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    • 51. 发明专利
    • Ignition coil for internal combustion engines
    • 用于内燃机的点火线圈
    • JP2005026485A
    • 2005-01-27
    • JP2003190810
    • 2003-07-03
    • Hitachi Car Eng Co LtdHitachi Ltd株式会社日立カーエンジニアリング株式会社日立製作所
    • OTAKA YASUNORIYASUKURA YOICHIHASHIMOTO MANABUNANAI TETSUO
    • H01F38/12
    • PROBLEM TO BE SOLVED: To provide a highly reliable ignition coil for an internal combustion engine superior not only to a thermal shock resistance but also to a resistance for the shock from the outside. SOLUTION: A cover 18 is formed by a thermoplastic synthetic resin. The cover 18 is also formed in the shape of a cap for covering the whole or a part of an upper side of a connector case 17. That is, the cover 18 is formed to have a flexibility and be able to cover the upper end part 17a of the case 17. A clearance C is provided at the part 17a of the case 17 and an inside 18a of the cover 18. The cover 18 is formed to be able to deform using the clearance C when hit by a shock to absorb the shock. The clearance C is not less than 0.5 mm to be able to decrease a stress added to a coil part not more than 1/2. COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:为了提供一种高可靠性的用于内燃机的点火线圈,其不仅具有耐热冲击性,而且优于来自外部的冲击的阻力。 解决方案:盖18由热塑性合成树脂形成。 盖18还形成为用于覆盖连接器壳体17的上侧的整体或一部分的盖的形状。也就是说,盖18形成为具有柔性并且能够覆盖上端部 在壳体17的部分17a和盖子18的内部18a处设置有间隙C.盖18形成为能够在受到冲击的情况下使用间隙C变形,以吸收 休克。 间隙C不小于0.5mm,能够将添加到线圈部的应力减小到1/2以下。 版权所有(C)2005,JPO&NCIPI
    • 54. 发明专利
    • IGNITION COIL FOR INTERNAL COMBUSTION ENGINE
    • JP2000100641A
    • 2000-04-07
    • JP27115398
    • 1998-09-25
    • HITACHI LTDHITACHI CAR ENG CO LTD
    • KONDO EIICHIROSHIMADA JUNICHIYASUKURA YOICHINAKABAYASHI KENJISAITO HIROAKI
    • H01F38/12
    • PROBLEM TO BE SOLVED: To reduce the large diameter of an ignition coil (to fulfill miniaturization), and to sufficiently fulfill insulation performance and a high output, even in an ignition coil for an internal combustion engine in an independent ignition type in an inner secondary structure type in which the restriction of an interior space is severe. SOLUTION: A center core 1, secondary coil 3 wound around a secondary bobbin 2, and primary coil 5 wound around a primary bobbin 4 are concentrically arranged in a coil case 6 in this order from the inside. One end of the secondary coil 3 is connected with the primary coil side so as to be turned into a low voltage side, and the other end is turned into a high voltage side due to an induced voltage. This ignition coil is directly connected with each ignition plug of an internal combustion engine so as to be used. The secondary bobbin 2 is made thicker at a secondary coil low voltage side 3a and a secondary coil high voltage side 3c positioned at the both edges of a secondary coil central part 3b than at the secondary coil central part 3b side. An insulating layer 8 between the secondary coil 3 and the primary coil 5 is made thin at the secondary coil low voltage side 3a and made thick at the secondary coil high voltage side 3b.
    • 55. 发明专利
    • IGNITER FOR INTERNAL COMBUSTION ENGINE
    • JPH10340822A
    • 1998-12-22
    • JP15188097
    • 1997-06-10
    • HITACHI LTD
    • YASUKURA YOICHINAKABAYASHI KENJISHIMADA JUNICHI
    • F02P15/00H01F38/12
    • PROBLEM TO BE SOLVED: To make the electrical field strength of a center core uniform and to reduce the size of the core, and then, to improve the output and insulating property of the core, by providing a positioning section which performs the centering of the secondary coil bobbin of a center core. SOLUTION: Projections 30 are provided at several locations on the inside of a secondary bobbin 3 so as to position the planar section of an inserted center core 7 with the projections 30. The space factor of the bobbin 3 is increased against the inside diameter of the bobbin 3 by forming the cross section of the core 7 in a polygon which is made closer to a circle, and the core 7 is inserted into the bobbin 3 after molding the outer periphery of the core 7 with rubber. Since the core 7 can be formed in a cylindrical state when conductive rubber is used for molding the outer periphery of the core 7, the electric field impressed upon a secondary coil becomes uniform and the insulating property of an igniter can be improved. Since the center core 7 is provided with magnets 12 for generating magnetic fluxes in the direction opposite to that of magnetic fluxes generated from a primary coil 2 and minus magnetic fluxes are given to the core 7, the magnetization curve of the core 7 can be utilized from the negative side to the positive side and the output of the coil 2 can be increased.
    • 60. 发明专利
    • METHOD AND APPARATUS FOR SENSING FIRE LOSS IN ENGINE WITH ION CURRENT SYSTEM
    • JPH04203271A
    • 1992-07-23
    • JP33218590
    • 1990-11-29
    • HITACHI LTD
    • KOUHIRA TAKASHIYASUKURA YOICHI
    • F02P17/12F02D45/00F02P17/00
    • PURPOSE:To improve a fire loss sensing performance with an ion current system by a method wherein an operation for sensing ion current is carried out for every time band when a normal combustion is assumed and an ion current is expected as a normal current flow and a judgement of the fire loss in the engine is carried out if any of these detected values is less than a reference value. CONSTITUTION:A control device 1 generates an ignition time signal 11 in response to each of outputs of a crank angle sensor 2, an air flow rate sensor 3, a throttle sensor 4, a power supply voltage sensor 5 and a water temperature sensor 6. In turn, each of ion current sensing circuits 10 is disposed between a spark plug 12 of each of cylinders and a low voltage side of a secondary coil, respectively, and the ion current sensing circuit 10 is comprised of a capacitor 13, a resistor 14 and a diode 15 or the like. In this case, a normal combustion is assumed and an ion current sensing operation is carried out at plural times in a time range for every expected time band where the ion current is normally flowed. If the detected values at plural times are less than their set values, it is judged that the engine has a fire loss in it.