Patent ID: 9083154
Filing Date: 2015-07-14
Classification: H01T

Abstract:
1. A spark plug, comprising: a center electrode extending in a longitudinal direction of the spark plug; a spark plug body having a front end and a rear end; a rod-shaped ground electrode being attached to the front end of the spark plug body and having an electrode end section extending transversely relative to the longitudinal direction of the spark plug, the electrode end section having a step, an end surface, and two side surfaces with the end surface and the two side surfaces being oriented in the longitudinal direction of the spark plug, the two side surfaces defining a width (B) of the electrode end section that extends transversely relative to the longitudinal direction of the spark plug, and the two side surfaces being connected to each other by the end surface; a precious metal component being attached to the step of the electrode end section and having an ignition surface, the precious metal component being flush with the end surface of the electrode end section, the ignition surface of the precious metal component being oriented transversely relative to the end surface of the electrode end section and, the ignition surface of the precious metal component together with the center electrode forming a spark air gap; wherein the step of the electrode end section and the precious metal component 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 side surfaces as well as on the end surface, and the precious metal component and the electrode end section are attached by means of a welding seam that forms an alloy zone composed of the materials of the precious metal component and the electrode end section, the welding seam extends along an interstice that is between the precious metal component and the electrode end section and is located on the end surface of the electrode end section, on the surface of the electrode end section that adjoins the precious metal component and is oriented towards the center electrode, and on the two side surfaces of the electrode end section.