Abstract: There is provided an internal-combustion-engine ignition coil apparatus in which an igniter in a connector assembly is contained in the case of the ignition coil apparatus, in which an adhesive bonds the igniter to a heat sink inserted into the case through an opening window of the case and an adhesive bonds the heat sink to the inner circumferential surface of the opening window, and in which the exposed portion of the heat sink is exposed to the outside of the case through the opening window.

Abstract: Provided is an ignition coil device for an internal combustion engine, including: an insulating case; an ignition coil device main body accommodated inside the insulating case, the ignition coil device main body including: a coil assembly; a center core arranged on an inner side of the coil assembly along a center axis of the coil assembly; a side core arranged on an outer side of the center core and the coil assembly; and an elastic cover provided to the side core; an igniter, which is accommodated inside the insulating case; and a filler, which is provided so as to fill the insulating case and is hardened, wherein the elastic cover includes: a covering portion configured to cover the side core; and a protruding portion, which protrudes from the covering portion, and is configured to relax a stress generated in the filler.

Abstract: There is provided an internal-combustion-engine ignition coil apparatus in which an igniter in a connector assembly is contained in the case of the ignition coil apparatus, in which an adhesive bonds the igniter to a heat sink inserted into the case through an opening window of the case and an adhesive bonds the heat sink to the inner circumferential surface of the opening window, and in which the exposed portion of the heat sink is exposed to the outside of the case through the opening window.

Abstract: Provided is an ignition coil device for an internal combustion engine, including: an insulating case; an ignition coil device main body accommodated inside the insulating case, the ignition coil device main body including: a coil assembly; a center core arranged on an inner side of the coil assembly along a center axis of the coil assembly; a side core arranged on an outer side of the center core and the coil assembly; and an elastic cover provided to the side core; an igniter, which is accommodated inside the insulating case; and a filler, which is provided so as to fill the insulating case and is hardened, wherein the elastic cover includes: a covering portion configured to cover the side core; and a protruding portion, which protrudes from the covering portion, and is configured to relax a stress generated in the filler.

Abstract: A magnetic path is formed of a center core disposed inside a first coil and second coil, a first side core and second side core disposed outside the first coil and second coil and coming into contact with the center core, and a magnet disposed between the first side core and second side core, wherein a shape of a space formed by a portion of contact between the first side core and second side core is a shape that forms an insertion portion of the magnet disposed obliquely with respect to the magnetic path, and voids perpendicular with respect to the magnetic path at either end portion of the magnet.

Abstract: A magnetic path is formed of a center core disposed inside a first coil and second coil, a first side core and second side core disposed outside the first coil and second coil and coming into contact with the center core, and a magnet disposed between the first side core and second side core, wherein a shape of a space formed by a portion of contact between the first side core and second side core is a shape that forms an insertion portion of the magnet disposed obliquely with respect to the magnetic path, and voids perpendicular with respect to the magnetic path at either end portion of the magnet.

Abstract: In an ignition coil device mainly mounted in an internal combustion engine, the installation can be improved even in an ignition coil having a bent leading end.

Abstract: The rotation of an ignition coil apparatus upon mounting thereof on an internal combustion engine is prevented with a simple structure, and the efficiency of mounting the ignition coil apparatus on the internal combustion engine is improved. A high voltage tower is formed integrally with a case main body having a transformer received therein, and holds a high voltage output terminal therein. A cylindrical plug boot has its one end attached to the high voltage tower. The plug boot is inserted into a plug hole in an internal combustion engine main body whereby the ignition coil apparatus is mounted on the internal combustion engine main body through a head cover having upstanding wall portions. A pair of protrusions for restricting the rotation of the casing main body around an axis of the plug hole are formed on a surface of the casing main body in opposition to the wall portions.

Abstract: The rotation of an ignition coil apparatus upon mounting thereof on an internal combustion engine is prevented with a simple structure, and the efficiency of mounting the ignition coil apparatus on the internal combustion engine is improved. A high voltage tower is formed integrally with a case main body having a transformer received therein, and holds a high voltage output terminal therein. A cylindrical plug boot has its one end attached to the high voltage tower. The plug boot is inserted into a plug hole in an internal combustion engine main body whereby the ignition coil apparatus is mounted on the internal combustion engine main body through a head cover having upstanding wall portions. A pair of protrusions for restricting the rotation of the casing main body around an axis of the plug hole are formed on a surface of the casing main body in opposition to the wall portions.

Abstract: An internal combustion engine ignition coil apparatus includes: a case; a center core disposed in the case; a primary coil and a secondary coil disposed outside the center core inside the case; a high-voltage cord having: a first end portion electrically connected to the secondary coil; and a second end portion electrically connected to a spark plug; and a protective tube covering an outer peripheral surface of the high-voltage cord, a rim portion projecting away from a high-voltage terminal being formed so as to surround an insertion aperture in a bottom portion of the case, and a leading end portion of the protective tube covering and elastically engaging with the rim portion, wherein: a receiving portion having a radially-outwardly-projecting V-shaped cross-sectional shape when sectioned axially is formed on an end portion of the rim portion.

Abstract: An ignition coil apparatus for an internal combustion engine can improve the ignition performance of the engine in an entire rotation range. The ignition coil apparatus is arranged in a plug hole formed in the engine, and includes a case (1), a center core (2) arranged on a central axis of the case (1), and a primary coil (3) and a secondary coil (4) both arranged on an outer periphery of the center core (2). Magnets (20) are arranged on the opposite end faces, respectively, of the center core (2) for applying a magnetic force thereto in a direction opposite to the direction of magnetic flux lines generated when a primary current (i1) is supplied to the primary coil (3), and the primary coil (3) has a resistance, an upper limit value of which is 1.2 ?.

Abstract: An ignition coil apparatus for an internal combustion engine can suppress an increase in the manufacturing cost of a terminal of a low-tension side connector resulting from variation in a wire diameter of an one end of a primary winding, and can ensure a stable fusing state. The positive terminal side fusing portion is composed of a planar portion and a turned portion that is inversely turned back from the planar portion to cooperate therewith to clamp a winding start conductor portion. A first bent portion of a radius of curvature R is formed at a base end portion of the turned portion. A second bent portion with its tip end tilted toward a planar portion is formed at an intermediate portion of the turned portion.

Abstract: An internal combustion engine ignition coil apparatus includes: a case; a center core disposed in the case; a primary coil and a secondary coil disposed outside the center core inside the case; a high-voltage cord having: a first end portion electrically connected to the secondary coil; and a second end portion electrically connected to a spark plug; and a protective tube covering an outer peripheral surface of the high-voltage cord, a rim portion projecting away from a high-voltage terminal being formed so as to surround an insertion aperture in a bottom portion of the case, and a leading end portion of the protective tube covering and elastically engaging with the rim portion, wherein: a receiving portion having a radially-outwardly-projecting V-shaped cross-sectional shape when sectioned axially is formed on an end portion of the rim portion.

Abstract: An ignition coil apparatus for an internal combustion engine can suppress an increase in the manufacturing cost of a terminal of a low-tension side connector resulting from variation in a wire diameter of an one end of a primary winding, and can ensure a stable fusing state. The positive terminal side fusing portion is composed of a planar portion and a turned portion that is inversely turned back from the planar portion to cooperate therewith to clamp a winding start conductor portion. A first bent portion of a radius of curvature R is formed at a base end portion of the turned portion. A second bent portion with its tip end tilted toward a planar portion is formed at an intermediate portion of the turned portion.

Abstract: A plurality of ignition coils and a plurality of switching assemblies are accommodated in one case, and a wire harness which interconnects the winding, connectors, and the switching assembly is formed as a unit using a plurality of conductors by means of a resin. In addition, respective electrical connections are established by welding, and soldering is disused. Thereby, it is provided an ignition device in which troublesome wiring between a coil and a switching assembly is eliminated and the reliability of electrical connections is improved, and which is compact and lightweight.

Abstract: An ignition circuit IG converts a battery voltage into a high spark plug discharge voltage. A resistor R1 inserted into the power supply path L detects the current flowing through the ignition circuit by converting the current into a voltage, and a level shift circuit LS shifts the potential level at both terminals of the detection resistor. A level deviation detection circuit regulates the level of a deviation voltage developed across the detection resistor, which is caused when an electric current flows from the battery to the ignition circuit, and outputs the deviation voltage. A reference voltage generation portion sets a reference voltage to be compared with the deviation voltage by a comparator COM. A clamping circuit CL suppresses variations in the power supply voltage corresponding to the level deviation detection circuit and the comparator, and protects the level deviation detection circuit.

Abstract: In an ignition apparatus for an internal combustion engine including a first cover 1A composed of an insulating material, fixed to a cylinder head and having plug holes 6, ignition coils 20A inserted into the plug holes 6 and igniting a mixed gas in cylinders and a second cover composed of an insulating material and covering the ignition coils 20A, the ignition coils 20A are fixed by means of being held between the first cover 1A and a second cover 11A. With this arrangement, the total height of the ignition apparatus can be lowered as well as the center of gravity of the apparatus is located at a low position to improve a vibration resistant property.

Abstract: An ignition apparatus for an internal combustion engine has an ignition coil 4,5 disposed within an electrically insulating case 1, and a power switch 6 disposed within the case and comprising a switching unit 8, 9 for intermittently supplying a primary current to the ignition coil. A gel 12 is disposed over the switching unit and at least one electrical wire conductor 21 having one end connected to the switching unit and the other end extending outwardly of the power switch. An electrically insulating resin 14 fills the insulating case, and supports/covers the ignition coil and the power switch. The electrical wire conductor includes a flexible bent portion 21a disposed within the gel for absorbing any tension in the conductor. With this arrangement, a heat shock resistant performance of the wire conductor is improved and working reliability is also improved.

Abstract: An ignition coil assembly for an internal combustion engine includes a primary coil, a secondary coil, at least one bobbin, a core, a first resin member and a casing. The primary coil and said secondary coil are wound on the bobbin. The core has core elements with a gap there-between through which the primary and secondary coils are magnetically coupled to one each other. The casing accommodates the primary and secondary coils, the bobbin and the core. And the first resin member covers a part of the core elements, the part which are confronted with said secondary coil, and the first resin member is accommodated in the casing.

Abstract: An ignition coil device for an internal combustion engine comprising: a plurality of iron cores; a plurality of ignition coils having a plurality of primary coils provided around said plurality of iron cores and a plurality of secondary coils magnetically-coupled with said plurality of primary coils through the plurality of iron cores; a case accommodating the plurality of iron cores and the plurality of ignition coils; and a plurality of control units accommodated in said case of which number is equal to the number of the plurality of ignition coils.