US 6,208,231 B1Granted

Stick-type ignition coil having improved structure against crack or dielectric discharge

AssigneeDenso Corporation

InventorsKazutoyo Oosuka, Keisuke Kawano, Hiroyuki Wakabayashi, Akimitsu Sugiura, Tomonori Ishikawa, Naruhiko Inayosi, Masahiko Aoyama, Kazuhide Kawai, Norihiro Adachi, Yoshimi Nakase, Yoshitaka Sato, Tomonari Chiba, Katsuhisa Kato

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Abstract

A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.

Claims19

Dependent claims

An ignition coil for an engine comprising:

a coil assembly including the following components:
a central core assembly;
a primary spool;
a primary coil wound around the primary spool;
a secondary spool;
a secondary coil wound around the secondary spool;
and
an outer core;
said central core assembly, said secondary spool, the secondary coil, said primary spool and said primary coil being received in said outer core member and said components of said coil assembly being concentrically disposed;
a resin insulator filled around the components of the coil assembly that are within said outer core;
and further comprising:
a separating member interposed between two of said components of said coil assembly, said separating member having a low adhesion with so as to be displaceable relative to said resin insulator so that at least one of 1) an inner peripheral part comprised of components of said coil assembly on a radially inner side of said separating member and 2) an outer peripheral part comprised of the components of said coil assembly on a radially outer side of said separating member is movable relative to said separating member, whereby said inner peripheral part and said outer peripheral part expand and contract separately from each other.

9 more elements

Dependencies are inferred from the claim text.