Patent application number | Description | Published |
20110148274 | Spark Plug for a Gas-Operated Internal Combustion Engine - The invention relates to a spark plug for a gas-fired internal combustion engine, and Includes a metallic body, with an insulator fastened in the body. A central electrode, leads through the insulator and includes a protruding end of a precious metal alloy. An annular ground electrode is fastened to the body and surrounds the end of the central electrode which, at the inside thereof facing the central electrode is provided with a precious metal or with a precious metal alloy. The mutually facing surfaces of the central electrode and ground electrode formed by the precious metal or the precious metal alloy are coaxially disposed cylinder surfaces. A cap is provided and attached to the body and which, after installation of the spark plug into a combustion chamber of the internal combustion engine, shields the central electrode and the ground electrode from the combustion chamber. Together with the body of the spark plug, the central electrode forms an ante-chamber, in which the central electrode and the ground electrode are disposed. The cap having at least one opening, which enables a gas exchange between the ante-chamber and the space outside of the ante-chamber. According to the invention, a deviation of the cylinder surfaces from the ideal cylinder geometry is less than +−20 μm, and a deviation of the positions of the axes of the cylinder surfaces from their ideal coaxial position is less than +−50 μm. | 06-23-2011 |
20120235555 | SPARK PLUG AND METHOD FOR THE PRODUCTION THEREOF - A method for producing a spark plug which contains an inner conductor, an insulator surrounding the inner conductor, a spark plug body surrounding the insulator, and two electrodes forming an ignition gap. The first electrode is a center electrode connected to the inner conductor in an electrically conducting manner and the second electrode is a ground electrode connected to the spark plug body in an electrically conducting manner. An iridium component which contains more than 95 percent by weight of iridium is welded onto one of the electrodes. An iridium component that is punched out of an iridium sheet and has a thickness that is less in size than its diameter is also employed. | 09-20-2012 |
20120326591 | SPARK PLUG FOR GASOLINE ENGINES - Described is a spark plug for gasoline engines with an elongated hollow body made of metal, said body having a forward end with an undercut formed by an interior annular shoulder of the body and a rear end, with an elongated ceramic insulator which is mounted in the body and has a rear end that projects beyond the rear end of the body and has a forward end beyond which the forward end of the body projects, with a center electrode which is inserted into the insulator, projects beyond the forward end thereof, and is connected to a metal connection pin in an electrically conductive manner, said connection pin projecting beyond the rear end of the insulator, and with at least one ground electrode which starts from the forward end of the body and is approached to the center electrode to an electrode distance (EA) to form a spark gap. | 12-27-2012 |
20140055023 | Spark Plug - A spark plug having a spark plug body, a center electrode, and a rod-shaped ground electrode that is attached to a front end of the spark plug body and has an electrode end section with an end surface and two side surfaces. The electrode end section is provided with a step onto which is attached a precious metal component with an ignition surface that, together with the center electrode, forms a spark air gap. The step formed in the electrode end section and the precious metal component attached thereto extend across the entire width (B) of the electrode end section so that the precious metal component is flush with the electrode end section on the two sides surfaces, as well as the end surface. | 02-27-2014 |
20150114332 | IGNITION DEVICE FOR IGNITING FUEL/AIR MIXTURES IN A COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE BY CORONA DISCHARGE - Ignition device for igniting fuel/air mixtures in a combustion chamber of an internal combustion chamber by a corona discharge. The device includes an ignition electrode and an outer conductor surrounding the ignition electrode. The outer conductor has a front end and a rear end, and comprises an electrical insulator arranged between the ignition electrode and the outer conductor, from which insulator at least one tip of the ignition electrode protrudes. The at least one tip of the ignition electrode is arranged in a space that is shielded by a cap associated with the insulator, said cap having an inner side facing the insulator and an outer side facing away from the insulator as well as one or more holes, by means of which the shielded space is connected to a space arranged on the outer side of the cap. | 04-30-2015 |
20150260147 | METHOD FOR CONTROLLING A CORONA IGNITION SYSTEM OF A CYCLICALLY OPERATING INTERNAL COMBUSTION ENGINE - A method for controlling a corona ignition system in which a corona discharge is produced at an ignition electrode by exciting a resonating circuit with an AC voltage produced by a high-frequency generator. The AC voltage is adjusted to a target value depending on an operating state of the engine. Combustion onset is determined by evaluating an electrical variable of the resonating circuit and the target value of the AC voltage is reduced by a predefined value following a predefined number of engine cycles or a predefined operating period. The determined combustion onset is evaluated in one or more engine cycles. The target value for the momentary engine operating state is then increased if, by evaluation of the combustion onset, it is found that a predefined requirement is no longer met. Otherwise, the reduced target value is stored as a new target value for the momentary engine operating state. | 09-17-2015 |
20150311678 | SEALING RING FOR A SPARK PLUG OF AN INTERNAL COMBUSTION ENGINE, SPARK PLUG AND INTERNAL COMBUSTION ENGINE - A sealing ring for a spark plug that has an external thread for screwing into an internal combustion engine, a collar and a thread undercut between the external thread and the collar. The sealing ring includes a ring-shaped solid sealing element made from metal. The sealing element has two planar annular sealing surfaces that are arranged parallel to one another. An annular retaining element composed of an elastomer for engaging in the thread undercut of the spark plug in a self-retaining manner is attached to the sealing element on the inner ring side thereof. Also included is a spark plug comprising such a sealing ring, and an internal combustion engine comprising such spark plugs. | 10-29-2015 |
20150311679 | SPARK PLUG - A spark plug with an inner conductor, a center electrode connected with the inner conductor, an insulator surrounding the inner conductor and having a front end and a rear end, a spark plug body surrounding the insulator and having a front end and a rear end, and a ground electrode connected with the front end of the spark plug body. The front end of the spark plug body projects over the front end of the insulator, a recess is arranged at the front end of the insulator from which recess the center electrode projects and forms an air spark gap with the ground electrode, an annular intermediate space is formed by the recess between the insulator and the center electrode, and a surface of the recess runs in an at least partially curved manner between the center electrode and the end of the spark plug body so that the recess forms an insulating section that prevents a sliding spark between the center electrode and the spark plug body. | 10-29-2015 |