Spark plug electrode and spark plug
AssigneeFederal-Mogul Ignition Company
InventorDaniel Koenig
Life of this patent
Estimating the term…
Abstract
A spark plug having a firing tip that is attached to a ceramic-conductive interface can help promote thermal conductivity at the spark gap. The spark plug electrode includes a conductive core having a conductive weld zone and a ceramic sheath extending at least partially around the conductive core and having a sparking portion. The ceramic sheath and the conductive core form a ceramic-conductive interface at the sparking portion, the ceramic-conductive interface at least partially surrounding the conductive weld zone of the conductive core. The firing tip is bonded at the sparking portion within the conductive weld zone or bonded so as to at least partially overlap the ceramic-conductive interface.
Claims17
A spark plug electrode, comprising:
- a conductive core having a conductive weld zone;
- a ceramic sheath extending at least partially around the conductive core and having a sparking portion, wherein the ceramic sheath and the conductive core form a ceramic-conductive interface at the sparking portion, the ceramic-conductive interface at least partially surrounding the conductive weld zone of the conductive core;
- and
- a firing tip bonded at the sparking portion within the conductive weld zone or bonded so as to at least partially overlap the ceramic-conductive interface, wherein the ceramic sheath has a mechanical interlock portion configured to join the firing tip or a shell of a spark plug.
A spark plug electrode, comprising:
- a conductive core having a conductive weld zone;
- a ceramic sheath extending at least partially around the conductive core and having a sparking portion, wherein the ceramic sheath and the conductive core form a ceramic-conductive interface at the sparking portion, the ceramic-conductive interface at least partially surrounding the conductive weld zone of the conductive core, wherein the conductive core and the ceramic sheath create a bridging ground electrode body;
- and
- a firing tip bonded at the sparking portion within the conductive weld zone or bonded so as to at least partially overlap the ceramic-conductive interface.
A spark plug electrode, comprising:
- a conductive core having a conductive weld zone;
- a ceramic sheath extending at least partially around the conductive core and having a sparking portion, wherein the ceramic sheath and the conductive core form a ceramic-conductive interface at the sparking portion, the ceramic-conductive interface at least partially surrounding the conductive weld zone of the conductive core, wherein the ceramic sheath is made of a ceramic material that is configured to minimize oxidation of chromium carbides in the conductive core, wherein the ceramic material is aluminum nitride based;
- and
- a firing tip bonded at the sparking portion within the conductive weld zone or bonded so as to at least partially overlap the ceramic-conductive interface.
Dependencies are inferred from the claim text.