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    • 10. 发明授权
    • Transformer with tapered core
    • 变压器带锥形铁心
    • US4893105A
    • 1990-01-09
    • US212643
    • 1988-06-28
    • Tsutomu MaedaKiyoshi MatsuiTakayuki KannoKunihiro Sato
    • Tsutomu MaedaKiyoshi MatsuiTakayuki KannoKunihiro Sato
    • H01F38/12
    • H01F38/12H01F2038/122
    • In a transformer including a low-voltage input coil, a high-voltage output coil disposed coaxially of the low-voltage input coil, and a core for magnetically connecting both of the coils together; the improvement comprising a first bobbin around which the low-voltage input coil is wound which first bobbin has an inner-diameter hole, wherein the core comprises a rod portion to be inserted into the inner-diameter hole of the first bobbin and a flange portion provided at one axial end of the rod portion. In another aspect of the invention, the transformer further comprises a second bobbin around which the high-voltage output coil is wound, and a connector adapted to be connected to an ignition plug which connector is mounted on an end surface of the second bobbin on the opposite side of the flange portion of the core in such a manner that a mounting direction of the connector substantially coincides with an axial direction of the second bobbin. In a further aspect of the invention, the transformer further comprises a shield case formed of a magnetic conductive material surrounding an outer periphery of the connector or entirely surrounding the transformer. The rod portion of the core may have a tapering cross section such that it is gradually tapered from a low voltage side of the high-voltage output coil to a high voltage side thereof. With this arrangement, the transformer may be easily assembled and made compact. Further, a magnetic efficiency may be improved, and an insulating distance between the low-voltage input coil and the high-voltage output coil may be ensured.
    • 在包括低压输入线圈的变压器中,与低压输入线圈同轴配置的高压输出线圈和用于将两个线圈磁连接在一起的铁芯; 所述改进包括第一线轴,所述低压输入线圈缠绕在所述第一线轴上,所述第一线轴具有内径孔,其中所述芯包括插入所述第一线轴的内径孔中的杆部分和凸缘部分 设置在杆部分的一个轴向端部。 在本发明的另一方面,变压器还包括绕其高压输出线圈的第二线轴,以及适于连接到火花塞的连接器,该连接器安装在第二线轴的端面上 芯的凸缘部分的相对侧使得连接器的安装方向基本上与第二线轴的轴向方向一致。 在本发明的另一方面,变压器还包括由围绕连接器的外周围或整个围绕变压器的磁性导电材料形成的屏蔽壳。 芯的杆部可以具有锥形横截面,使得其从高压输出线圈的低压侧逐渐变细到高压侧。 通过这种布置,变压器可以容易地组装和制造得紧凑。 此外,可以提高磁效率,并且可以确保低电压输入线圈和高压输出线圈之间的绝缘距离。