Spark plug with improved ground electrode

Abstract

A spark plug. The spark plug includes a metallic housing, an insulator, a central electrode, and a ground electrode which is positioned laterally to the central electrode, having a main part and a precious metal element, wherein the main part has a fixing region for fixing the ground electrode on the housing and a welding region, and the precious metal element is arranged on the welding region using welded connection. A first transition region is arranged between the fixing region and the welding region, and the cross-sectional surface area of the fixing region is larger than a cross-sectional area of the welding region. The first transition region has a specified extension in the axial direction Y-Y of the ground electrode and provides a geometric connection and a functional separation between the fixing region and the welding region.

Dependencies are inferred from the claim text.