A spark plug having a housing, an insulator situated in the housing, a center electrode situated in the insulator and a ground electrode situated on the housing, the ground electrode and the center electrode being situated toward each other in such a way that the ground electrode and the center electrode form a spark gap, and the center electrode rest with a center electrode head on a seat developed on an inner side of the insulator, and the center electrode having an electrode base body and a core situated in the electrode base body, the core being made from a material that has a higher heat conductivity than the material of the electrode base body, the electrode base body having a diameter that is not greater than 1.7 mm.

A spark plug with an improved heat-dissipating capacity of the center electrode. The spark plug includes a ground electrode, a center electrode and a ceramic insulator, which is designed to accommodate the center electrode. The center electrode has a center-electrode head which lies in the direction of an electrical connection region of the spark plug and which includes an end face that is in contact with an electrically conductive connection element disposed between the electrical connection region and the center-electrode head. At its outer periphery, the center-electrode head is at least regionally in heat-conducting contact with the ceramic insulator and forms a heat-conducting contact region.

A spark plug with an improved heat-dissipating capacity of the center electrode. The spark plug includes a ground electrode, a center electrode and a ceramic insulator, which is designed to accommodate the center electrode. The center electrode has a center-electrode head which lies in the direction of an electrical connection region of the spark plug and which includes an end face that is in contact with an electrically conductive connection element disposed between the electrical connection region and the center-electrode head. At its outer periphery, the center-electrode head is at least regionally in heat-conducting contact with the ceramic insulator and forms a heat-conducting contact region.

A pair of electrode lugs clamp a bar at side surfaces of the bar so as to be electrically connected to the bar. The electrode lugs respectively include a first contact portion and a second contact portion having different front-back lengths. The bar is clamped such that the first contact portion having a short front-back length L1 opposes a back end portion of the bar within a range of the second contact portion having a front-back length L2. The back end surface of the bar is brought into contact with and welded to a front end surface of a metal shell by resistance butt welding. Since the first contact portion of one lug is short and is close to the abutting surfaces, heat dissipation can be reduced and heat concentration can be increased.

A combustor for a gas turbine engine includes a combustion chamber and a fuel igniter assembly. The combustion chamber is defined by an annular inner combustor liner and an annular outer combustor liner. The fuel igniter assembly is coupled to the combustor and extends radially outward from the outer combustor liner. The fuel igniter assembly includes an igniter housing configured to house a fuel igniter therein, and a heat-dissipating element coupled to the igniter housing. The heat-dissipating element includes a plurality of fins configured to dissipate heat from the fuel igniter assembly.

A combustor for a gas turbine engine includes a combustion chamber and a fuel igniter assembly. The combustion chamber is defined by an annular inner combustor liner and an annular outer combustor liner. The fuel igniter assembly is coupled to the combustor and extends radially outward from the outer combustor liner. The fuel igniter assembly includes an igniter housing configured to house a fuel igniter therein, and a heat-dissipating element coupled to the igniter housing. The heat-dissipating element includes a plurality of fins configured to dissipate heat from the fuel igniter assembly.

A spark plug electrode with an electrode tip formed on an electrode base using an additive manufacturing process, such as a powder bed fusion technique. The spark plug electrode includes an electrode base, an electrode tip that is formed on the electrode base and includes a precious metal-based material, and a thermally resilient joint that is located between the electrode base and the electrode tip, wherein the electrode tip and the thermally resilient joint together include a number of laser deposition layers.

A spark plug electrode with an electrode tip formed on an electrode base using an additive manufacturing process, such as a powder bed fusion technique. The spark plug electrode includes an electrode base, an electrode tip that is formed on the electrode base and includes a precious metal-based material, and a thermally resilient joint that is located between the electrode base and the electrode tip, wherein the electrode tip and the thermally resilient joint together include a number of laser deposition layers.

One example provides a spark plug including an axial centerline extending between a terminal end and a firing end, an insulative core including a central bore having a first diameter coincident with the axial centerline extending through the insulative core, an insulative nose proximate to the firing end, and a counter bore coincident with the axial centerline and extending axially into the insulative nose, the counter bore having a second diameter greater than the first diameter. A center electrode includes an electrode wire disposed within the central bore and having a first end extending into the counter bore, and an electrode head mechanically and electrically coupled to the first end of the electrode wire, a first portion of the electrode head seated within the counter bore to define an interface with the counter bore to provide a heat transfer path from the electrode head to the insulative core.

One example provides a spark plug including an axial centerline extending between a terminal end and a firing end, an insulative core including a central bore having a first diameter coincident with the axial centerline extending through the insulative core, an insulative nose proximate to the firing end, and a counter bore coincident with the axial centerline and extending axially into the insulative nose, the counter bore having a second diameter greater than the first diameter. A center electrode includes an electrode wire disposed within the central bore and having a first end extending into the counter bore, and an electrode head mechanically and electrically coupled to the first end of the electrode wire, a first portion of the electrode head seated within the counter bore to define an interface with the counter bore to provide a heat transfer path from the electrode head to the insulative core.