JP2018174197A - On-vehicle charger - Google Patents

On-vehicle charger Download PDF

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Publication number
JP2018174197A
JP2018174197A JP2017070500A JP2017070500A JP2018174197A JP 2018174197 A JP2018174197 A JP 2018174197A JP 2017070500 A JP2017070500 A JP 2017070500A JP 2017070500 A JP2017070500 A JP 2017070500A JP 2018174197 A JP2018174197 A JP 2018174197A
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screw
insulating sheet
screw insertion
diameter
insertion portion
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室谷　樹一郎
Kiichiro Murotani
樹一郎 室谷
義生 暮石
Yoshio Kureishi
義生 暮石
大貴 三宅
Taiki Miyake
大貴 三宅
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2017070500A priority Critical patent/JP2018174197A/en
Priority to CN201720707994.XU priority patent/CN206895103U/en
Publication of JP2018174197A publication Critical patent/JP2018174197A/en
Pending legal-status Critical Current

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  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Mounting Components In General For Electric Apparatus (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle charger in which insulation properties between a power element and a housing are secured.SOLUTION: A power element 3 is fixed by a screw 4 to the housing 1 via an insulating sheet 2. In the insulating sheet 2, a screw insertion part 2a is formed, into which the screw 4 is inserted. A diameter D2a of the screw insertion part 2a before the screw 4 is inserted is shorter than an outer diameter D4 of the screw 4. Since the screw 4 is inserted while pushing and expanding the screw insertion part 2a, the diameter D2a of the screw insertion part 2a becomes the same as the outer diameter D4 of the screw 4 in a state where the screw 4 is inserted, and a gap between the insulating sheet 2 and the screw 4 is not generated.SELECTED DRAWING: Figure 9

Description

この発明は、パワー素子を有する車載充電器に関するものである。   The present invention relates to an in-vehicle charger having a power element.

パワー素子は、絶縁シートを介してねじおよびナット等で筐体に取り付けられる（例えば、特許文献１参照）。従来は絶縁シートのねじを通す穴の直径が当該ねじの外径より大きく設定されることで、製造ばらつきにより筐体のねじ穴と絶縁シートの穴とに位置ずれがあっても、筐体のねじ穴が絶縁シートで隠れないようになっていた。   The power element is attached to the casing with screws and nuts via an insulating sheet (see, for example, Patent Document 1). Conventionally, the diameter of the hole through which the screw of the insulating sheet is passed is set to be larger than the outer diameter of the screw, so that even if there is a positional deviation between the screw hole of the casing and the hole of the insulating sheet due to manufacturing variations, The screw holes were not hidden by the insulating sheet.

実開平２−５８３９４号公報Japanese Utility Model Publication No. 2-58394

従来は、絶縁シートの穴の直径がねじの外径より大きいため、ねじを締結した状態ではねじと絶縁シートとの間に隙間が生じる。   Conventionally, since the diameter of the hole in the insulating sheet is larger than the outer diameter of the screw, a gap is generated between the screw and the insulating sheet when the screw is fastened.

他方、車載充電器は、車両側スペースに制約があるため小型化が望まれる。そのため、車載充電器においては、１枚の絶縁シート上に複数のパワー素子を配置することによってパワー素子の設置スペースを小さくすることが考えられる。１枚の絶縁シートに複数のねじ用の穴を形成すると、製造ばらつきにより絶縁シートの穴と筐体のねじ穴の位置がずれやすい。絶縁シートの穴と筐体のねじ穴の位置がずれると、ねじを締結した状態ではねじと絶縁シートとの間に隙間が生じる。   On the other hand, the in-vehicle charger is desired to be miniaturized because the space on the vehicle side is limited. Therefore, in the on-vehicle charger, it is conceivable to reduce the installation space of the power element by arranging a plurality of power elements on one insulating sheet. When a plurality of screw holes are formed in one insulating sheet, the positions of the holes in the insulating sheet and the screw holes in the housing are liable to shift due to manufacturing variations. If the positions of the holes of the insulating sheet and the screw holes of the housing are shifted, a gap is generated between the screw and the insulating sheet when the screw is fastened.

上述のように、ねじと絶縁シートとの間に隙間が生じると、絶縁性能が低下して絶縁不良を生じるという課題があった。   As described above, when a gap is generated between the screw and the insulating sheet, there is a problem in that the insulating performance is deteriorated to cause insulation failure.

この発明は、上記のような課題を解決するためになされたもので、パワー素子と筐体との絶縁性が確保された車載充電器を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide an in-vehicle charger in which insulation between a power element and a casing is ensured.

この発明に係る車載充電器は、冷却水が流れる水冷通路を有する筐体と、複数のパワー素子と、複数のパワー素子を筐体に固定する複数のねじと、複数のパワー素子と筐体との間に挟まれる、絶縁性を有する絶縁シートと、絶縁シートに形成された、複数のねじが挿入される複数のねじ挿入部とを備え、複数のねじ挿入部のそれぞれの直径は、ねじが挿入される前はねじの外径より小さく、ねじが挿入された状態ではねじの外径と同じである。   An in-vehicle charger according to the present invention includes a casing having a water cooling passage through which cooling water flows, a plurality of power elements, a plurality of screws for fixing the plurality of power elements to the casing, a plurality of power elements and the casing, An insulating sheet having insulation properties, and a plurality of screw insertion portions formed on the insulating sheet into which a plurality of screws are inserted. Before insertion, it is smaller than the outer diameter of the screw, and when the screw is inserted, it is the same as the outer diameter of the screw.

この発明によれば、絶縁シートに形成された複数のねじ挿入部のそれぞれの直径は、ねじが挿入される前はねじの外径より小さく、ねじが挿入された状態ではねじの外径と同じになるようにしたので、ねじと絶縁シートとの間に隙間が生じず、パワー素子と筐体との絶縁性が確保された車載充電器を提供することができる。   According to this invention, the diameter of each of the plurality of screw insertion portions formed on the insulating sheet is smaller than the outer diameter of the screw before the screw is inserted, and is the same as the outer diameter of the screw when the screw is inserted. Therefore, there is no gap between the screw and the insulating sheet, and an in-vehicle charger in which the insulation between the power element and the housing is ensured can be provided.

この発明の実施の形態１に係る車載充電器の要部を分解した状態を示す斜視図である。It is a perspective view which shows the state which decomposed | disassembled the principal part of the vehicle-mounted charger which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る車載充電器の要部を組み立てた状態を示す斜視図である。It is a perspective view which shows the state which assembled the principal part of the vehicle-mounted charger which concerns on Embodiment 1 of this invention. 図３Ａは、この発明の実施の形態１において筐体に固定されたパワー素子を示す斜視図であり、図３Ｂは、図３ＡのＡ−Ａ線に沿って切断した断面図である。3A is a perspective view showing the power element fixed to the housing in Embodiment 1 of the present invention, and FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A. この発明の実施の形態１においてパワー素子が固定される筐体の構成例を示す平面図である。It is a top view which shows the structural example of the housing | casing to which a power element is fixed in Embodiment 1 of this invention. この発明の実施の形態１における絶縁シートの構成例を示す平面図である。It is a top view which shows the structural example of the insulating sheet in Embodiment 1 of this invention. この発明の実施の形態１において筐体にパワー素子と絶縁シートとが固定された構成例を示す平面図である。It is a top view which shows the structural example by which the power element and the insulating sheet were fixed to the housing | casing in Embodiment 1 of this invention. 図３ＡのＡ−Ａ線に沿って切断した断面図のうち、パワー素子を拡大した図である。It is the figure which expanded the power element among the sectional views cut along the AA line of Drawing 3A. 図８Ａおよび図８Ｂは、この発明の実施の形態１の理解を助けるための参考例であり、絶縁シートのねじ挿入部とねじ断面との位置関係を示す平面図である。8A and 8B are reference examples for helping understanding of the first embodiment of the present invention, and are plan views showing the positional relationship between the screw insertion portion of the insulating sheet and the screw cross section. この発明の実施の形態１における絶縁シートのねじ挿入部の一例を示す平面図である。It is a top view which shows an example of the screw insertion part of the insulating sheet in Embodiment 1 of this invention. この発明の実施の形態２における絶縁シートのねじ挿入部の一例を示す平面図である。It is a top view which shows an example of the screw insertion part of the insulating sheet in Embodiment 2 of this invention. この発明の実施の形態２における絶縁シートのねじ挿入部の別の例を示す平面図である。It is a top view which shows another example of the screw insertion part of the insulating sheet in Embodiment 2 of this invention. この発明の実施の形態２における絶縁シートのねじ挿入部の別の例を示す平面図である。It is a top view which shows another example of the screw insertion part of the insulating sheet in Embodiment 2 of this invention. この発明の実施の形態２における絶縁シートのねじ挿入部の別の例を示す平面図である。It is a top view which shows another example of the screw insertion part of the insulating sheet in Embodiment 2 of this invention.

実施の形態１．
図１は、この発明の実施の形態１に係る車載充電器の要部を分解した状態を示す斜視図である。図２は、この発明の実施の形態１に係る車載充電器の要部を組み立てた状態を示す斜視図である。図３Ａは、この発明の実施の形態１において筐体１に固定されたパワー素子３を示す斜視図であり、図３Ｂは、図３ＡのＡ−Ａ線に沿って切断した断面図である。実施の形態１に係る車載充電器は、筐体１、絶縁シート２、パワー素子３、ねじ４、基板５、および水冷通路６を備える。この車載充電器は、例えば、プラグインハイブリッド自動車（ＰＨＶ）に搭載されるＯＢＣ（Ｏｎ Ｂｏａｒｄ Ｃｈａｒｇｅｒ）である。ＯＢＣは、基板５に実装されたパワー素子３および不図示の電子部品を用いて、外部電源の電圧をＰＨＶの駆動用バッテリの充電用電圧に変換する機能を果たすものである。 Embodiment 1 FIG.
1 is a perspective view showing a state in which a main part of an in-vehicle charger according to Embodiment 1 of the present invention is disassembled. FIG. 2 is a perspective view showing a state in which main parts of the in-vehicle charger according to Embodiment 1 of the present invention are assembled. 3A is a perspective view showing power element 3 fixed to housing 1 in Embodiment 1 of the present invention, and FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A. The in-vehicle charger according to Embodiment 1 includes a housing 1, an insulating sheet 2, a power element 3, a screw 4, a substrate 5, and a water cooling passage 6. This in-vehicle charger is, for example, an OBC (On Board Charger) mounted on a plug-in hybrid vehicle (PHV). The OBC performs the function of converting the voltage of the external power source into the charging voltage of the PHV driving battery by using the power element 3 mounted on the substrate 5 and an electronic component (not shown).

筐体１は、一面が開口した箱状の金属部材である。筐体１の開口部には基板５が設置される。筐体１の内部には、開口部と対向する平面部７が形成されている。平面部７の内部には、筐体１の外部と連通した水冷通路６が形成される。水冷通路６は、通路内に冷却水を流すことで筐体１を冷却するものである。また、平面部７には、５つのパワー素子３が絶縁シート２を介して５つのねじ４で固定される。パワー素子３は、例えば、ダイオード、トランジスタ、またはＭＯＳＦＥＴ（Ｍｅｔａｌ Ｏｘｉｄｅ Ｓｅｍｉｃｏｎｄｕｃｔｏｒ Ｆｉｅｌｄ Ｅｆｆｅｃｔ Ｔｒａｎｓｉｓｔｏｒ）などである。パワー素子３の電極３ａはＬ字状に折り曲げられている。電極３ａの先端部は、基板５に形成された貫通孔に通された状態ではんだ付けされる。   The housing 1 is a box-shaped metal member that is open on one side. A substrate 5 is installed in the opening of the housing 1. A flat surface portion 7 that faces the opening is formed inside the housing 1. A water cooling passage 6 communicating with the outside of the housing 1 is formed inside the flat portion 7. The water cooling passage 6 cools the housing 1 by flowing cooling water through the passage. Further, the five power elements 3 are fixed to the plane portion 7 with the five screws 4 through the insulating sheet 2. The power element 3 is, for example, a diode, a transistor, or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The electrode 3a of the power element 3 is bent in an L shape. The tip of the electrode 3a is soldered in a state of being passed through a through hole formed in the substrate 5.

次に、パワー素子３を筐体１に固定する構造を説明する。
図４は、この発明の実施の形態１においてパワー素子３が固定される筐体１の構成例を示す平面図である。図５は、この発明の実施の形態１における絶縁シート２の構成例を示す平面図である。図６は、この発明の実施の形態１において筐体１にパワー素子３と絶縁シート２とが固定された構成例を示す平面図である。図７は、図３ＡのＡ−Ａ線に沿って切断した断面図のうち、パワー素子３を拡大した図である。図４および図５は、パワー素子３が固定される前の状態を示す。図６および図７は、パワー素子３が固定された状態を示す。 Next, a structure for fixing the power element 3 to the housing 1 will be described.
FIG. 4 is a plan view showing a configuration example of the housing 1 to which the power element 3 is fixed in the first embodiment of the present invention. FIG. 5 is a plan view showing a configuration example of the insulating sheet 2 according to Embodiment 1 of the present invention. FIG. 6 is a plan view showing a configuration example in which the power element 3 and the insulating sheet 2 are fixed to the housing 1 in the first embodiment of the present invention. FIG. 7 is an enlarged view of the power element 3 in the cross-sectional view taken along the line AA of FIG. 3A. 4 and 5 show a state before the power element 3 is fixed. 6 and 7 show a state in which the power element 3 is fixed.

図４および図５に示すように、筐体１の平面部７には、５つのねじ穴１ａが形成される。また、平面部７の両端部には、２つの位置決めボス１ｂが形成される。絶縁シート２には、平面部７の５つのねじ穴１ａと相対する５つのねじ挿入部２ａが形成される。また、絶縁シート２の両端部には、平面部７の２つの位置決めボス１ｂと相対する２つの位置決め穴２ｂが形成される。平面部７の上に絶縁シート２が配置された際、各位置決めボス１ｂと各位置決め穴２ｂとが係合することにより、平面部７に対して絶縁シート２が位置決めされる。   As shown in FIGS. 4 and 5, five screw holes 1 a are formed in the flat portion 7 of the housing 1. In addition, two positioning bosses 1b are formed at both ends of the flat surface portion 7. In the insulating sheet 2, five screw insertion portions 2 a facing the five screw holes 1 a of the plane portion 7 are formed. Further, two positioning holes 2 b facing the two positioning bosses 1 b of the flat surface portion 7 are formed at both ends of the insulating sheet 2. When the insulating sheet 2 is disposed on the flat portion 7, the insulating sheet 2 is positioned with respect to the flat portion 7 by engaging the positioning bosses 1b and the positioning holes 2b.

図６および図７に示すように、１枚の絶縁シート２の上に５つのパワー素子３が配置される。絶縁性を有する絶縁シート２は、金属製の平面部７とパワー素子３の背面側の電極３ｂとの間に挟まれて、平面部７と電極３ｂとを絶縁する。ねじ４は、パワー素子３の貫通穴３ｃを貫通して絶縁シート２のねじ挿入部２ａに挿入し、平面部７のねじ穴１ａに締結する。ねじ４がねじ穴１ａに締結することで、パワー素子３は絶縁シート２を介して平面部７に固定される。パワー素子３が発する熱は、平面部７を経由して水冷通路６に放熱される。   As shown in FIGS. 6 and 7, five power elements 3 are arranged on one insulating sheet 2. The insulating sheet 2 having insulating properties is sandwiched between the flat surface portion 7 made of metal and the electrode 3b on the back side of the power element 3, and insulates the flat surface portion 7 and the electrode 3b. The screw 4 passes through the through hole 3 c of the power element 3, is inserted into the screw insertion portion 2 a of the insulating sheet 2, and is fastened to the screw hole 1 a of the flat portion 7. When the screw 4 is fastened to the screw hole 1a, the power element 3 is fixed to the flat surface portion 7 via the insulating sheet 2. The heat generated by the power element 3 is radiated to the water cooling passage 6 via the flat portion 7.

先立って説明したように、車載充電器は、車両側スペースに制約があるため小型化が望まれる。そのため、複数のパワー素子３を設置するスペースを小さくする必要がある。実施の形態１では、１枚の絶縁シート２上に複数のパワー素子３を並べて配置することにより、位置決めボス１ｂおよび位置決め穴２ｂ等の個数を減らすことができ、省スペース化を図ることができる。なお、実施の形態１では、１枚の絶縁シート２上に５つのパワー素子３を並べて配置する構成を示すが、パワー素子３の個数は任意でよい。しかしながら、絶縁シート２を１枚にすると、ねじ穴１ａ、位置決めボス１ｂ、ねじ挿入部２ａ、および位置決め穴２ｂ等の製造ばらつきによってねじ穴１ａの位置とねじ挿入部２ａの位置とがずれやすい。   As previously described, the in-vehicle charger is desired to be downsized because the vehicle-side space is limited. Therefore, it is necessary to reduce the space for installing the plurality of power elements 3. In the first embodiment, by arranging a plurality of power elements 3 side by side on a single insulating sheet 2, the number of positioning bosses 1b, positioning holes 2b, etc. can be reduced, and space saving can be achieved. . Although Embodiment 1 shows a configuration in which five power elements 3 are arranged side by side on one insulating sheet 2, the number of power elements 3 may be arbitrary. However, when the insulating sheet 2 is made into one sheet, the position of the screw hole 1a and the position of the screw insertion part 2a are likely to be shifted due to manufacturing variations of the screw hole 1a, the positioning boss 1b, the screw insertion part 2a, the positioning hole 2b, and the like.

図８Ａおよび図８Ｂは、この発明の実施の形態１の理解を助けるための参考例であり、絶縁シート２のねじ挿入部２ａとねじ４の断面との位置関係を示す平面図である。図８Ａの参考例では、ねじ４の外径Ｄ４が絶縁シート２のねじ挿入部２ａの直径Ｄ２ａより小さい。そのため、ねじ穴１ａにねじ４が締結された状態において、ねじ４外周とねじ挿入部２ａ内周との間に隙間が生じ、平面部７が露出する。図８Ｂの参考例では、図８Ａに示された直径のねじ穴１ａとねじ挿入部２ａとに製造ばらつきによる位置ずれが生じ、ねじ４がねじ挿入部２ａの端に寄っている。すると、ねじ４外周とねじ挿入部２ａ内周との間に大きな隙間が生じ、隙間から露出した平面部７とパワー素子３の電極３ｂとの絶縁距離が確保できず絶縁不良を生じる。   8A and 8B are reference examples for helping understanding of the first embodiment of the present invention, and are plan views showing the positional relationship between the screw insertion portion 2a of the insulating sheet 2 and the cross section of the screw 4. FIG. In the reference example of FIG. 8A, the outer diameter D4 of the screw 4 is smaller than the diameter D2a of the screw insertion portion 2a of the insulating sheet 2. Therefore, in a state where the screw 4 is fastened to the screw hole 1a, a gap is generated between the outer periphery of the screw 4 and the inner periphery of the screw insertion portion 2a, and the flat portion 7 is exposed. In the reference example shown in FIG. 8B, the screw hole 1a having the diameter shown in FIG. 8A and the screw insertion portion 2a are displaced due to manufacturing variations, and the screw 4 approaches the end of the screw insertion portion 2a. Then, a large gap is generated between the outer periphery of the screw 4 and the inner periphery of the screw insertion portion 2a, and the insulation distance between the flat portion 7 exposed from the gap and the electrode 3b of the power element 3 cannot be secured, resulting in an insulation failure.

そこで、実施の形態１では、ねじ４が挿入される前の状態における絶縁シート２のねじ挿入部２ａの直径Ｄ２ａを、ねじ４の外径Ｄ４より小さくする。
図９は、この発明の実施の形態１における絶縁シート２のねじ挿入部２ａの一例を示す平面図である。図９に示されるねじ挿入部２ａは、十字状の切れ込みである。この切れ込みに接する仮想的な外接円の直径をねじ挿入部２ａの直径Ｄ２ａとし、ねじ４の山の頂に接する仮想的な円筒の直径をねじ４の外径Ｄ４とした場合、ねじ挿入部２ａの直径Ｄ２ａはねじ４の外径Ｄ４より小さい。ねじ４の締結時、ねじ４は、ねじ挿入部２ａを押し広げて挿入し、ねじ挿入部２ａの周縁の絶縁シート２を巻き込みつつ平面部７のねじ穴１ａに締結する。ねじ４が締結した状態では、ねじ挿入部２ａの直径Ｄ２ａとねじ４の外径Ｄ４とは同じになる。そのため、仮に製造ばらつきによる位置ずれが生じたとしても、ねじ挿入部２ａの内周とねじ４の外周との間に隙間は生じず、平面部７とパワー素子３の電極３ｂとの絶縁性が確保される。 Thus, in the first embodiment, the diameter D2a of the screw insertion portion 2a of the insulating sheet 2 before the screw 4 is inserted is made smaller than the outer diameter D4 of the screw 4.
FIG. 9 is a plan view showing an example of the screw insertion portion 2a of the insulating sheet 2 according to Embodiment 1 of the present invention. The screw insertion portion 2a shown in FIG. 9 is a cross-shaped cut. When the diameter of the virtual circumscribed circle in contact with the notch is the diameter D2a of the screw insertion portion 2a and the diameter of the virtual cylinder in contact with the top of the screw 4 is the outer diameter D4 of the screw 4, the screw insertion portion 2a The diameter D2a is smaller than the outer diameter D4 of the screw 4. When the screw 4 is fastened, the screw 4 is inserted by expanding the screw insertion portion 2a, and is fastened to the screw hole 1a of the flat surface portion 7 while winding the insulating sheet 2 around the periphery of the screw insertion portion 2a. In the state where the screw 4 is fastened, the diameter D2a of the screw insertion portion 2a and the outer diameter D4 of the screw 4 are the same. Therefore, even if misalignment occurs due to manufacturing variations, there is no gap between the inner periphery of the screw insertion portion 2a and the outer periphery of the screw 4, and the insulation between the flat portion 7 and the electrode 3b of the power element 3 is achieved. Secured.

以上のように、実施の形態１に係る車載充電器は、冷却水が流れる水冷通路６を有する筐体１と、５つのパワー素子３と、５つのパワー素子３を筐体１に固定する５つのねじ４と、５つのパワー素子３と筐体１との間に挟まれる、絶縁性を有する絶縁シート２と、絶縁シート２に形成された、５つのねじ４が挿入される５つのねじ挿入部２ａとを備える。５つのねじ挿入部２ａのそれぞれの直径Ｄ２ａは、ねじ４が挿入される前はこのねじ４の外径Ｄ４より小さく、ねじ４が挿入された状態ではこのねじ４の外径Ｄ４と同じになる。これにより、ねじ４と絶縁シート２との間に隙間が生じず、パワー素子３と筐体１との絶縁性が確保された車載充電器を提供することができる。   As described above, the on-vehicle charger according to the first embodiment includes the casing 1 having the water cooling passage 6 through which the cooling water flows, the five power elements 3, and the five power elements 3 fixed to the casing 1. Insulating sheet 2 having insulating properties sandwiched between two screws 4, five power elements 3 and housing 1, and five screw insertions into which five screws 4 formed in insulating sheet 2 are inserted Part 2a. The diameter D2a of each of the five screw insertion portions 2a is smaller than the outer diameter D4 of the screw 4 before the screw 4 is inserted, and becomes the same as the outer diameter D4 of the screw 4 when the screw 4 is inserted. . Thereby, a space | gap does not arise between the screw | thread 4 and the insulating sheet 2, but the vehicle-mounted charger with which the insulation of the power element 3 and the housing | casing 1 was ensured can be provided.

また、実施の形態１のねじ挿入部２ａは、ねじ４が挿入される前の状態においてこのねじ４の外径Ｄ４よりも小さい直径Ｄ２ａを有する切れ込みである。これにより、ねじ４の締結時にねじ４が絶縁シート２を巻き込むようになり、ねじ４が締結した状態においてねじ４と絶縁シート２との間には隙間がない。
なお、図９では、ねじ挿入部２ａを十字状の切れ込みにしたが、切れ込みの形状は十字に限定されるものではない。 Moreover, the screw insertion part 2a of Embodiment 1 is a notch having a diameter D2a smaller than the outer diameter D4 of the screw 4 before the screw 4 is inserted. Thereby, the screw 4 comes to wind the insulating sheet 2 when the screw 4 is fastened, and there is no gap between the screw 4 and the insulating sheet 2 when the screw 4 is fastened.
In FIG. 9, the screw insertion portion 2a has a cross-shaped cut, but the shape of the cut is not limited to a cross.

実施の形態２．
実施の形態２では、絶縁シート２のねじ挿入部２ａの変形例を説明する。
図１０〜１２は、この発明の実施の形態２に係る車載充電器における絶縁シート２のねじ挿入部２ａの一例を示す平面図である。実施の形態２に係る車載充電器において、ねじ挿入部２ａの形状以外は実施の形態１に係る車載充電器と同じである。 Embodiment 2. FIG.
In the second embodiment, a modified example of the screw insertion portion 2a of the insulating sheet 2 will be described.
FIGS. 10-12 is a top view which shows an example of the screw insertion part 2a of the insulating sheet 2 in the vehicle-mounted charger which concerns on Embodiment 2 of this invention. The in-vehicle charger according to the second embodiment is the same as the in-vehicle charger according to the first embodiment except for the shape of the screw insertion portion 2a.

図１０に示されるねじ挿入部２ａは、円形状の穴である。この穴の直径をねじ挿入部２ａの直径Ｄ２ａとした場合、ねじ挿入部２ａの直径Ｄ２ａはねじ４の外径Ｄ４より小さい。   The screw insertion portion 2a shown in FIG. 10 is a circular hole. When the diameter of this hole is the diameter D2a of the screw insertion portion 2a, the diameter D2a of the screw insertion portion 2a is smaller than the outer diameter D4 of the screw 4.

図１１に示されるねじ挿入部２ａは、５つの頂点を有する星形状の穴である。５つの頂点に接する仮想的な外接円の直径をねじ挿入部２ａの直径Ｄ２ａとした場合、ねじ挿入部２ａの直径Ｄ２ａはねじ４の外径Ｄ４より小さい。   The screw insertion portion 2a shown in FIG. 11 is a star-shaped hole having five vertices. When the diameter of a virtual circumscribed circle in contact with the five apexes is the diameter D2a of the screw insertion portion 2a, the diameter D2a of the screw insertion portion 2a is smaller than the outer diameter D4 of the screw 4.

図１２に示されるねじ挿入部２ａは、４つの頂点を有する星形状の穴である。４つの頂点に接する仮想的な外接円の直径をねじ挿入部２ａの直径Ｄ２ａとした場合、ねじ挿入部２ａの直径Ｄ２ａはねじ４の外径Ｄ４より小さい。   The screw insertion portion 2a shown in FIG. 12 is a star-shaped hole having four vertices. When the diameter of a virtual circumscribed circle in contact with the four apexes is the diameter D2a of the screw insertion portion 2a, the diameter D2a of the screw insertion portion 2a is smaller than the outer diameter D4 of the screw 4.

図１０〜図１２において、ねじ４の締結時、ねじ４は、ねじ挿入部２ａを押し広げて挿入し、ねじ挿入部２ａの周縁の絶縁シート２を巻き込みつつ平面部７のねじ穴１ａに締結する。ただし、図１０〜図１２に示されたねじ挿入部２ａは穴であるため、図９に示された十字状の切れ込みに比べて巻き込み量が少ない。そのため、ねじ４をスムーズに締結可能である。また、ねじ４が締結した状態では、ねじ挿入部２ａの直径Ｄ２ａとねじ４の外径Ｄ４とは同じになる。そのため、仮に製造ばらつきによる位置ずれが生じたとしても、ねじ挿入部２ａの内周とねじ４の外周との間に隙間は生じず、平面部７とパワー素子３の電極３ｂとの絶縁性が確保される。
なお、ねじ挿入部２ａの穴の形状は、図１０〜図１２に示された形状に限定されるものではない。 10 to 12, when the screw 4 is fastened, the screw 4 is inserted by expanding the screw insertion portion 2 a, and is fastened to the screw hole 1 a of the flat portion 7 while winding the insulating sheet 2 around the periphery of the screw insertion portion 2 a. To do. However, since the screw insertion portion 2a shown in FIGS. 10 to 12 is a hole, the amount of entanglement is small compared to the cross-shaped cut shown in FIG. Therefore, the screw 4 can be fastened smoothly. Moreover, in the state in which the screw 4 is fastened, the diameter D2a of the screw insertion portion 2a and the outer diameter D4 of the screw 4 are the same. Therefore, even if misalignment occurs due to manufacturing variations, there is no gap between the inner periphery of the screw insertion portion 2a and the outer periphery of the screw 4, and the insulation between the flat portion 7 and the electrode 3b of the power element 3 is achieved. Secured.
In addition, the shape of the hole of the screw insertion part 2a is not limited to the shape shown by FIGS.

図１０〜図１２において、製造ばらつきによるねじ穴１ａとねじ挿入部２ａとの位置ずれの平均値または最大値が判明している場合、ねじ挿入部２ａの直径Ｄ２ａとねじ４の外径Ｄ４との差を、位置ずれの平均値または最大値の２倍以上の値に設定することが望ましい。例えば、位置ずれが平均０．２５ｍｍ生じる場合、ねじ挿入部２ａの直径Ｄ２ａをねじ４の外径Ｄ４より０．５ｍｍ以上小さくすればよい。これにより、位置ずれが生じたとしてもねじ挿入部２ａはねじ穴１ａの開口面内を移動するにとどまり、ねじ挿入部２ａから平面部７が露出することはない。そのため、ねじ４が締結した状態では、ねじ挿入部２ａの内周とねじ４の外周との間には隙間が生じない。   10 to 12, when the average value or the maximum value of the positional deviation between the screw hole 1a and the screw insertion portion 2a due to manufacturing variations is known, the diameter D2a of the screw insertion portion 2a and the outer diameter D4 of the screw 4 It is desirable to set the difference between these values to a value that is at least twice the average value or the maximum value of the positional deviations. For example, when the positional deviation occurs on average 0.25 mm, the diameter D2a of the screw insertion portion 2a may be smaller than the outer diameter D4 of the screw 4 by 0.5 mm or more. Thereby, even if a position shift occurs, the screw insertion portion 2a only moves within the opening surface of the screw hole 1a, and the flat portion 7 is not exposed from the screw insertion portion 2a. Therefore, when the screw 4 is fastened, there is no gap between the inner periphery of the screw insertion portion 2a and the outer periphery of the screw 4.

なお、実施の形態１の図９に示された切れ込み状のねじ挿入部２ａについても、ねじ挿入部２ａの直径Ｄ２ａとねじ４の外径Ｄ４との差を、位置ずれの平均値または最大値の２倍以上の値に設定することは可能である。ただし、ねじ挿入部２ａは切れ込みであるため、ねじ穴１ａとねじ挿入部２ａとに位置ずれが生じたとしても平面部７が露出することはなく、絶縁性が確保される。そのため、ねじ挿入部２ａが切れ込みである場合、ねじ挿入部２ａの直径Ｄ２ａをねじ４の外径Ｄ４より０．５ｍｍ以上小さくする必要性は、ねじ挿入部２ａが穴である場合に比べて低い。   Note that the difference between the diameter D2a of the screw insertion portion 2a and the outer diameter D4 of the screw 4 is the average value or the maximum value of the positional deviation in the notched screw insertion portion 2a shown in FIG. 9 of the first embodiment. It is possible to set the value to more than twice the value. However, since the screw insertion portion 2a is notched, the planar portion 7 is not exposed even if a positional shift occurs between the screw hole 1a and the screw insertion portion 2a, and insulation is ensured. Therefore, when the screw insertion part 2a is notched, the need to make the diameter D2a of the screw insertion part 2a 0.5 mm or more smaller than the outer diameter D4 of the screw 4 is lower than when the screw insertion part 2a is a hole. .

また、ねじ挿入部２ａは、切れ込みと穴とが組み合わさった形状であってもよい。図１３は、この発明の実施の形態２における絶縁シート２のねじ挿入部２ａの別の例を示す平面図である。図１３に示されるねじ挿入部２ａは、十字状の切れ込みと円形状の穴とが組み合わさった形状である。切れ込みに接する仮想的な外接円の直径をねじ挿入部２ａの直径Ｄ２ａとした場合、ねじ挿入部２ａの直径Ｄ２ａはねじ４の外径Ｄ４より小さい。
なお、ねじ挿入部２ａの切れ込みと穴の形状は、図１３に示された形状に限定されるものではない。 The screw insertion portion 2a may have a shape in which a cut and a hole are combined. FIG. 13 is a plan view showing another example of the screw insertion portion 2a of the insulating sheet 2 according to Embodiment 2 of the present invention. The screw insertion portion 2a shown in FIG. 13 has a shape in which a cross-shaped cut and a circular hole are combined. When the diameter of the virtual circumscribed circle in contact with the notch is the diameter D2a of the screw insertion portion 2a, the diameter D2a of the screw insertion portion 2a is smaller than the outer diameter D4 of the screw 4.
In addition, the notch | incision of the screw insertion part 2a and the shape of a hole are not limited to the shape shown by FIG.

本発明はその発明の範囲内において、各実施の形態の自由な組み合わせ、各実施の形態の任意の構成要素の変形、または各実施の形態の任意の構成要素の省略が可能である。   Within the scope of the invention, the present invention can be freely combined with each embodiment, modified with any component in each embodiment, or omitted with any component in each embodiment.

１ 筐体、１ａ ねじ穴、１ｂ 位置決めボス、２ 絶縁シート、２ａ ねじ挿入部、２ｂ 位置決め穴、３ パワー素子、３ａ，３ｂ 電極、３ｃ 貫通穴、４ ねじ、５ 基板、６ 水冷通路、７ 平面部、Ｄ２ａ ねじ挿入部の直径、Ｄ４ ねじの外径。   DESCRIPTION OF SYMBOLS 1 Case, 1a Screw hole, 1b Positioning boss, 2 Insulation sheet, 2a Screw insertion part, 2b Positioning hole, 3 Power element, 3a, 3b Electrode, 3c Through-hole, 4 Screw, 5 Substrate, 6 Water cooling passage, 7 Plane Part, diameter of D2a screw insertion part, outer diameter of D4 screw.

Claims (4)

冷却水が流れる水冷通路を有する筐体と、
複数のパワー素子と、
前記複数のパワー素子を前記筐体に固定する複数のねじと、
前記複数のパワー素子と前記筐体との間に挟まれる、絶縁性を有する絶縁シートと、
前記絶縁シートに形成された、前記複数のねじが挿入される複数のねじ挿入部とを備え、
前記複数のねじ挿入部のそれぞれの直径は、前記ねじが挿入される前は前記ねじの外径より小さく、前記ねじが挿入された状態では前記ねじの外径と同じであることを特徴とする車載充電器。 A housing having a water cooling passage through which cooling water flows;
A plurality of power elements;
A plurality of screws for fixing the plurality of power elements to the housing;
An insulating sheet having an insulating property, sandwiched between the plurality of power elements and the housing;
A plurality of screw insertion portions formed on the insulating sheet and into which the plurality of screws are inserted;
A diameter of each of the plurality of screw insertion portions is smaller than an outer diameter of the screw before the screw is inserted, and is the same as an outer diameter of the screw when the screw is inserted. Car charger. 前記複数のねじ挿入部のそれぞれは、前記ねじが挿入される前の状態において前記ねじの外径よりも小さい直径を有する切れ込みであることを特徴とする請求項１記載の車載充電器。   2. The in-vehicle charger according to claim 1, wherein each of the plurality of screw insertion portions is a cut having a diameter smaller than an outer diameter of the screw in a state before the screw is inserted. 前記複数のねじ挿入部のそれぞれは、前記ねじが挿入される前の状態において前記ねじの外径よりも小さい直径を有する穴であることを特徴とする請求項１記載の車載充電器。   2. The on-vehicle charger according to claim 1, wherein each of the plurality of screw insertion portions is a hole having a diameter smaller than an outer diameter of the screw in a state before the screw is inserted. 前記ねじが挿入される前の状態において前記穴の直径は前記ねじの外径より０．５ｍｍ以上小さいことを特徴とする請求項３記載の車載充電器。   The in-vehicle charger according to claim 3, wherein the diameter of the hole is 0.5 mm or more smaller than the outer diameter of the screw in a state before the screw is inserted.
JP2017070500A 2017-03-31 2017-03-31 On-vehicle charger Pending JP2018174197A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021075030A1 (en) * 2019-10-17 2021-04-22 三菱電機株式会社 Vehicle-mounted charger and manufacturing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021075030A1 (en) * 2019-10-17 2021-04-22 三菱電機株式会社 Vehicle-mounted charger and manufacturing method

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