Dkt Verwaltungs-gmbh

Caterpillar Inc.

Steffen Kuhnert

James Jay Cress

Georg Maul

Spark plug

A prechamber spark plug having a housing, which at its front end comprises a prechamber with an ignition electrode arranged therein, wherein the ignition electrode comprises a base and electrode legs protruding from the base, wherein the ignition electrode is machined from a sheet made of an iridium alloy and the legs are bent out of the plane of the base to form a basket shape, characterized in that the ignition electrode, in particular the electrode legs, is/are separated out of the sheet metal by means of laser cutting. Furthermore, a corresponding ignition electrode and a method for producing such an ignition electrode are claimed.

Prechamber spark plug, ignition electrode for a prechamber spark plug and method for producing an ignition electrode

A pre-chamber spark plug includes a housing, a ground electrode, and a pre-chamber defined by the housing and a cap, a center electrode being arranged within the pre-chamber, in which the V/D ratio of the pre-chamber volume V to the largest internal diameter D of the pre-chamber () is in the range of from 30 mm2 to 95 mm2.

Prechamber spark plug

This disclosure relates to a pre-chamber spark plug including a housing, a ground electrode, a cap enclosing a pre-chamber, and a center electrode inside the pre-chamber, with transfer passages being formed in the cap. Center axes of the transfer passages diverge from a longitudinal direction of the main combustion chamber. A method of manufacturing such a pre-chamber spark plug is also disclosed. The method includes generating a housing, generating a ground electrode, and generating a cap enclosing a pre-chamber and having transfer passages formed in the cap. The method may further include generating a center electrode inside the pre-chamber, such that center axes of the transfer passages diverge from a longitudinal direction of the main combustion chamber. The method further includes generating the cap by a forming process from a raw material wire or from raw material bars. The method may further include compacting a material forming the cap.

Pre-chamber spark plug and method for producing a pre-chamber spark plug

A pre-chamber spark plug for igniting a fuel-air mixture in an internal combustion engine, in particular a gasoline engine, comprises a spark plug body () having a pre-chamber housing () and a cap () which at least partially closes the pre-chamber (), and further comprises a ground electrode () in the spark plug body () as well as a central electrode () which protrudes into the pre-chamber (); the ground electrode () has an annular shape and, on the inner surface thereof, includes at least one ignition area () designed as a cam () as well as a radially inward extending protrusion () as a baffle ().

Prechamber spark plug for igniting a fuel-air mixture in an internal combustion engine

A prechamber spark plug for igniting a fuel-air mixture in an internal combustion engine, in particular a gas engine, having a spark plug body () comprising a prechamber housing () and a cap () that closes the prechamber () at least partially, a ground electrode () and a central electrode () isolated from the ground electrode and projecting into the prechamber, is designed and developed with simple structural means in order to obtain advantageous igniting properties, the ground electrode () being designed for that purpose essentially as a cylindrical pin () that can be welded in a passage (), preferably a bore (), in the spark plug body ().

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Heidelberg, Germany

Steffen Kuhnert