Ignition apparatus for use in internal combustion engine

An ignition apparatus for use in an internal combustion engine comprising

• a center core;
• a primary coil on a primary bobbin;
• a secondary coil on a secondary bobbin and arranged an inner side of said primary coil;
• an outer case;
• and
• a side core arranged on an outer periphery of said outer case;
• said primary coil and said secondary coil arranged between said center core and said outer case, whereby
• the ignition apparatus is configured to be received in a plug hole which is formed by a cylinder head and a cylinder head cover of the internal combustion engine;
• wherein
• said side core comprises at least one silicon steel sheet and has a slit between two side wall ends extending to a horizontal direction of said side core, and
• said slit is arranged to prevent a one-turn short of a magnetic flux of said side core and to obtain a predetermined secondary voltage in excess of an engine required secondary voltage, wherein
• said cylinder head and said cylinder head cover in which said ignition apparatus is configured to be used are of an aluminum material, and
• said side core is formed in a substantially pipe-like form and laminated with at least two sheets of a grain oriented silicon steel sheet, each having a thickness of 0.3-0.5 mm, said side core having a total sheet thickness of more than 0.6 mm, and each sheet having a slit between two horizontally extending side wall ends and said plural slits arranged to be aligned at substantially the same position.

An ignition apparatus for use in an internal combustion engine comprising

• a center core;
• a primary coil on a primary bobbin;
• a secondary coil on a secondary bobbin and arranged an inner side of said primary coil;
• an outer case;
• and
• a side core arranged on an outer periphery of said outer case;
• said primary coil and said secondary coil arranged between said center core and said outer case, whereby
• the ignition apparatus is configured to be received in a plug hole which is formed by a cylinder head and a cylinder head cover of the internal combustion engine;
• wherein
• said side core comprises at least one silicon steel sheet and has a slit between two side wall ends extending to a horizontal direction of said side core, and
• said slit is arranged to prevent a one-turn short of a magnetic flux of said side core and to obtain a predetermined secondary voltage in excess of an engine required secondary voltage, wherein
• the engine in which said ignition apparatus is configured to be used has said cylinder head of an aluminum material and said cylinder head cover of a thermoplastic synthetic resin material, and
• said side core is formed in a substantially pipe-like form and laminated with at least two sheets of a grain oriented silicon steel, each having a sheet thickness of 0.3-0.5 mm and said side core having a total sheet thickness of more than 0.6 mm, and each sheet having a slit between two horizontally extending side wall ends and said plural slits arranged to be aligned at substantially the same position.

An ignition apparatus for use in an internal combustion engine comprising

• a center core;
• a primary coil on a primary bobbin;
• a secondary coil on a secondary bobbin and arranged an inner side of said primary coil;
• an outer case;
• and
• a side core arranged on an outer periphery of said outer case;
• said primary coil and said secondary coil arranged between said center core and said outer case, whereby
• the ignition apparatus is configured to be received in a plug hole which is formed by a cylinder head and a cylinder head cover of the internal combustion engine;
• wherein
• said side core comprises at least one silicon steel sheet and has a slit between two side wall ends extending to a horizontal direction of said side core, and
• said slit is arranged to prevent a one-turn short of a magnetic flux of said side core and to obtain a predetermined secondary voltage in excess of an engine required secondary voltage, wherein
• an iron made plug tube is configured to be inserted under pressure in said plug hole of the internal combustion engine, and
• said side core is formed in a substantially pipe-like form and laminated with one of a single grain non-oriented steel sheet having a slit between two horizontally extending side wall ends and having a sheet thickness of 0.3-0.5 mm and a single grain oriented steel sheet having a slit between two horizontally extending side wall ends and having a sheet thickness of 0.3-0.5 mm.

An ignition apparatus for use in an internal combustion engine, comprising;

• a center core;
• a primary coil on a primary bobbin;
• a secondary coil on a secondary bobbin and arranged on an inner side of said primary coil;
• an outer case;
• and
• a side core arranged on an outer periphery of said outer case and made of a silicon steel sheet;
• said primary coil and said secondary coil arranged between said center core and said outer case, whereby
• the ignition apparatus is configured to be received in a plug hole which is formed by a cylinder head and a cylinder head cover of the internal combustion engine;
• wherein
• said side core comprises at least one silicon steel sheet and has a slit extending in a substantially longitudinal direction of said side core, and
• whereby said slit prevents a one-turn short of a magnetic flux of said side core, so as to obtain a predetermined secondary voltage in excess of an engine required secondary voltage.

An ignition apparatus for use in an internal combustion engine, comprising

• a center core;
• a primary coil on a primary bobbin;
• a secondary coil on a secondary bobbin and arranged on an inner side of said primary coil,
• an outer case;
• and
• a side core arranged on an outer periphery of said outer case and made of a silicon steel sheet;
• said primary coil and said secondary coil arranged between said center core and said outer case, whereby
• the ignition apparatus is configured to be received in a plug hole which is formed by a cylinder head and a cylinder head corer of the internal combustion engine;
• wherein
• said side core comprises at least one silicon steel sheet, and
• means is provided for preventing a one-turn short of a magnetic flux of said side core, said means comprising a substantially longitudinally extending slit in said side core.