Other

Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Takahide Kosai

Noboru Sugiura

Toshiaki Ueda

Junichi Shimada

Kazutoshi Kobayashi

Yoichi Anzo

Eiichiro Kondo

Junichi c/o Hitachi Ltd Intellectual Property Group Shimada

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.

Growing community of inventors

Hitachinaka, Japan

Takahide Kosai