To further increase a heat radiation amount from a switching element included in a motor unit to improve reliability of the motor unit.SOLUTION: A motor unit 2 for an electric bicycle includes a motor 4, a switching element 62 for driving the motor 4, a substrate 61 having a surface including a mounting surface 613 for mounting the switching element 62 and an opposite surface facing opposite to the surface including the mounting surface, and a case 3 accommodating the substrate 61. The substrate 61 further has a through hole 614 passing through between the mounting surface 613 and the opposite surface and metal foil 64 covering at least a part of an inner peripheral surface of the through hole 614. The switching element 62 is thermally connected to the metal foil 64. A portion of the case 3 opposite to the switching element 62 while interposing the substrate 61 therebetween is thermally connected to the metal foil 64 .SELECTED DRAWING: Figure 4

    【課題】モータユニットが備えるスイッチング素子からの放熱量を更に増大させ、モータユニットの信頼性を高める。【解決手段】電動自転車用のモータユニット2は、モータ4と、モータ4を駆動させるためのスイッチング素子62と、スイッチング素子62を実装するための実装面613を含んだ面と、該面とは反対を向く反対面とを有する基板61と、基板61を収容するケース3と、を備える。基板61は、実装面613と反対面との間で貫通した貫通孔614と、貫通孔614の内周面の少なくとも一部を覆う金属箔64と、を更に有する。金属箔64に対して、スイッチング素子62が熱的に接続され、かつ、金属箔64に対して、ケース3のうち基板61を挟んでスイッチング素子62とは反対側の部分が、熱的に接続されている。【選択図】図4


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    Title :

    MOTOR UNIT AND ELECTRIC BICYCLE


    Additional title:

    モータユニット及び電動自転車


    Contributors:

    Publication date :

    2023-04-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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