Abstract: An electrical interface assembly is provided for an ignition system including at least one ignition coil per cylinder in a multi-cylinder engine. Each ignition coil includes a plurality of coil terminals for passing respective electrical signals. One of the electrical signals may be used for discharging a respective spark in a respective cylinder. The interface assembly comprises a respective miniaturized printed circuit board (PCB) on each ignition coil. Each miniaturized PCB is electrically coupled to the coil terminals therein. The interface assembly further comprises a separate electrically conductive structure for electrically interconnecting each miniaturized PCB. The electrically conductive structure may be configured to reduce ohmic losses due to inter-cylinder separation in the electrical signal used for discharging the respective spark.

Abstract: An independent ignition type ignition coil for an internal combustion engine, comprising, arranged concentrically in a coil case (6) and with the innermost one mentioned first, a center core (1), a secondary coil (3) wound on a secondary bobbin (2) and a primary coil (5) wound on a primary bobbin (4), with epoxy resin (8) and soft epoxy (17) filled between these component members, wherein a coating is formed on the outer surface of the primary coil (5) so as to facilitate the separation from the epoxy resin (8) and the presence of this separation portion (50) between the primary coil (5) and the resin and in an interlayer of the primary coil (5) can reduce from a thermal stress produced within the secondary bobbin (2) a stress which is produced in the secondary bobbin by a heat contraction difference between the primary coil (5) and the secondary bobbin, thereby reducing the thermal stress of the secondary bobbin of the independent type ignition coil exposed to a rigorous temperature environment to prevent bo

Abstract: Internal combustion engine (ICE) on-plug ignition coils with transistor drivers located in powertrain control modules (PCM) or other remote locations are prone to high electrical and magnetic interference (EMI) emissions and are subject to interference from other components due to long connecting wires. Ionization detection circuits have even greater sensitivity to EMI because of their very low signal current levels (microampere). The present feature of the invention integrates both the coil driver transistor and ionization detection circuits into the on-plug ignition coil. In a preferred embodiment, parts rated at 140 degrees centigrade are used in both the coil driver transistor and the ionization circuits which are located on the coil to address temperature and thermal shock concerns. Additionally, parts rated at 20 G are used in both the coil driver transistor and the ionization circuits to address vibration concerns.

Abstract: An ignition apparatus includes a high voltage (HV) terminal formed of stamped sheet metal configured to be disposed in a secondary winding spool, and to which a high voltage end of the secondary winding is attached and soldered. The ignition apparatus further includes an electrically conductive cup configured to surround the high voltage terminal when the secondary winding spool is inserted in the case. The high voltage terminal has one end that comes into engagement with an inner annular surface of the cup. The cup includes an annular sidewall that extends axially up to a winding flange where a HV end of the secondary winding exits a winding bay thereby surrunding the exiting HV secondary winding wire. The cup provides for a reduced electric field concentration.

Abstract: 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 rein is filled The soft epoxy resin has a dent according to a compression molding and has a glass transition point Tg which satisfies a specified condition. The secondary bobbin is formed by PTS and the primary bobbin is set to the primary coil at the outer side of the secondary assembling body, and under an assembling condition the winding is carried out.

Abstract: An ignition coil has a case and a central core placed in the case. A secondary spool is wound with a secondary coil and placed outside the central core in the case. A cylindrical primary spool is wound with a primary coil and placed outside the secondary spool in the case. A resin insulator is filled in the case to maintain the insulation between each member. Air layer is partitioned in at least one of a gap between the central core and the secondary spool and a gap between the primary spool and the case.

Abstract: An operation of connecting primary coils and a wiring module of an ignition apparatus for an internal combustion engine is carried out smoothly. The ignition apparatus includes a casing (8), closed magnetic circuit cores (2), primary coils (4) each having primary coil connector terminals (40a, 40b) at their opposite ends, respectively, and secondary coils (6) having secondary coil connector terminals (6a). A wiring module (9) is composed of a plurality of wires integrally formed with each other through a resin for supplying current to the primary coils (4). A resin portion (11) is filled into the casing (8) to fixedly attach transformers (1A, 1B, 1C) to the casing (8). A positioning element (9c, 40c) is arranged between the primary coils (4) and the wiring module (9) to position the relative positions of the primary coil connector terminals (40a, 40b) and module connector terminals (10a, 10c).

Abstract: In an ignition device for use in an internal combustion engine in which a spark plug and an ignition coil are integrated with each other and mounted in a cylinder head, a case is made of an electrical conductive material and one end portion of a secondary winding of the ignition coil is electrically connected to a center electrode of the spark plug while the other end portion of the secondary winding and an earth electrode of the spark plug are electrically connected to the case. Thus, the low-voltage side of the secondary winding and the earth electrode are electrically connected to each other through the case. This eliminates the need for a connector terminal and a wire harness for the electrical connection of the low-voltage side of the secondary winding to the internal combustion engine.

Abstract: In an ignition device for an internal combustion engine, comprising a spark plug made to carry out an electric discharge between an center electrode and an earth electrode and an ignition coil having a primary winding and a secondary winding for supplying a high voltage to the spark plug, notch portions are made in a ceramic spool on which one of the primary and secondary windings is wound and projecting portion are made in an insulating-resin-made holding member into which connector terminals are incorporated, with the projecting portions being engaged with the notch portions. The engagement of the projecting portions and the notch portions prevents the connector terminals from moving with respect to the ceramic spool in circumferential directions of the ceramic spool during terminal connection work.

Abstract: An ignition device for an internal combustion engine has a housing, which includes a first case adjacent to the combustion chamber of the engine and a second case away from the combustion chamber. The first case has a flange formed at its end away from the combustion chamber. The second case has a flange formed at its end adjacent to the combustion chamber. The first case flange faces the side of the second case flange that is away from the combustion chamber. A bolt is screwed into the second case to engage the flanges with each other, substantially integrating the cases with each other.

Abstract: An ignition apparatus includes a high resistivity ferrite central core with a secondary winding disposed directly thereon. The ignition apparatus also includes, in a progressively coaxial fashion, a primary spool, a primary winding disposed on the spool, a case, and an outer core or shield of magnetically permeable material. The ignition apparatus exhibits reduced capacitance, and eliminates radial partial discharge at the inside diameter of the secondary winding.

Abstract: In an ignition coil assembly, a plurality of ignition coils is arranged to be electrically connected to spark plugs received in plug holes of an engine. A base cover supports the ignition coils at corresponding positions, which correspond to positions of the plug holes, respectively. A top cover covers a top surface of the base cover. Connecting bolts connects between the top cover and the base cover. Fastening bolts secures only the base cover to the engine.

Abstract: An insulator includes a coil side cylindrical portion extending from a plug side cylinder portion in a direction departing from a combustion chamber. One end of the coil side cylindrical portion protrudes in the direction departing from the combustion chamber with respect to a primary winding and a secondary winding. A pressure sensing element is disposed next to the one end of the coil side cylindrical portion. The signal lines of the pressure sensing element are taken out of a casing without passing aside an ignition coil. Thus, the diameter of the casing does not increase. The output signal of the pressure sensing element is not adversely influenced by discharge noises generated from the ignition coil.

Abstract: An ignition coil, spark plug, and pressure sensor for an internal combustion engine are, in a preferred embodiment, integrated into a single assembly and mounted directly on a plug hole of an internal combustion engine. A hard spark plug shell serves as a pressure member and on which a strain gage is affixed. Changes in the pressure in the combustion chamber deform the shell, causing a corresponding change in the resistance of the strain gage. A bridge circuit or the like is used to measure the resistance change thereby providing a direct indication of cylinder pressure.

Abstract: An ignition coil assembly of the type which is directly mounted onto an associated internal combustion engine spark plug. The coil assembly includes a spark plug boot section made of a highly elastic material with an inside cylindrical passageway. The inside passageway features ribs which engage a high voltage connection coil spring positioned in the passageway to make an electrical connection between the coil and spark plug high voltage terminals. The spring has a generally constant outside diameter outer section except its end segments have a reduced diameter where they contact the high voltage terminals. The passageway ribs retain the spring in position prior to its installation and after its removal from the associated spark plug.

Abstract: In an ignition coil assembly, a plurality of ignition coils is arranged to be electrically connected to spark plugs received in plug holes of an engine. A base cover supports the ignition coils at corresponding positions, which correspond to positions of the plug holes, respectively. A top cover covers a top surface of the base cover. Connecting bolts connects between the top cover and the base cover. Fastening bolts secures only the base cover to the engine.

Abstract: An ignition apparatus for an internal combustion engine can increase the degree of freedom of wiring paths of electroconductive wires as well as simplifying and miniaturizing a wiring module. Transformers (5A, 5B, 5C) are built into a casing (4) and each includes a core (6), a primary coil (8) and a secondary coil (10) arranged to surround the core for generating a high voltage in the secondary coil (10). A wiring module (20) built into the casing electrically connects the transformers and the switching module with one another. An insulating resin portion (11) fixedly attaches the transformers, the switching module and the wiring module to the casing. The wiring module (20) includes a module main body (22), which is formed by integrating a plurality of conductors (13, 14, 15) with one another through a resin, and flexible electroconductive wires (21) disposed along a surface of the module main body (22).

Abstract: An operation of connecting primary coils and a wiring module of an ignition apparatus for an internal combustion engine is carried out smoothly. The ignition apparatus includes a casing (8), closed magnetic circuit cores (2), primary coils (4) each having primary coil connector terminals (40a, 40b) at their opposite ends, respectively, and secondary coils (6) having secondary coil connector terminals (6a). A wiring module (9) is composed of a plurality of wires integrally formed with each other through a resin for supplying current to the primary coils (4). A resin portion (11) is filled into the casing (8) to fixedly attach transformers (1A, 1B, 1C) to the casing (8). A positioning element (9c, 40c) is arranged between the primary coils (4) and the wiring module (9) to position the relative positions of the primary coil connector terminals (40a, 40b) and module connector terminals (10a, 10c).

Abstract: An ignition coil according to the invention is an ignition coil having a case and a coil portion accommodated in the case. The case comprises a base resin whose dielectric breakdown voltage exceeds that of polyphenylene sulfide and whose spiral flow length exceeds that of polybutyrene terphthalate. As the base resin has a high fluidity, there is only a limited risk that a defect such as a weld line is caused when molding a thin case. In addition, while the thickness of the case and the electrical insulation properties are in proportion to each other, the case comprising the base resin can ensure sufficient electrical insulation properties even if the case is formed thin.

Abstract: An ignition coil unit to be installed in a hole opened through a cylinder head of an engine having a case, an ignition coil installed in the case and comprising a primary coil connected to a power source and a secondary coil connected to a spark plug which is installed in a combustion chamber of a cylinder of the engine for producing spark discharge to ignite air-fuel mixture to generate combustion thereof in the combustion chamber, and a circuit board on which an ionic-current detection circuit, connected to the secondary coil, which detects ionic-current that flows during the combustion of the air-fuel mixture; and a processing circuit, connected to the ionic-current detection circuit, which generates an output indicative of the detected ionic-current, are formed; In the unit, an igniter is also installed in the case, thereby improving detection accuracy of ionic-current and misfiring.

Abstract: In an ignition coil assembly, a plurality of ignition coils is arranged to be electrically connected to spark plugs received in plug holes of an engine, and a base member detachably engages and holds the ignition coils at corresponding positions, which correspond to positions of the plug holes. Disengaging force for disengaging each ignition coil and the base member from each other is set to be smaller than disengaging force for disengaging each ignition coil and the corresponding one of the spark plugs from each other.

Abstract: An ignition apparatus for an internal combustion engine can be reduced in size and cost. A plurality of closed magnetic circuit cores (2) are built in a casing (8) and each have an excitation portion (2a) and non-excitation portions (2b). A plurality of coil parts (100) each includes a primary coil (4) and a secondary coil (6) which are arranged to surround the excitation parts (2a) of a corresponding one of the closed magnetic cores (2). The closed magnetic circuit cores (2) are arranged along an axial direction (A) of the coil parts (100) such that adjacent ones of the non-excitation portions (2b), which are those sides of adjacent cores (2) each of which extends from one end of a corresponding excitation portion (2a), overlap each other at least partially in the axial direction (A).

Abstract: In an ignition coil assembly, a plurality of ignition coils is arranged to be electrically connected to spark plugs received in plug holes of an engine, and a base member detachably engages and holds the ignition coils at corresponding positions, which correspond to positions of the plug holes. Disengaging force for disengaging each ignition coil and the base member from each other is set to be smaller than disengaging force for disengaging each ignition coil and the corresponding one of the spark plugs from each other.

Abstract: In an individual ignition type ignition coil for use in an internal combustion engine in which a center core 1, a secondary coil 3 wound on a secondary bobbin 2 and a secondary coil 5 wound on a primary bobbin 4 are installed concentrically from an inner side of a coil case 6 in order. Among these interior constituting members, insulation resins 17 and 8 are filled up. Each of the primary bobbin 4 and the secondary bobbin 2 is made of a synthetic resin and at least a skin layer on an inner surface of the primary bobbin 4 and a skin layer on an outer surface of the secondary bobbin 2 are removed, and to the surfaces of the bobbins, the insulation resin 8 is adhered closely. By heightening a close adhesion strength (a bonding strength) of a bobbin and an insulation resin in an individual ignition type ignition coil, an anti-heat shock is improved and an insulation performance of the coil is attained.

Abstract: An ignition coil for a motor vehicle, comprising: a magnetic core (12) having an elongated shape, a primary spool (20) supporting a low-voltage winding (22), and a secondary spool (16) supporting a high-voltage winding (18). The two spools are set coaxially with respect to the magnetic core. The coil includes a tubular shaped outer casing (24) carrying, at a first end, a low-voltage connector (28) and, at a second end, a high-voltage connector (30) which is designed to connect with a spark plug. A diode (42) is set at one end of the high-voltage spool (16) and has both a first rheophore (44), which is electrically connected to one end of the high-voltage winding (18), and a second rheophore (46), which is electrically connected to the high-voltage connector (30).

Abstract: An external connection terminal connector as a separate part that mounts the igniter is abolished, and the external connection terminal is integrated with the igniter itself. The igniter has the electronic components mounted on an internal wiring substrate, and the electronic components within the igniter and the external connection terminal are directly connected by wire bonding.

Abstract: In an ignition device for an internal combustion engine, comprising a spark plug made to carry out an electric discharge between an center electrode and an earth electrode and an ignition coil having a primary winding and a secondary winding for supplying a high voltage to the spark plug, notch portions are made in a ceramic spool on which one of the primary and secondary windings is wound and projecting portion are made in an insulating-resin-made holding member into which connector terminals are incorporated, with the projecting portions being engaged with the notch portions. The engagement of the projecting portions and the notch portions prevents the connector terminals from moving with respect to the ceramic spool in circumferential directions of the ceramic spool during terminal connection work.

Abstract: An insulator includes a coil side cylindrical portion extending from a plug side cylinder portion in a direction departing from a combustion chamber. One end of the coil side cylindrical portion protrudes in the direction departing from the combustion chamber with respect to a primary winding and a secondary winding. A pressure sensing element is disposed next to the one end of the coil side cylindrical portion. The signal lines of the pressure sensing element are taken out of a casing without passing aside an ignition coil. Thus, the diameter of the casing does not increase. The output signal of the pressure sensing element is not adversely influenced by discharge noises generated from the ignition coil.

Abstract: In an ignition device for use in an internal combustion engine in which a spark plug and an ignition coil are integrated with each other and mounted in a cylinder head, a case is made of an electrical conductive material and one end portion of a secondary winding of the ignition coil is electrically connected to a center electrode of the spark plug while the other end portion of the secondary winding and an earth electrode of the spark plug are electrically connected to the case. Thus, the low-voltage side of the secondary winding and the earth electrode are electrically connected to each other through the case. This eliminates the need for a connector terminal and a wire harness for the electrical connection of the low-voltage side of the secondary winding to the internal combustion engine.

Abstract: An insulator includes a plug side cylindrical portion having an inner space for accommodating a center electrode and a coil side cylindrical portion extending in a direction departing from a combustion chamber. The high-voltage portion of an ignition coil is entirely accommodated inside the coil side cylindrical portion. According to this arrangement, the coil side cylindrical portion can assure insulation between the high-voltage portion and the low-voltage portion. The portion to be insulated and fixed by an insulating resin is limited only to the secondary winding.

Abstract: An ignition coil includes a center core, a primary coil a secondary coil, a coil housing, a tower housing disposed under the coil housing, and a high tension terminal disposed inside the tower housing. The high tension terminal has an upper flange disposed at a first circumferential gap opposite the inside surface of the tower housing and a middle barrel disposed at a second circumferential gap opposite the inside surface of the coil housing. The first circumferential gap is made smaller than the second circumferential gap. The tower housing or the upper flange has a void-purging passage for purging air from the insulation resinous members when filled in the coil housing.

Abstract: A method of assembling an ignition coil cassette assembly for use with an internal combustion engine having a plurality of cylinder assemblies each including a spark plug, and an ignition coil cassette assembly provided in accordance with the invention methodology. The cassette assembly includes a plurality of ignition coils for respective electrical coupling to the respective spark plugs, whereby to deliver high voltage charges to the spark plugs in accordance with a predetermined firing order, a cassette body structure interconnecting and mounting the ignition coils in spaced downstanding relation with respect to the body, a printed circuit board for delivering power to the coils, and electronic components mounted on the board.

Abstract: An apparatus for combustion initiation in an internal combustion engine is provided. A capacitive spark plug boot uses the engine cylinder head as an outer capacitor member. The capacitive spark plug boot contains a transformer, an inner capacitor member and an insulator. The insulator surrounds the inner capacitor member, with an outer surface of the insulator sized to engage a cylinder head cavity surrounding the spark plug. The capacitor stores electrical energy received from the transformer, and delivers it to the spark plug upon formation of a spark.

Abstract: A retaining apparatus for mounting a component in an aperture formed in a mounting surface includes an elongated base member having opposite ends. At least two generally parallel side members each extend from an associated one of said base member ends. Each side member includes a free end. A component having a flange with at least two slots formed therein receives an associated side member in each of the slots. A locking means extends from said side members adjacent said free ends. As the component is inserted in the mounting surface aperture, force is applied to move the free ends of the side members toward each other to permit the locking means to pass through the aperture in the mounting surface. When the force is removed, the locking means and the flange engage opposite sides of the mounting surface to releasably retain the component in the aperture.

Abstract: An ignition system for igniting fuel in a gas turbine or diesel engine is described. The system includes a magnetic core-coil assembly having a magnetic core comprising at least one tape wound toroid of ferromagnetic amorphous metal alloy, a primary winding and a secondary winding. Also included are driver electronics for applying voltage to a spark plug to cause a spark to ignite the fuel. The core-coil assembly and driver electronics are capable of operating with a rapid charge and discharge cycle to produce a high spark pulse rate. In another aspect, a magnetic core-coil assembly is disclosed which has a magnetic core comprising at least one tape wound toroid of ferromagnetic amorphous metal alloy having a permeability ranging from about 250 to 500, a primary winding for low voltage excitation and a secondary winding for high voltage output.

Abstract: In an ignition coil having an outer coil unit, an inner coil unit, a coil case in which the outer and inner coil units are housed and a tower case accommodating lower parts of outer and inner spools, the outer spool is made of resin material whose bonding strength to resin insulating material, with which the tower case is filled, is weak and an axial leading end of the outer spool is positioned axially away from a reference position by a distance equal to or shorter than 60% of a reference length or by a distance equal to or longer than 90% of the reference length. With this ignition coil, cracks hardly occur on the resin insulating material opposed to the axial leading end of the outer spool by thermal stress.

Abstract: An ignition coil includes a center core, a primary coil a secondary coil, a coil housing, a tower housing disposed under the coil housing, and a high tension terminal disposed inside the tower housing. The high tension terminal has an upper flange disposed at a first circumferential gap opposite the inside surface of the tower housing and a middle barrel disposed at a second circumnferential gap opposite the inside surface of the coil housing. The first circumferential gap is made smaller than the second circumferential gap. The tower housing or the upper flange has a void-purging passage for purging air from the insulation resinous members when filled in the coil housing.

Abstract: The present invention comprises an Electronics Control Unit (ECU) power potential stabilizing circuit and an ECU reference potential stabilizing circuit. The ECU power potential stabilizing circuit eliminates noise and stabilizes voltage variation occurring when the electrical parts of automobile are activated by the power supplied through the ECU of the electronic accelerator, by impressing it to the power supply line and variable voltage supply line. The ECU reference potential stabilizing circuit eliminates the unnecessary spark noise and harmonics noise occurring on the power supply line, reference potential line and variable voltage supply line, by impressing it to the variable voltage supply line and reference potential line. It further stabilizes the voltage supplied to the ECU by compensating the voltage fluctuated due to disturbances.

Abstract: A retaining apparatus for mounting a component in an aperture formed in a mounting surface includes an elongated base member having opposite ends. At least two generally parallel side members each extend from an associated one of said base member ends. Each side member includes a free end. A component having a flange with at least two slots formed therein receives an associated side member in each of the slots. A locking means extends from said side members adjacent said free ends. As the component is inserted in the mounting surface aperture, force is applied to move the free ends of the side members toward each other to permit the locking means to pass through the aperture in the mounting surface. When the force is removed, The locking means and the flange engage opposite sides of the mounting surface to releasably retain the component in the aperture.

Abstract: 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.

Abstract: An ignition system for an internal combustion engine is designed so that it can be inexpensively produced in a manner advantageous from a standpoint of production engineering. The ignition system includes a shaft in a cylinder head of an internal combustion engine and a coil rod, which can be inserted over a portion of its longitudinal extension into the shaft. The coil rod forms an open magnetic circuit which is controlled by a tubular, longitudinally slit return plate. This return plate is set apart from the coil rod, in the shaft of the cylinder head. The ignition system is intended to be used in the automobile industry.

Abstract: An AC ignition system for an internal combustion engine having a voltage source, an ignition coil coupled to the voltage source and at least one spark plug having a spark gap, the ignition coil has a primary winding and a secondary winding, the secondary winding has a high turn ratio with respect to the primary winding. The primary winding is electrically coupled to the voltage source and the secondary winding is electrically connected to the spark gap. A switch is connected in series with the primary winding and is configured for movement between an open position and a closed position the closed position electrically couples the voltage source to the primary winding. The ignition coil generates a make voltage after the primary winding is coupled to the voltage source. The make voltage is sufficient to ionize the spark gap.

Abstract: In order to prevent a crack of plastic parts caused by a shrinkage force of a resin filler filled in an ignition coil casing, a cylindrical coil casing houses a primary coil and a secondary coil concentrically, and the resin filler such as epoxy resin is filled in the coil casing to insulate between the parts in the coil casing and to fix the parts. A ring-shaped partition member is provided at the upper portion in the coil casing to separate the resin filler locating above the primary coil and the secondary coil inside and outside. The partition member is made of a resin whose adhesive strength against the resin filler is weak, such as polypropylene (PP). The partition member reduces the shrinkage force between the outside resin filler and the inside resin filler, and prevents a crack of plastic parts, such as the secondary spool.

Abstract: An ignition coil assembly includes a core formed of magnetically-permeable material extending along a main axis, a primary winding disposed about the core, a secondary winding disposed on a secondary winding spool wherein at least one of the secondary winding leads is connected to a high-voltage connector terminal portion of the ignition coil assembly configured for connection to a remotely disposed spark plug, a case formed of electrical insulating material, and a magnetically-permeable shield disposed outwardly of the case. The secondary winding is progressively wound on the secondary winding spool, thereby eliminating failure modes associated with the segment-wound secondary windings, and, eliminating the need for pole pieces in the magnetic circuit, thereby reducing components, cost, weight, and size of the ignition coil assembly.

Abstract: An ignition apparatus includes a high resistivity ferrite central core with a secondary winding disposed directly thereon. The ignition apparatus also includes, in a progressively coaxial fashion, a primary spool, a primary winding disposed on the spool, a case, and an outer core or shield of magnetically permeable material. The ignition apparatus exhibits reduced capacitance, and eliminates radial partial discharge at the inside diameter of the secondary winding.

Abstract: A “pencil” ignition coil includes a seal member having features that cooperate with complementary features provided on the engine cam cover/spark plug well into which the coil is inserted to provide a retention and tactile feel insertion feature. In particular, the cooperating features are configured to longitudinally align and position the ignition coil in the spark plug well in a predetermined relationship. In one embodiment, the seal member includes a circumferentially-extending rib on an outside diameter thereof, while the cam cover/spark plug well includes an undercut groove portion on an inside diameter portion thereof. The rib has an increased diameter relative to the surrounding, outside diameter surface of the seal member, while the undercut groove portion has an increased diameter relative to the surrounding land portions.

Abstract: An ignition unit for at least two sparkplugs of an internal combustion engine, the unit being in the form of a box having therein a reception cavity receiving an electronic printed circuit, a plurality of mutually separate housings extending side by side transversely relative to the reception cavity, a separating partition disposed between the reception cavity and the housings which defines a through opening between each of the housings and the reception cavity, and a plurality of ignition coils, each mounted in a corresponding one of the housings. Each ignition coil is fitted with a primary connector including 1) a fixing member for fixing the ignition coil to the box to enable the ignition coil to be mounted in a corresponding one of the housings, and 2) connection terminals between the ignition coil and the printed circuit.

Abstract: A high efficiency high voltage ignition coil with segmented high voltage bobbin (15) with the last few bays (16,17,18) having fewer secondary winding turns than the average and thicker flanges separating the bays, and further including an inductor (20) of inductance at least 0.5 mH with a core material which is lossy in the 100 KHz to 1 MHz range, the inductor located between the end of the high voltage winding and the spark gap (7b) so as to reduce the peak voltages across the last few high voltage bays immediately following the spark gap breakdown.

Abstract: A method and apparatus for securing at least one ignition coil to an ignition coil cassette, the ignition coil cassette having a main body portion being adapted to receive and engage a plurality of coils for generating a high voltage signal to be received by a spark plug of an internal combustion engine. The coils being ultrasonically welded to the main body portion of the ignition coil cassette. The coils being secured in a manner which correctly positions the coils in an appropriate location as well as providing a rigid securement of the coil to the main body portion.

Abstract: In an ignition coil for an internal combustion engine, the primary coil and the secondary coil of the coil unit are fabricated of self-welding wire and fixed in a coil case by an elastic material and an ignition control circuit unit is fixed in the coil case by an elastic material. Similarly, the primary coil and the secondary coil are integrally joined by an adhesive. The terminal of the primary coil and the lead of the ignition control circuit unit are joined together by fusion and the joint is partially molded, while the terminal of the secondary coil and the terminal of a high-tension cord outlet are joined together by fusing and the joint is partially molded. Moreover, the coil case is provided with an inner cap such that the fusing and partial molding of the terminals can be conducted on the inner cap, thereby ensuring a high recycle rate and enabling efficient resource recovery and reuse.