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    • 3. 发明申请
    • IGNITION COIL UNIT FOR ENGINE AND ENGINE PROVIDED WITH PLASTIC HEAD COVER
    • 发动机和发动机用塑料头盖的点火线圈单元
    • WO98053467A1
    • 1998-11-26
    • PCT/JP1998/002244
    • 1998-05-22
    • F02P3/02F02P3/04F02P13/00H01F27/32H01F38/12H01T13/44F02P15/00
    • H01T13/44F02D2400/18F02P3/02F02P3/0435F02P11/00F02P13/00H01F27/022H01F27/29H01F27/325H01F27/327H01F27/40H01F38/12H01F41/064H01F2005/025H01F2038/122H01F2038/125H01F2038/127
    • An ignition coil unit for engines wherein the diameter of a coil of an independently ignitable ignition coil unit is reduced by improving resistance to thermal shock and relaxation of static focusing, i.e. insulation, between a secondary coil and a center core of the unit. The unit can be applied to an engine provided with a plastic head cover, and workability in assembling the unit can be improved. A secondary coil (3) is disposed inside a primary coil (5), and a soft epoxy resin (17) is filled between a secondary bobbin (2) and a center core (1). The bobbin (2) is designed so that the epoxy resin (17) is filled from the lower-voltage side of the secondary coil. The inside diameter of the bobbin (2) is tapered in such a manner that the lower-voltage side of the secondary coil is wider than the higher-voltage side, so that the thickness on the lower-voltage side of the secondary coil is decreased and the thickness on the higher-voltage side is increased. The epoxy resin (17) has a recess (17') formed by pressure-molding, and has a value Tg that satisfies the condition that an allowable stress of the secondary bobbin is greater than a stress caused at -40 DEG C minus the glass transition point (Tg) of insulating resin. The bobbin (2) is made of PPS, and the primary coil is wound with a primary bobbin set outside the secondary coil assembly to wind both as an assembly.
    • 一种用于发动机的点火线圈单元,其中通过提高耐冲击性和减轻单元的次级线圈和中心芯之间的静态聚焦(即绝缘)来降低独立点火线圈单元的线圈直径。 该单元可以应用于设置有塑料盖罩的发动机,并且可以提高组装单元的可加工性。 次级线圈(3)设置在初级线圈(5)的内部,软性环氧树脂(17)填充在次级线轴(2)和中心芯(1)之间。 线轴(2)被设计成使得环氧树脂(17)从次级线圈的低压侧填充。 线轴(2)的内径以次级线圈的低压侧比高压侧宽的方式变细,使次级线圈的低压侧的厚度减小 并且高压侧的厚度增加。 环氧树脂(17)具有通过加压成形而形成的凹部(17'),并且具有满足副线轴的容许应力大于在-40℃下减少玻璃的应力的条件的值Tg 绝缘树脂的转变点(Tg)。 线轴(2)由PPS制成,初级线圈缠绕在次级线圈组件外侧的主要线圈架,以作为组件缠绕。