Ignition coil for internal combustion engine
AssigneeDenso Corporation
InventorsYosimi Nakase, Shigemi Itou, Masahiro Kondou
Life of this patent
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Abstract
A conductive member is disposed between a secondary spool and a high tension terminal to shield the wire connecting the secondary coil and the high tension terminal. The conductive member has a wide surface facing the low tension components to moderate the electric field strength around low tension components, thereby preventing treeings from growing in the insulating filler of the ignition coil.
Claims12
An ignition coil for an internal combustion engine comprising low tension components including a low tension primary coil, and high tension components including a high tension secondary coil, a high tension terminal, a connecting member for connecting said high tension secondary coil and said high tension terminal, and a control circuit connected to said primary coil for generating a high tension potential at said high tension secondary coil by intermittently supplying current to said low tension primary coil, said ignition coil comprising:
- a conductive member, extending axially and circumferentially between said high tension secondary coil and said high tension terminal to have said a high tension potential, thereby providing a conductive surface area to moderate electric field strength around said connecting member, said conductive member being provided substantially from an end of said high tension coil to said high tension terminal.
A ignition coil for an internal combustion engine comprising:
- a housing to be disposed at a spark plug;
- a columnar core;
- a secondary spool disposed around said columnar core;
- a secondary coil wound around said secondary spool;
- a primary spool disposed around said secondary spool;
- a primary coil wound around said primary spool;
- a control circuit connected to said primary coil for generating a high tension potential at said secondary coil by intermittently supplying current to said primary coil;
- a high tension terminal disposed axially distant from an end of said columnar core and connected to said secondary coil;
- and
- an insulating resinous filler having a dielectric constant different from said primary spool disposed in said housing, wherein
- said primary spool comprises a shielding portion projecting axially from an end of said secondary spool to cover said high tension terminal immersed in said insulating resinous filler, and said primary coil is not wound on said shielding portion of said primary spool.
An ignition coil for an internal combustion engine comprising:
- a casing disposed at a spark plug;
- a columnar core;
- a secondary spool disposed around said columnar core;
- a secondary coil wound around said secondary spool;
- a primary spool disposed around said secondary spool;
- a primary coil wound around said primary spool;
- an auxiliary core disposed around said primary coil;
- a control circuit connected to said primary and secondary coils for generating a high tension potential at said high tension secondary coil by intermittently supplying current to said low tension primary coil;
- a high tension terminal disposed axially distant from an end of said columnar core and connected to said secondary coil;
- and
- an insulating filler having a dielectric constant different from said primary spool disposed in said casing;
- wherein
- said primary spool comprises a shielding portion projecting longitudinally from a straight line between an end of an outer periphery of said high tension terminal immersed in said insulating filler and an end of an inner periphery of said auxiliary core and said primary coil is not wound on said portion of said primary spool.
An ignition coil for an internal combustion engine comprising:
- a casing to be disposed at a spark plug;
- a transformer section disposed in said casino, said section having a longitudinally extending low tension primary coil wound on a primary spool and longitudinally extending high tension secondary coil wound on a secondary spool;
- a control circuit connected to said primary and secondary coils for generating a high tension potential at said high tension secondary coil by intermittently supplying current to said low tension primary coil;
- a high tension terminal disposed in said casing;
- a connecting member, disposed in said casing, for connecting said high tension secondary coil to said high tension terminal;
- and
- a conductive member, extending longitudinally and circumferentially between said high tension secondary coil and said high tension terminal to provide a conductive surface having said high tension potential, for moderating electric field strength around said connecting member, said conductive member being extended substantially from an end of said secondary coil to said high tension terminal.
Dependencies are inferred from the claim text.