Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Other

Hitachi Automotive Systems, Ltd.

Honda Motor Co., Ltd.

Hitachi Automotive Systems Hanshin, Ltd.

Yoichi Anzo

Noboru Sugiura

Kazutoshi Kobayashi

Junichi Shimada

Eiichiro Kondo

Takanobu Kobayashi

Makio Takahashi

Toshiaki Ueda

Hiroshi Watanabe

Takahide Kosai

Katsuaki Fukatsu

Kenji Nakabayashi

Masaru Ujigawa

Hidetoshi Oishi

Toshiaki Ishii

Nobutake Tsuyuno

Masayuki Kamikawa

Kenichi Katagishi

Gakuji Moriya

Makoto Kurahashi

Eiichiro Konda

Hayato Koguchi

Hidetoshi Oichi

Junichi c/o Hitachi Ltd Intellectual Property Group Shimada

An internal combustion engine ignition coil according to the present invention includes: a central iron core; a primary coil disposed on an outer circumference of the central iron core; a secondary coil disposed on an outer circumference of the primary coil; a side iron core disposed on an outer circumference of the secondary coil; and an insulating material sealing the central iron core, the primary coil, and the secondary coil on an inner side of the side iron core. A first layered silicate having a particle diameter less than a winding diameter of the secondary coil is present at a higher concentration in a vicinity of the secondary coil than that in a vicinity of the side iron core in the insulating material. A second layered silicate having a particle diameter greater than the winding diameter of the secondary coil is present at a higher concentration than that of the first layered silicate between the outer circumference side of the secondary coil and the side iron core. The second layered silicate has an aspect ratio of 50 or more, the aspect ratio being a ratio of a long side of a particle of the layered silicate to a thickness of the particle.

Internal combustion engine ignition coil and method for manufacturing internal combustion engine ignition coil

An object of the present invention is to provide an ignition coil for use in an internal combustion engine, offering improved water drainage performance, while achieving high waterproof performance with controlled entry of water in a plug hole. A high-voltage generating sectionthat generates a high voltage is housed inside a coil case. A plug hole sealcloses an opening in a plug holein which an ignition plugis mounted. The ignition coil further includes a space portionplaced on an outer side portion of the high-voltage generating sectionand an air pathfor venting air between the space portionand the plug hole. The space portionhas an open lower surface (an entirely open surface facilitates demolding).

Ignition coil for internal combustion engine

An auxiliary core portion and a main core portion, including a magnet if the magnet is attached, are covered by a resin film or an elastomer film and fixed as a single assembly. In this state, a coil is attached to the assembly and a side core portion is assembled to the assembly. The auxiliary core portion and the main core portion, including the magnet if it is attached, can be supplied, as the single assembly, to an automated assembly line for ignition coils. It is not necessary to position such components on the assembly line. Thus, the workability of the automated assembly can be enhanced.

An internal combustion engine ignition coil device has an annular seal rubber at its lower side coil. An annular projection is provided on a part of the seal rubber and is pressed against the inner diameter surface of a plug hole. An air path is formed in part of a coil case by mounting the seal rubber into a groove, enabling inside and outside portions of the plug hole to communicate. A gas-permeable thin film resin member is bonded to an inlet of the air path.

Ignition coil device for internal combustion engine

A long and narrow shape independent ignition type ignition apparatus has a long and narrow shape center core for an internal combustion engine. At least one of magnet member and a rubber material member is arranged at an end portion of the center core. A circumference of the center core including said magnet member and said rubber material member is surrounded using a soft material member.

Ignition coil for use in engine and engine having plastic cylinder head cover

To improve an anti-heat shock performance and an electric field concentration relaxation (an insulation performance) between a secondary coil and a center core, to attain a narrow diameter structure in an individual ignition type ignition coil and further to improve an assembling working of the ignition coil. The individual ignition type ignition coil is adopted to an engine having a plastic head cover. A secondary coilis positioned at an inner side of a primary coiland between a secondary bobbinand a center corea soft epoxy resinis filled up. In the secondary bobbin, a secondary coil low voltage side is a potting side of the soft epoxy resinand an inclination having a difference in an inner diameter is provided on the inner diameter in which the secondary coil low voltage side is formed large and secondary coil high voltage side is formed small. In the secondary bobbin, a thickness in the secondary coil low voltage side is formed thin and a thickness in the secondary coil high voltage side is formed thick. The soft epoxy resinhas a dent' according to a compression molding and has a glass transition point Tg which satisfies a condition of [an allowable stress of the secondary bobbin &#x3e; a generation stress at (from &#x2212;40&#xb0; C. to a glass transition point of an insulation resin)]. The secondary bobbin is formed by PPS and the primary bobbin is set to the primary coil at outer side of the secondary assembling body and under an assembling condition the winding is carried out.

An individual ignition type ignition coil is adopted to an engine having a plastic head cover. A secondary coil is positioned at an inner side of a primary coil and between a secondary bobbin and a center core a soft epoxy resin is filled up. The soft epoxy resin hash a dent according t a compression molding and has a glass transition point Tg which satisfies a specified condition. The secondary bobbin is formed by PPS and the primary bobbin is set to the primary coli at outer side of the secondary assembling body and under an assembling condition the winding is carried out.

To improve an anti-heat shock performance and an electric field concentration relaxation (an insulation performance) between a secondary coil and a center core, to attain a narrow diameter structure in an individual ignition type ignition coil and further to improve an assembling working of the ignition coil. The individual ignition type ignition coil is adopted to an engine having a plastic head cover. A secondary coil,is positioned at an inner side of a primary coil,and between a secondary bobbin,and a center core,a soft epoxy resin,is filled up. In the secondary bobbin,, a secondary coil low voltage side is a potting side of the soft epoxy resin,and an inclination having a difference in an inner diameter is provided on the inner diameter in which the secondary coil low voltage side is formed large and secondary coil high voltage side is formed small. In the secondary bobbin, a thickness in the secondary coil low voltage side is formed thin and a thickness in the secondary coil high voltage side is formed thick. The soft epoxy resin,has a dent,&prime; according to a compression molding and has a glass transition point Tg which satisfies a condition of &lsqb;an allowable stress of the secondary bobbin<a generation stress at (from &minus;40&deg; C. to a glass transition point of an insulation resin)&rsqb;. The secondary bobbin is formed by PPS and the primary bobbin is set to the primary coil at outer side of the secondary assembling body and under an assembling condition the winding is carried out.

Ignition coil unit for engine and engine provided with plastic head cover

An ignition apparatus is received in a plug hole which is formed by a cylinder head and a cylinder head cover of an internal combustion engine. A side core has a slit between two horizontally extending side wall ends. The side core is selected from a laminated sheet structure comprised of two grain oriented silicon steel sheets, each having a slit between two horizontally extending side wall ends, and the plural slits align at substantially the same position. The slit prevents a one-turn short of a magnetic flux of the side core. Thereby a predetermined secondary voltage more than an engine requirement secondary voltage is obtained. An ignitor reception portion has an independent and individual ignitor reception portion and an independent and individual coil reception portion, with the ignitor reception portion and the coil reception portion being combined.

Ignition apparatus for use in internal combustion engine

In order to reduce the bulk and weight of the upper igniter case division of the armor case, and to lower the center of gravity of the total apparatus so as to provide an igniter which is tough to oscillate, the igniter for the internal combustion engine has the armor case equipped with the coil department and igniter unit therein, and said armor case has the igniter case having the coil department case and the connector department. Furthermore, the coil department case is inserted in the plug hole of the internal combustion engine. The igniter unit is mounted in the igniter case. Furthermore, the igniter unit has a semiconductor device of a simple substance silicon chip having integrated therein a semi-conductor for switching and a current limiting circuitry. The semi-conductor for switching consists of an insulated bipolar transistor (IGBT) or a power transistor.

Igniter for internal combustion engine having outer packing case

In order to reduce the bulk and weight of the upper igniter case division of an armor case, and to lower the center of gravity of the total apparatus so as to provide an igniter which is tough to oscillate, the igniter for the internal combustion engine has the armor case equipped with a coil compartment and igniter unit. The armor case has the igniter case having the coil case and connector. Furthermore, the coil compartment case is inserted in the plug hole of the internal combustion engine. The igniter unit is mounted in the igniter case. Furthermore, the igniter unit has a semiconductor device of a single substance silicon chip having integrated therein a semi-conductor for switching and a current limiting circuitry. The semi-conductor for switching consists of an insulated bipolar transistor (IGBT) or a power transistor.

A cylindrical type ignition apparatus housed in a spark plug hole of a cylinder of an internal combustion engine is disclosed. A center core, a primary coil, a secondary core and a side core are provided, and a closed magnetic path is formed by connecting magnetically the center core and the side core by a core on a high voltage side and a core on a low voltage side, or a semi-closed magnetic path is formed by connecting magnetically the center core and the side core by a core on a low voltage side.

Ignition apparatus for an internal combustion engine

An ignition device for an internal-combustion engine, in which a pocket section is provided in a case for holding primary and secondary coils, and an ignition module is built in the pocket section. In the ignition module a relay member is secured on a heat sink, a connecting terminal electrically connected to an internal terminal is installed to the relay member, and the connecting terminal and a hybrid IC substrate are electrically connected by an aluminum wire.

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Hitachinaka, Japan

Yoichi Anzo