Abstract: A plug boot contains an ignition cable which is fitted with the stud terminal of a spark plug extending from an engine cylinder block. This plug boot is covered with a heat shield, and further with an auxiliary heat shield. The cylinder-side end portion of the auxiliary heat shield is fixed between the spark plug and the cylinder block. The cable-side end portion of the auxiliary heat shield is provided with a lid unit. This lid unit includes a fixing retaining member and a pressing portion. The fixing retaining member fits the lid unit to the auxiliary heat shield, while the pressing portion exerts downward forces on the plug boot. By the combination of fitting forces and downward forces, the ignition cable and the spark plug are reliably connected.

Abstract: In an internal combustion engine with direct fuel injection, which comprises a number of operating elements each including a combustion chamber delineated by an internal wall of a cylinderhead and a piston movably disposed in a cylinder, an injector mounted in the cylinderhead has a fuel injection nozzle which injects fuel into the combustion chamber in a cone-like pattern wherein an ignitable fuel/air mixture is formed and a spark plug is mounted on the cylinderhead within a spark plug sleeve which extends into the combustion chamber and forms, adjacent the spark plug electrodes, an ignition chamber which is in communication with the interior of the cone-like fuel spray pattern so as to receive therefrom an easily ignitable relatively rich fuel mixture which, upon ignition by the spark plug, generates a flame beam igniting the fuel mixture within the cone-like spray pattern.

Abstract: An ignition device with a series gap includes a series gap assembly having therein a discharge tube. A shielding case is provided to cover the series gap assembly. The shielding case is made of a conductive material and arranged to be in contact with a cylinder head or an engine block so that electrical continuity is held between the shielding case and the cylinder head or the engine block. Accordingly, the shielding case effectively works to provide a reliable electric shielding between the exterior and interior of the shielding case so that electromagnetic wave caused by sparking of the discharge tube is prevented from leaking outside and an ambient electric field is prevented from affecting a discharge characteristic of the discharge tube.

Abstract: An ignition coaxial cable includes at least a braided layer of copper wires surrounding a central or inner conductor existing at a longitudinal center of the coaxial cable for shielding and grounding the interference caused by the high voltage carried by the cable, and an interference eliminating circuit having an inductor parallelly connected with a high-impedance resistor and connected in series with a low-impedance resistor to prevent the acute wave forms and to inhibit the surge waves caused by the high-tension voltage pulses delivered from the distributor to the plug, thereby eliminating the interference or electromagnetic interference caused by the high-tension cable and the plug of the car.

Abstract: A sparking plug cap for internal combustion engines which is made of a resin selected from the group consisting of an alloy of polyphenylene sulfide and polyphenylene oxide, polyarylate, polyether imide and a liquid crystalline polymer, which sparking plug cap is excellent in insulation durability at a high temperature, particularly under a high humidity or in the presence of water.

Abstract: A coupling construction for coupling a high-voltage terminal of an ignition coil for use in an internal combustion engine and an electric conductor with each other. The high-voltage terminal is inserted into the electric conductor. An engaging ring engages the peripheral surface of the electric conductor. An engaging convex portion of the engaging ring projecting inward toward the high-voltage terminal through a through-hole engages the engaging concave portion of the high-voltage terminal due to the contraction of the engaging ring. After the high-voltage terminal and the electric conductor are coupled with each other, a moving sleeve engages the peripheral surface of the engaging ring, thereby preventing the diameter of the engaging convex portion of the engaging ring from expansionarily increasing more than a predetermined length.

Abstract: To be utilized to maintain a spark plug in electrical engagement with an electric boot, a spark plug keeper having a ring-shaped base adapted to receive a lower portion of the spark plug therein and to bear against the underside of a hex nut included on the spark plug, the spark plug being in electrical engagement with an interior of a boot. The ring-shaped base further includes at least one upstanding finger which is internally barbed and is made of a flexible material and at its upper end is provided with a cable that is drawn tightly thereabout such that the boot will be maintained in electrical engagement with the spark plug, the ring being formed of a strong, yet flexible material such that the cable will substantially tighten the outstanding fingers, and more particularly the internal barbed surface about the spark plug boot.

Abstract: Several variations of ignition cable assemblies that have a cable seal and a tower seal enclosing a terminal and a heat shrunk sleeve and their method of manufacture are disclosed. The cable seal insulates a substantial portion of the terminal to increase the dielectric strength of the assembly. The tower seal includes an elastomeric boot that is radially spaced from the contact of the terminal to sealingly engage an outer surface of a male or female tower. The heat shrunk sleeve forms at least part of the cable seal and it may be used to provide an angled dress for the ignition cable or to accommodate an angled terminal.

Abstract: A slippage preventer for an ignition cable terminal comprises a holder cap 11 for covering a head of a grommet 3, a holder body 10 having an opening 10a into which the grommet is inserted and for covering a lower hanging portion, and locking means provided on the holder body 10 for engaging with a fitting portion provided on said ignition tower so that the holder body is secured to the ignition tower. The holder cap 11 is rotatably supported on the holder body 10. The preventer has a very simple construction and can set a direction of the grommet 3 to be attached to an ignition tower irrespective of the kind of the tower.

Abstract: A spark plug connector for connecting an ignition cable to a recessed contact button of a spark plug comprises a boot assembly and a terminal assembly. The boot assembly includes a thermoplastic tubular boot that has an internal suspended terminal support tube and an external arm for securing the spark plug connector to an engine head. The boot assembly also includes an insert molded elastomeric seal that provides spark plug and ignition cable seals at the respective ends of the boot. The terminal assembly comprising a pin terminal, a pin terminal retainer and a coil compression spring. The pin terminal retainer includes a sleeve that is disposed in the terminal support tube and a forward latch tang that prevents withdrawal of the terminal assembly from the boot assembly. The pin terminal in the sleeve of the pin terminal retainer and an enlarged head that serves as the electrical contact that is pushed forwardly by the compression spring to engage the recessed contact of the spark plug assembly.

Abstract: A combustion apparatus and a combustion system for an internal combustion engine wherein a funnel-shaped cone with an orifice at the apex thereof is provided in a combustion chamber and spaced from an ignition apparatus so that as a gaseous, combustible mixture is introduced into the chamber, it flows through the cone to the orifice where it is ignited by the ignition apparatus so that the flame caused thereby explodes outwardly through ejection openings and along the external surface of the cone into the chamber so as to envelope the uncombusted gases and cause maximum explosion and combustion of the mixture automatically. The structure is applicable to existing conventional spark ignition engines when the cone is provided at the front end portion of the spark plug. For compression ignition engines, the cone is provided in a pre-combustion chamber in the cylinder head or is attached to the cylinder head and extends into a chamber provided in the piston.

Abstract: An SOHC type internal combustion engine having a cam shaft for opening and closing intake and exhaust valves via rocker arms, the cam shaft being held between a cam shaft receiving wall of a cylinder head and a cam shaft holder which is secured to the cam shaft receiving wall, wherein a hole for allowing insertion of an ignition plug into a plug mounting hole is formed in the cam shaft receiving wall and opens to the surface of the wall against which a cam shaft holder abuts, and a hole for guiding a high power cord for an ignition plug is formed between the mutually abutting surfaces of the cam shaft receiving wall and the cam shaft holder.

Abstract: A connecting device for ignition cables and a component in motor vehicle ignition system having a plurality of ignition cables with a L-shape hood of elastic materials which is attached to each of the cable terminals, housing of connecting device with hood supporting member for holding the hood in a mating alignment to outside terminals, and a locking member in the housing.

Abstract: An ignition system of an engine has a coil which is spaced away from an igniter to protect the coil from heat of a combustion chamber and combustion gas leakage. The electrical connections between the coil and igniter of current design practice have not performed satisfactorily due to loosening of connections, absorbtion of energy within the connectors and the escape of electrical energy. The present ignition extender overcomes these shortcomings by resiliently biasing a first electrical conducting core into contact with a source of high energy and a second electrical conducting core into contact with an igniter and insulating the first and second electrical conducting cores and a biasing and providng mechanism from the surrounding environment by surrounding them with a first and second telescopingly arranged insulating members. When included in an engine, the extender is combined with a shield to further protect and increase the functional life of the components.

Abstract: A spark plug cap apparatus for an internal combustion engine having relatively deep and generally vertical spark plug receiving bores. The upper end of the bore is provided with an annular protrusion. A resilient head cover has a bent flange for extending over and sealably engaging the annular protrusion. The head cover has a downwardly extending seal lip for engaging the inside of the bore. A pipe is molded to the head cover and extends downwardly to engage the top of the spark plug. The spark wire extends through the head cover and pipe. A vent hole is provided in the head cover.

Abstract: Arrangement for inserting a spark plug in a V-type engine cylinder head, comprising a separate sleeve surrounding the spark plug and removably insertable in the wall of the combustion chamber by screw threading. The spark plug extends through the cam chain chamber and can be removed without interference with the operation of the endless cam chain.

Abstract: Disclosed herein is an internal combustion engine including an ignition port having an outlet opening into a cylinder combustion chamber, a spark plug mounted in the ignition port, and a deflector located on the cylinder head adjacent the ignition port outlet. The deflector surrounds the side of ignition port outlet closest to the fuel intake port and diverts lubricant and/or other heavy residuals collecting on the cylinder head around the ignition port outlet so as to minimize fouling of the spark plug.

Abstract: A shielding device for spark plugs which are oriented in an engine block by a key and keyway means such that the electrodes of the spark plug are located in a predetermined orientation in a combustion chamber in the engine. The spark plug is secured in place by a shielding enclosure to prevent radio frequency interference and also to provide an explosion-proof chamber around the spark plug. The shield of the spark plug is provided with an externally threaded section which is threadedly secured to a mating threaded section on the vehicle engine block. The shield is provided with an inner conical surface abutting against a shoulder on the body of the spark plug in order to axially force the plug into the engine block with shoulder to shoulder contact.

Abstract: The protection against interference emitted by automobile internal combustion engines or other vehicles is provided by an element for a spark plug or for a distributor, comprising a shield 3, a resistor 4 increasing with the frequency to be filtered and a capacitor 5, selected in such a manner that the RC product is higher than the time constant corresponding to the cut-off frequency.Good reduction of interference is obtained between 10 and 1000 MHz.

Abstract: An ignition wiring system having the leads formed as a wire coil about a magnetizable core defines a distributed constant resistive-inductive series impedance. A metal shield is located over the spark plug proper and electrically connected to the engine ground. A flexible shield extension in the form of a coil extends over the lead from beneath the shield. The shield and shield extension introduce distributed capacitance between the special lead and engine ground. The combination of the shield and shield extension with the special lead forms a distributed constant RLC filter which produces RFI suppression. The shield and shield extension confine the electromagnetic radiation emanating from that portion of the lead where the radiation is strongest, thereby enhancing the suppression. The rapid discharge by the spark plug of the stored energy contained in the distributed capacitance increases the spark intensity and promotes more complete combustion.

Abstract: A module for use in the ignition system of a spark ignited engine combines in one unit a spark plug connector or cap and an ignition coil for converting low voltage current changes into the high voltage pulses required for firing the associated plug, the module, therefore, eliminating the need for a separate high-tension conductor of substantial length between the ignition coil and the spark plug. The module is mounted to an engine shroud directly outboard of the spark plug so as to electrically cooperate with the plug while nevertheless not relying on the plug for its structural support.