Patent DE-102010016744-A1 (DE)
Title: Spark plug for plasma ignition of fuel-containing mixtures in internal combustion engines and internal combustion turbines, comprises a central electrode, a ground electrode, and a coil which is connected to ground with its one end
Inventor: GOLDAMMER STEFAN
IPC: H01T13/50
Filed: 2010-05-03
Abstract: The spark plug for plasma ignition of fuel-containing mixtures in internal combustion engines and internal combustion turbines, comprises a central electrode (2), a ground electrode, and a coil (3), which is connected to ground with its one end and consists of an electrically conducting material, where the other end of the coil forming an ignition contact as the ground electrode lies at a distance from the central electrode enabling an ignition spark to jump across. The coil is arranged in the area of an ignition chamber, so that a magnetic field is produced in the area of the chamber. The spark plug for plasma ignition of fuel-containing mixtures in internal combustion engines and internal combustion turbines, comprises a central electrode (2), a ground electrode, and a coil (3), which is connected to ground with its one end and consists of an electrically conducting material, where the other end of the coil forming an ignition contact as the ground electrode lies at a distance from the central electrode enabling an ignition spark to jump across. The coil is arranged in the area of an ignition chamber, so that a magnetic field is produced in the area of the ignition chamber during each ignition process to cause a volume expansion of ignition-spark plasma. The coil, whose end forming the ignition contact is formed as an annular pole end, lies with its axis in the extension of the spark plug axis. The central electrode lies with its end forming the ignition contact within the coil. The radially outwardly directed two coils are arranged to the central electrode with their axis, where the outer lying ends (6) of the coils are connected to ground and the inner lying ends of the coils are connected to a common ignition contact oppositely lying to the central electrode with a distance. The inner lying ends of the coils are connected to a common pole ring forming the ignition contact. The central electrode contains two radially outwardly directed electrode twigs and the radially outwardly directed coils corresponding to the number of the electrode twigs with their axis., where the outer ends of the coils have the shape of annular pole ends forming the ignition contact. The diameter of the annular pole ends is smaller than the coil diameter. The electrode twigs end within the coils. The central electrode is partially surrounded by insulating material. Each coil is wound on a cylinder body made of insulating material. Each coil is partially cast in a body made of highly-insulating, temperature-resistant material. The coils made of wire are wound with a diameter of 0.3-1.2 mm. The outer diameter of each coil has a value of 3-10 mm and the inner diameter of each coil has a value of 2.4-7.6 mm. Each coil runs in a conical manner and/or wound in a multi-layered insulating manner. The central electrode consists of stranded twisted material structure, which is spring-fed at the end corresponding to the arrangement of the pulse-plasma coils in a geometrical manner. An independent claim is included for a method for plasma ignition of fuel-containing mixtures in internal combustion engines and internal combustion turbines.