Robert Boschgmbh

Jochen Fischer

Andreas Benz

Detlef Hartmann

Heinz Ulm

Dietrich Trachte

Dittmar Klett

Mario Fleischhauer

Walter Benedikt

Roland Mueller

Thomas Kretschmar

Hermann Kersting

Thomas Juestel

Simon Schmittinger

Manfred Roeckelein

Rainer Kocik

Stephan Weigel

Konrad Funk

Martin Klassen

Christoph Naumann

Peter Metzler

Heidrun Lange

A spark plug, including a central electrode, a first ground electrode, which is situated in a curved shape having a horizontal area and an essentially vertical area, and at least one second ground electrode, which is situated adjacent to the central electrode in such a way that a distance between the first ground electrode and the central electrode is less than a distance between the second ground electrode and the central electrode.

Spark plug having long service life

An electrode for a spark plug includes an electrode base material and a noble metal element, the noble metal element being fastened to the electrode base material using a welding connection. The welding connection has a maximum extension perpendicular to an area of the electrode at which the noble metal element is fastened, and the welding connection has a maximum width at the area. A ratio of the maximum extension to the maximum width is greater than, or equal to 3.

Electrode for a spark plug and method for its production

A spark plug including a housing as a ground contact to an internal combustion engine, a center electrode situated in the housing along a center axis of the spark plug, an insulator between the center electrode and the housing, and a two-legged ground electrode whose legs are located on the combustion chamber side of the center electrode and angled with respect to one another in a leg plane which is perpendicular to the center axis, the two ends of the ground electrode being connected to the housing respectively by one connection point, a first gap between one end of the housing on the combustion chamber side and the leg plane being smaller than or equal to a second gap between one of the connection points and the center axis, and/or the ground electrode being tapered toward the center axis.

Spark plug

A spark plug for an internal combustion engine, having an insulator including an insulator shoulder designed for mounting a tensioning nut or a housing and having a first outer diameter, an insulator head which is situated farther from the combustion chamber and adjoins the insulator shoulder, and which has a second outer diameter which is smaller than the first outer diameter, and a continuous cavity, a composition including a first contact composition, a second contact composition, and a composition resistor situated between the first contact composition and the second contact composition, a connecting pin which contacts the first contact composition, a center electrode which contacts the second contact composition, and a ground electrode. The connecting pin, the composition, and the center electrode are situated in the cavity, and the composition resistor has a third outer diameter, and a ratio of the third outer diameter to the second outer diameter is between 0.35 and 0.7.

Leadless package housing having an insulator and composition

A method for producing a spark plug is provided, which includes a ground electrode fixed to a housing, and a center electrode insulated electrically from the housing by an insulator, the ground electrode having a ground electrode base and a ground electrode section, which ground electrode section including an electrode base and a noble metal section. In order to produce the spark plug, the ground electrode base is connected to the ground electrode section, in which, in a first step, the electrode base is connected to the noble metal section to form the ground electrode section, and in a second step, the ground electrode section is connected to the ground electrode base.

Method for producing a spark plug electrode

A method for manufacturing a spark plug having a central electrode and a ground electrode, the central electrode and the ground electrode being spaced apart from each other and a first planar electrode face being formed on the central electrode and a second planar electrode face being formed on the ground electrode by a separative manufacturing method.

Method for manufacturing a spark plug having a laterally oriented ground electrode

A spark plug for an internal combustion engine includes a ground electrode, a center electrode, an insulator, a housing, and a folded packing which is situated on an outer circumference of the housing. The folded packing has: a hollow profile in cross section; a free leg directed outwards; and a support region. The folded packing lies on a contact surface in a support region, and the free leg is situated at an angle to the support region. The folded packing is pressed together during the mounting of the spark plug, and the free leg of the folded packing is designed to bend over in the direction of the support surface during the mounting to provide a diameter enlargement of the folded packing.

Spark plug incorporating a folded packing situated on an outer circumference of a housing for position-oriented installation

A method of joining an electrode of a spark plug with a noble metal is described, the noble metal being joined locally with the electrode using a thermal input produced by a continuously operating laser beam.

A spark plug includes at least one ground electrode with a reduced temperature level. The spark plug encompasses a tubular metallic housing that has, at the combustion-chamber end, an outer rim on which at least one ground electrode is positioned. The cross-sectional area of the at least one ground electrode increases toward the outer rim of the housing.

An electrode and spark plug for an internal combustion engine including an electrode of this type as a center electrode. The electrode includes an electrode base element made of a first material and an end section that is integrally joined to the electrode base element, with this end section including a first area that is integrally joined to the first material and is made of a platinum-containing material and including a second area that is integrally joined to the first area and is made of an iridium-containing and/or ruthenium-containing material. In a method for manufacturing an electrode of this type, a first recess is stamped in the electrode base element, a first preform is inserted into the first recess, the first preform is melted, thereby forming a first alloy, a second recess is stamped in an area of the first alloy, a second preform is inserted into the second recess, and the second preform is melted, thereby forming a second alloy.

Electrodes, method for production thereof and spark plugs with such an electrode

A spark plug for an internal combustion engine includes a middle electrode which has an electrode base body ( ) with an end face ( ) oriented toward the combustion chamber, to which end face a precious metal platelet ( ) is attached. An end section ( ) of the electrode base body oriented toward the combustion chamber is formed in the shape of a truncated cone. The precious metal platelet ( ) is likewise formed in the shape of a truncated cone and the diameter of the end face ( ) of the electrode base body oriented toward the combustion chamber corresponds to the diameter of the end face ( ) of the precious metal platelet oriented away from the combustion chamber. A method for producing middle electrodes for a spark plug of an internal combustion engine is also proposed.

Spark plug for an internal combustion engine and method for production of a middle electrode for an internal combustion engine spark plug

A spark plug electrode having a welded-on noble-metal part for a longer service life of the spark plug. Prior to the welding process, the noble-metal part is provided with a profiling on the side facing the spark plug electrode.

Spark plug electrode including a profiled noble-metal part

A spark plug for internal combustion engines ensures the formation of two spark paths. These two spark paths are a pure air spark which jumps over from electrode to electrode, and a creepage spark which emerges from the central electrode, creeps along the insulator and then jumps over at the point at the smallest distance between the insulator and the earth electrode. The spark plug includes a cylindrical metal tube which forms a housing and in which the central electrode is arranged, surrounded centrally by an insulator. The earth electrodes mounted on the metal tube are partially bent so that an obtuse bending angle of the bent-over part with respect to the part of the earth electrode which extends in the direction of the rotationally symmetrical longitudinal axis is produced.

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Bamberg, Germany

Jochen Fischer