrating perpendicularly to the inner opening portion). In the powder magnetic core, the degree of deformation of the soft magnetic powder constituting the magnetic core varies depending on the pressing direction, and the thermal conductivity varies accordingly. In this embodiment, since the U-shaped cores 1a and 1b are pressed and molded from the axial direction of the annular core, the thermal conductivity in the axial direction of the coil is superior to the thermal conductivity in the axial direction of the annular core.
環状コアは、その外周に設けられた第1と第2の成形品2,3によって被覆されている。第1の成型品2は、筒状をした左右のボビン22a,22bと、これらを繋ぐように設けられたコア被覆部21を有し、それらの内部に第1のU字型コア1aがモールド成型法によって埋設されている。第2の成型品3は、左右のボビン32a,32bとコア被覆部31を備え、その内部に第2のU字型コア1bがモールド成型法によって埋設されている。 The annular core is covered with first and second molded articles 2 and 3 provided on the outer periphery thereof. The first molded product 2 has cylindrical left and right bobbins 22a and 22b, and a core covering portion 21 provided so as to connect them, and the first U-shaped core 1a is molded inside them. It is buried by the molding method. The second molded product 3 includes left and right bobbins 32a and 32b and a core covering portion 31, and a second U-shaped core 1b is embedded therein by a molding method.
第2の成形品3の左右のボビン32a,32bは、第1の成形品2のボビン22a,22bよりは短く、互いに突き合わされたこれらボビンの内部にI字型コア1c,1dが挿入されている。ボビン22a,22bの外周には、左右のコイル51a,51bが巻回されている。これら左右のコイル51a,51bは1本の導体によって構成され、コイルの両端は第2の成型品3側で上方向に引き出されている。 The left and right bobbins 32a, 32b of the second molded product 3 are shorter than the bobbins 22a, 22b of the first molded product 2, and the I-shaped cores 1c, 1d are inserted into the bobbins that are abutted with each other. Yes. The left and right coils 51a and 51b are wound around the outer circumferences of the bobbins 22a and 22b. These left and right coils 51a and 51b are constituted by one conductor, and both ends of the coil are drawn upward on the second molded product 3 side.
被覆部21,31の外側面、すなわち、U字型コア1a,1bにおけるケース4の内面と対向する外側面には、モールド成型時にU字型コア1a,1bを金型内に保持する際に、金型に設けられた突起が接触する開口部21a,31aが設けられており、この開口部21a,31aに成形品内部のU字型コア1a,1bの表面が露出している。 When the U-shaped cores 1a and 1b are held in the mold during molding, the outer surfaces of the covering portions 21 and 31, that is, the outer surfaces facing the inner surface of the case 4 in the U-shaped cores 1a and 1b are used. Openings 21a and 31a with which protrusions provided on the mold come into contact are provided, and the surfaces of the U-shaped cores 1a and 1b inside the molded product are exposed at the openings 21a and 31a.
すなわち、図3及び図4に示すように、本実施形態では、U字型コア1a,1bの外側面が、コイルの軸方向と直交する平坦な垂直面11a,11b(U字の底の部分)と、その両側に形成された面取り部12a,12b(U字のコーナー部分)を備えており、開口部21a,31aが平坦な垂直面11a,11bの下部全域に形成されている。そのため、開口部21a,31aの左右は、面取り部12a,12bの表面を覆う被覆部21,31の縁に面しており、開口部21a,31aの下部にはU字型コア1a,1bの下辺が露出している。 That is, as shown in FIGS. 3 and 4, in this embodiment, the outer surfaces of the U-shaped cores 1 a and 1 b are flat vertical surfaces 11 a and 11 b (parts at the bottom of the U shape) orthogonal to the axial direction of the coil. And chamfered portions 12a and 12b (U-shaped corner portions) formed on both sides thereof, and openings 21a and 31a are formed in the entire lower part of the flat vertical surfaces 11a and 11b. Therefore, the left and right sides of the openings 21a and 31a face the edges of the covering parts 21 and 31 that cover the surfaces of the chamfered parts 12a and 12b, and the U-shaped cores 1a and 1b are formed below the openings 21a and 31a. The bottom side is exposed.
この場合、図7(a)(b)に示すように、面取り部12a,12bの表面を覆う被覆部21,31の縁は、開口部21a,31aに露出するU字型コア1a,1bの垂直面の表面から突出することがないように形成されている。すなわち、本実施形態では、図7(c)に示すように、面取り部12a,12bの表面を覆う被覆部21,31の縁がU字型コア1a,1bの垂直面11a,11bの表面から突出することはない。 In this case, as shown in FIGS. 7A and 7B, the edges of the covering portions 21 and 31 covering the surfaces of the chamfered portions 12a and 12b are formed on the U-shaped cores 1a and 1b exposed in the openings 21a and 31a. It is formed so as not to protrude from the surface of the vertical surface. That is, in this embodiment, as shown in FIG.7 (c), the edge of the coating | coated parts 21 and 31 which covers the surface of the chamfering parts 12a and 12b is from the surface of the vertical surfaces 11a and 11b of the U-shaped cores 1a and 1b. It does not protrude.
図6に示すように、被覆部21,31の底部には、成型時にU字型コア1a,1bを金型上にセットした結果、樹脂が存在せずに、U字型コア1a,1bの底部が露出した開口部21b,31bと、U字型コア1a,1bの左右の面取り部12a,12bの底部を接続する樹脂製の連結部21c,31cが形成されている。ここで、U字型コア1a,1bの外側面に形成された開口部21a,31aが、ヨーク部の底部に形成された開口部21b,31bよりも広い面積で封止樹脂と接触している。 As shown in FIG. 6, as a result of setting the U-shaped cores 1a and 1b on the molds at the bottom of the covering portions 21 and 31, there is no resin and the U-shaped cores 1a and 1b Opening portions 21b and 31b with exposed bottom portions and resin-made connecting portions 21c and 31c that connect the bottom portions of the left and right chamfered portions 12a and 12b of the U-shaped cores 1a and 1b are formed. Here, the openings 21a and 31a formed on the outer surfaces of the U-shaped cores 1a and 1b are in contact with the sealing resin over a larger area than the openings 21b and 31b formed at the bottom of the yoke portion. .
第1と第2の成形品2,3における被覆部21,31の上部には、これらの成形品をケース4に固定するための金具52,53がモールド成形法により埋設されている。この固定金具52,53は、両端にねじ挿入穴52a,53aを備えた板状の部材で、その中央部分が成形品2,3内に埋設され、両端のねじ挿入穴52a,53a部分が成形品2,3の左右に突出している。 Metal fittings 52 and 53 for fixing these molded products to the case 4 are embedded in the upper portions of the covering portions 21 and 31 of the first and second molded products 2 and 3 by a molding method. The fixing brackets 52 and 53 are plate-like members having screw insertion holes 52a and 53a at both ends, the central portions thereof are embedded in the molded products 2 and 3, and the screw insertion holes 52a and 53a at both ends are molded. It protrudes to the left and right of the products 2 and 3.
前記のような構成を有する環状コア、成形品2,3及び左右のコイル51a,51bは、組み立てられた状態でケース4内に収納され、固定金具52,53をこのねじ挿入穴52a,53aに差し込んだねじ62,63を、ケース4のねじ穴に締結することで、成型品2,3とケース4は固定される。この場合、図8の断面図に示すように、樹脂成形品2,3及び左右のコイル51a,51bの外周とケース4の内面との間に所定の隙間が保たれるように固定する。その隙間に封止樹脂70を充填して固化することで、ケース4と組み立てられたリアクトル本体を一体化する。U字型コア1a,1bの露出を防ぐために、封止樹脂70は、その上面が開口部21a,31aの上縁より高い位置となるように充填されている。 The annular core, the molded products 2 and 3 and the left and right coils 51a and 51b having the above-described configuration are accommodated in the case 4 in an assembled state, and the fixing brackets 52 and 53 are inserted into the screw insertion holes 52a and 53a. By fastening the inserted screws 62 and 63 into the screw holes of the case 4, the molded products 2 and 3 and the case 4 are fixed. In this case, as shown in the cross-sectional view of FIG. 8, the resin molded products 2 and 3 and the left and right coils 51 a and 51 b are fixed so that a predetermined gap is maintained between the outer periphery of the case 4 and the inner surface of the case 4. By filling the gap with the sealing resin 70 and solidifying, the case 4 and the assembled reactor main body are integrated. In order to prevent the U-shaped cores 1a and 1b from being exposed, the sealing resin 70 is filled so that the upper surface thereof is positioned higher than the upper edges of the openings 21a and 31a.
ケース4の内面における成型品2,3の開口部21a,31aと対向する部分、すなわち、U字型コア1a,1bの垂直面11a,11bと対向する面は、図7の断面図に示すように、上部がケースの外側に広がったテーパー面になっている。そのため、開口部21a,31aの下縁に露出しているU字型コア1a,1bの下辺とケース4の内面との距離L1と、開口部21a,31aの上縁に面している被覆部21,31の縁とケース4の内面との距離L2がほぼ等しく、これらの隙間に充填される封止樹脂70の肉厚がケース4の上部と下部とでほぼ均一になっている。 The portions facing the openings 21a and 31a of the molded products 2 and 3 on the inner surface of the case 4, that is, the surfaces facing the vertical surfaces 11a and 11b of the U-shaped cores 1a and 1b are as shown in the sectional view of FIG. In addition, the upper part is a tapered surface spreading outside the case. Therefore, the distance L1 between the lower side of the U-shaped cores 1a, 1b exposed at the lower edges of the openings 21a, 31a and the inner surface of the case 4, and the covering part facing the upper edges of the openings 21a, 31a The distance L2 between the edges of 21 and 31 and the inner surface of the case 4 is substantially equal, and the thickness of the sealing resin 70 filled in these gaps is substantially uniform between the upper portion and the lower portion of the case 4.
封止樹脂70としては、熱伝導性無機フィラーなどを添加することにより優れた熱伝導性に優れたものであり、例えば、熱伝導率が1〜2W/(m・K)程度のものを使用する。これに対して、成型品2,3を構成する樹脂の熱伝導率は、一般的な合成樹脂の熱伝導率である0.2〜0.4W/(m・K)程度である。 The sealing resin 70 has excellent thermal conductivity by adding a thermally conductive inorganic filler or the like. For example, a resin having a thermal conductivity of about 1 to 2 W / (m · K) is used. To do. On the other hand, the thermal conductivity of the resin constituting the molded products 2 and 3 is about 0.2 to 0.4 W / (m · K), which is the thermal conductivity of a general synthetic resin.
(2)作用効果
(2−1)
本実施形態によれば、U字型コア1a,1bの外側面に形成された開口部21a,31aの下方に樹脂が存在せず、U字型コア1a,1bの下辺が露出している。そのため、図9に示すように、開口部21a,31aの部分に金型Bを配置してU字型コア1a,1bを押さえた状態でモールド成型しても、金型Bを矢印方向に移動させることなく、一体化されたU字型コア1a,1bと成型品2,3を上方に取り出すことができる。
(2) Effects (2-1)
According to the present embodiment, no resin exists below the openings 21a and 31a formed on the outer surfaces of the U-shaped cores 1a and 1b, and the lower sides of the U-shaped cores 1a and 1b are exposed. Therefore, as shown in FIG. 9, even if the mold B is placed in the openings 21a and 31a and the U-shaped cores 1a and 1b are pressed, the mold B is moved in the direction of the arrow. Without making it possible, the integrated U-shaped cores 1a and 1b and the molded products 2 and 3 can be taken out upward.
成型品2,3には、筒状のボビン22a,22b,32a,32bが設けられていることから、ボビン側の金型Aにはアンダーカットが生じることは避けられず、成型後に金型Aを図9の矢印方向に移動させないと、U字型コア1a,1bと成型品2,3を上方に取り出すことができない。従来技術では、開口部21a,31a側にもアンダーカットがあったため、U字型コア1a,1bの外側面側の金型Cも図9の矢印方向に移動させる必要があったが、本実施形態では、外側面側の金型Bは固定したまま金型Aの移動のみで製品を金型から取り出すことができるので、作業性が各段に向上する。 Since the molded products 2 and 3 are provided with cylindrical bobbins 22a, 22b, 32a and 32b, it is inevitable that undercutting occurs in the mold A on the bobbin side. 9 is not moved in the direction of the arrow in FIG. 9, the U-shaped cores 1a and 1b and the molded products 2 and 3 cannot be taken out upward. In the prior art, since there was an undercut on the side of the openings 21a and 31a, the mold C on the outer surface side of the U-shaped cores 1a and 1b had to be moved in the direction of the arrow in FIG. In the embodiment, since the product B can be taken out from the mold only by moving the mold A while the mold B on the outer surface side is fixed, the workability is improved to each stage.
(2−2)
本実施形態では、ケース4の内面は、図7の断面図に示すように、上部がケースの外側に広がったテーパー面となるように傾斜しているので、ケース4と成型品2,3との間に充填する封止樹脂70の肉厚をケース4の上部と下部とで均等にすることができると共に、ケース4の下部コーナー部の肉厚を大きくして、ケース4の強度を上げることができる。すなわち、ケース4は内部にリアクトル本体を挿入する際の作業性から上方の開口部が下部よりも広くなっていることが望ましい。同時に、ケース4の強度も、下部コーナー部を厚くすることで確保できる。
(2-2)
In the present embodiment, as shown in the cross-sectional view of FIG. 7, the inner surface of the case 4 is inclined so that the upper portion becomes a tapered surface that spreads outside the case. The thickness of the sealing resin 70 filled between the upper and lower portions of the case 4 can be made uniform between the upper and lower portions, and the thickness of the lower corner portion of the case 4 is increased to increase the strength of the case 4. Can do. That is, it is desirable that the upper opening of the case 4 is wider than the lower part because of workability when inserting the reactor main body into the case 4. At the same time, the strength of the case 4 can be ensured by making the lower corner thick.
このような内面が傾斜したケース4を使用した場合に、被覆部21,31の下部は開口部になっており樹脂が存在しないので、封止樹脂70の肉厚を規定量確保しながらも、ケース内面とリアクトル本体とを接近させて、ケース4の小型化を図ることができる。 When such a case 4 whose inner surface is inclined is used, since the lower part of the covering portions 21 and 31 is an opening and no resin is present, while ensuring a specified amount of the thickness of the sealing resin 70, The case 4 can be reduced in size by bringing the case inner surface and the reactor body close to each other.
(2−3)
本実施形態では、図7の(a)(b)に示すように、面取り部12a,12bの表面を覆う被覆部21,31の縁は、開口部21a,31aに露出するU字型コア1a,1bの垂直面11a,11bの表面から突出することがない。そのため、開口部21a,31aの下部において、ケース4の内面をU字型コア1a,1bの下辺に接近させても、被覆部21,31の縁が邪魔になることはなく、ケース4とリアクトル本体との隙間を十分確保できる。
(2-3)
In this embodiment, as shown to Fig.7 (a) (b), the edge of the coating | coated parts 21 and 31 which covers the surface of the chamfering parts 12a and 12b is U-shaped core 1a exposed to opening part 21a, 31a. , 1b does not protrude from the surfaces of the vertical surfaces 11a, 11b. Therefore, even if the inner surface of the case 4 is brought close to the lower sides of the U-shaped cores 1a and 1b below the openings 21a and 31a, the edges of the covering portions 21 and 31 do not get in the way, and the case 4 and the reactor Sufficient clearance with the main body can be secured.
(2−4)
本実施形態では、U字型コア1a,1bは、環状コアの軸方向から加圧成形された圧粉磁心から構成されているため、コイルの軸方向に対する熱伝導率が環状コアの軸方向に対する熱伝導率よりも、30から50%程度優れている。そのため、U字型コア1a,1bの外側面に、底部よりも大きな開口部21a,31aを形成し、その部分で熱伝導率の優れた封止樹脂70と接触させることにより、コイルやコアで発生した熱を、開口部21a,31a−封止樹脂70−ケース4の順で効果的に放出できる。その結果、専らU字型コア1a,1bの底部に設けた開口部21b,31bから放熱していた従来技術に比較して、リアクトルの冷却効率が向上する。
(2-4)
In this embodiment, since the U-shaped cores 1a and 1b are configured by a dust core that is pressure-molded from the axial direction of the annular core, the thermal conductivity with respect to the axial direction of the coil is relative to the axial direction of the annular core. It is about 30 to 50% better than thermal conductivity. Therefore, the openings 21a and 31a larger than the bottom are formed on the outer surfaces of the U-shaped cores 1a and 1b, and the portions are brought into contact with the sealing resin 70 having excellent thermal conductivity. The generated heat can be effectively released in the order of the openings 21a, 31a-sealing resin 70-case 4. As a result, the cooling efficiency of the reactor is improved as compared with the prior art in which heat is radiated exclusively from the openings 21b and 31b provided at the bottoms of the U-shaped cores 1a and 1b.
(2−5)
本実施形態では、U字型コア1a,1bの左右の面取り部12a,12bの底部を接続する樹脂製の連結部21c,31cが形成されているため、U字型コア1a,1bは成型品2,3によって上下、左右から取り囲むように被覆されている。その結果、U字型コア1a,1bと成型品2,3との結合強度が高い利点がある。
(2-5)
In the present embodiment, since the resin connection portions 21c and 31c that connect the bottom portions of the left and right chamfered portions 12a and 12b of the U-shaped cores 1a and 1b are formed, the U-shaped cores 1a and 1b are molded products. 2 and 3 so as to surround from above and below and from the left and right. As a result, there is an advantage that the bonding strength between the U-shaped cores 1a and 1b and the molded products 2 and 3 is high.
2.他の実施形態
本発明は、前記実施形態に限定されるものではなく、下記に示す他の実施形態も包含する。
2. Other Embodiments The present invention is not limited to the above-described embodiments, and includes other embodiments described below.
(1)前記実施形態は、ヨーク部としてU字型コア1a,1bを使用したが、ヨーク部はU字型コアに限定されるものではない。脚部と同様な角柱状やブロック状のコア、角柱状コアやブロック状コアの外側コーナー部を直線状や円弧状に面取りした多角形コア、C型コアのような半円形コアなどを使用できる。 (1) Although the said embodiment used U-shaped core 1a, 1b as a yoke part, a yoke part is not limited to a U-shaped core. A prismatic or block-like core similar to the leg portion, a polygonal core whose outer corners of the prismatic core or block-like core are chamfered linearly or arcuately, a semicircular core such as a C-shaped core can be used. .
(2)環状コアとしては、2つのU字型コアを環状に組み合わせたものや、2つのU字型コアと複数のI字型コアを環状に組み合わせたものを使用できる。環状のコアに、左右の脚部と平行に中心脚を設け、その部分にコイルを巻回したコア(E字型コアと呼ばれる)も使用可能である。 (2) As the annular core, a combination of two U-shaped cores in a ring shape or a combination of two U-shaped cores and a plurality of I-shaped cores in a ring shape can be used. It is also possible to use a core (called an E-shaped core) in which an annular core is provided with a central leg parallel to the left and right leg portions, and a coil is wound around that portion.
(3)ボビン内部にI字型コアを嵌め込んで固定したが、U字型のコアと同様に、I字型コアを成型品2,3内にモールド成型法により埋設しても良い。 (3) Although the I-shaped core is fitted and fixed inside the bobbin, the I-shaped core may be embedded in the molded products 2 and 3 by a molding method similarly to the U-shaped core.
(4)ケースとしては、ケースの内面が、被覆部に形成された開口部の上部から開口部の下部に向かって傾斜しているもの以外に、内面がケースの底面に対して垂直のものを使用することができる。アルミニウム製以外の金属製ケースや、熱伝導性に優れた樹脂製のケースを使用することができる。ケースやその隙間に封止樹脂を充填することなく、環状コアと樹脂成形品及びコイルの組立体のみの実施も、本発明の一形態である。 (4) As the case, in addition to the case where the inner surface of the case is inclined from the upper part of the opening formed in the covering part toward the lower part of the opening, the inner surface is perpendicular to the bottom surface of the case. Can be used. A metal case other than aluminum or a resin case excellent in thermal conductivity can be used. Implementation of only the assembly of the annular core, the resin molded product, and the coil without filling the case and the gap with the sealing resin is also an embodiment of the present invention.
(5)ヨーク部を構成するコアとして、環状コアの軸方向から加圧成形した圧粉磁心を使用することが好ましいが、他の方向から加圧成形した圧粉磁心や、圧粉磁心以外のコアを使用しても、金型使用上の利点は大きい。 (5) As the core constituting the yoke portion, it is preferable to use a dust core pressed from the axial direction of the annular core, but other than the dust core pressed from the other direction or the dust core. Even if the core is used, there are significant advantages in using the mold.
(6)ケース4とリアクトル本体との隙間には、図示のように封止樹脂を全域にわたって充填しても良いし、隙間の一部のみに充填することができる。また、平坦な垂直面に開口部を設ける以外に、垂直面と面取り部の双方や面取り部のみに開口部を設けても良い。更に、U字型コア1a,1bのように脚部を持つコアをモールド成型した樹脂成型品の場合には、脚部のケースと対向する外側面に開口部を設けることができる。 (6) The gap between the case 4 and the reactor main body may be filled with sealing resin over the entire area as shown, or only a part of the gap may be filled. In addition to providing an opening on a flat vertical surface, an opening may be provided on both the vertical surface and the chamfered portion, or only on the chamfered portion. Furthermore, in the case of a resin-molded product obtained by molding a core having legs such as the U-shaped cores 1a and 1b, an opening can be provided on the outer surface facing the case of the legs.
1a,1b…U字型コア
1c,1d…I字型コア
1e…スペーサ
2,3…樹脂成形品
21,31…被覆部
21a,31a,21b,31b…開口部
21c,31c…連結部
22a,22b,32a,32b…ボビン
4…ケース
51a,51b…コイル
52,53…固定金具
52a,53a…ねじ挿入穴
62,63…ねじ
70…封止樹脂
DESCRIPTION OF SYMBOLS 1a, 1b ... U-shaped core 1c, 1d ... I-shaped core 1e ... Spacer 2, 3 ... Resin molded product 21, 31 ... Cover part 21a, 31a, 21b, 31b ... Opening part 21c, 31c ... Connection part 22a, 22b, 32a, 32b ... bobbin 4 ... case 51a, 51b ... coil 52, 53 ... fixing bracket 52a, 53a ... screw insertion hole 62, 63 ... screw 70 ... sealing resin
Claims (5)
前記ヨーク部の周囲には、少なくとも前記ヨーク部を埋設してなる樹脂成形品が設けられ、
前記樹脂成形品には、前記ヨーク部の外側面を覆う被覆部が一体に形成され、
前記ヨーク部の外側面が、前記コイルの軸方向と直交する平坦な垂直面と、その両側に形成された面取り部を備えたものであり、
前記被覆部には、金型内に前記ヨーク部を配置する際の位置決め用の突起がコアに接触する開口部が前記平坦な垂直面の下部に形成され、この開口部は前記ヨーク部の表面が露出していると共に、この開口部は前記環状コアの軸方向に対してアンダーカットにならない形状であり、
前記面取り部の表面が前記樹脂成型品によって被覆され、
前記樹脂成型品の端部が前記平坦な垂直面よりもケース内面側に突出しないことを特徴とするリアクトル。 An annular core composed of a yoke part and a leg part, and a coil wound around the outer periphery of the leg part of the annular core,
Around the yoke portion, the resin molded article is provided formed by embedding at least the yoke portion,
The resin molded article, the coating portion that covers the outer surface of the yoke portion is integrally formed,
The outer surface of the yoke portion includes a flat vertical surface orthogonal to the axial direction of the coil, and chamfered portions formed on both sides thereof.
Wherein the covering portion, the projection for positioning in placing the yoke portion in the mold is formed in the lower portion of the flat vertical surface opening in contact with the core, the opening surface of the yoke portion together There has been exposed, the opening Ri shape der as not to undercut the axial direction of the annular core,
The surface of the chamfered portion is covered with the resin molded product,
An end portion of the resin molded product does not protrude toward the inner surface of the case from the flat vertical surface .
前記ケースの内面が、前記被覆部に形成された前記開口部の上部から、前記開口部の下部に露出している前記ヨーク部の下辺に向かって傾斜し、ケース内面と前記被覆部表面及びケース内面と前記ヨーク部下辺との間に、所定の隙間が形成されていることを特徴とする請求項1に記載のリアクトル。 It said annular core, the resin molded article and a reactor main body made of the coil is accommodated in the case,
The inner surface of the case, said from the top of the opening formed in the covering portion, inclined toward the lower side of the yoke portion which is exposed at the bottom of the opening, the case inner surface and the cover part surface and casing The reactor according to claim 1, wherein a predetermined gap is formed between the inner surface and the lower side of the yoke portion.
前記ヨーク部の底部を覆う前記樹脂成型品とケース内面との隙間に前記封止樹脂が充填されていることを特徴とする請求項3に記載のリアクトル。 Those wherein the resin molding covers the whole or part of the bottom portion of the yoke portion,
Reactor according to claim 3, wherein the sealing resin in a gap between the resin molding and the inner surface of the case to cover the bottom of the yoke portion is filled.
前記ヨーク部が前記環状コアの軸方向から加圧成形された圧粉磁心から構成され、
前記コイルの軸方向に対する熱伝導率が前記環状コアの軸方向に対する熱伝導率よりも優れ、
前記ヨーク部の外側面に形成された前記開口部が前記ヨーク部の底部に形成された前記開口部よりも広い面積で前記封止樹脂と接触していることを特徴とする請求項3または請求項4に記載のリアクトル。
The sealing resin is excellent in thermal conductivity,
The yoke portion is constituted from the pressure molded dust core in the axial direction of the annular core,
Better than the thermal conductivity of the thermal conductivity with respect to the axial direction of the coil with respect to the axial direction of the annular core,
Claim 3 or claim, characterized in that in contact with the sealing resin in larger area than the opening in which the opening formed on the outer surface formed in the bottom of the yoke portion of the yoke portion Item 5. The reactor according to Item 4 .
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JP6593780B2 (en) * | 2017-03-03 | 2019-10-23 | 株式会社オートネットワーク技術研究所 | Reactor |
JP6662347B2 (en) * | 2017-04-27 | 2020-03-11 | 株式会社オートネットワーク技術研究所 | Reactor |
JP6758264B2 (en) * | 2017-08-10 | 2020-09-23 | 株式会社デンソー | Reactor cooling structure |
KR102579858B1 (en) * | 2018-03-30 | 2023-09-18 | 현대자동차주식회사 | High-capacity converter for vehicle |
CN117438180B (en) * | 2023-12-18 | 2024-04-05 | 广东伊戈尔智能电器有限公司 | Inductor forming method and inductor |
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