Back to results
US 8,569,940 B2Granted
Spark plug having ground electrode tip attached to free end surface of ground electrode
AssigneeFederal-Mogul Ignition Company
InventorsRichard L. Keller, Kevin J. Kowalski
Life of this patent
Estimating the term…
Abstract
A spark plug includes a metallic shell, an insulator, a center electrode body, a ground electrode body, and a ground electrode tip. In one embodiment, the ground electrode tip includes a non-precious metal piece and a precious metal piece attached to each other. The non-precious metal piece has a side surface attached to a free end surface of the ground electrode body.
Claims20
A spark plug, comprising:
- a metallic shell having an axial bore;
- an insulator having an axial bore and being disposed at least partially within said axial bore of said metallic shell;
- a center electrode body disposed at least partially within said axial bore of said insulator;
- a ground electrode body attached to said metallic shell and having a radially-facing free end surface;
- and
- a ground electrode tip including a non-precious metal piece and a precious metal piece attached together, said non-precious metal piece having a side surface attached to said radially-facing free end surface of said ground electrode body.
3 more elements
A spark plug, comprising:
- a metallic shell having an axial bore;
- an insulator having an axial bore and being disposed at least partially within said axial bore of said metallic shell;
- a center electrode body disposed at least partially within said axial bore of said insulator;
- a ground electrode body attached to said metallic shell and having an end portion tapering in size toward a radially-facing free end surface;
- and
- a ground electrode tip having a side surface attached to said radially-facing free end surface of said ground electrode body, wherein an axial extent of attachment between said side surface and said radially-facing free end surface constitutes a first axial extent L1 of said ground electrode tip, an axial extent of said ground electrode tip free of the attachment between said side surface and said radially-facing free end surface constitutes a second axial extent L2 of said ground electrode tip, and said first axial extent L1 is less than said second axial extent L2 in order to facilitate flame kernel growth in a combustion chamber.
3 more elements
A method of assembling a ground electrode body and a ground electrode tip, the method comprising the steps of:
- providing a non-precious metal piece and a precious metal piece;
- welding said non-precious metal piece and said precious metal piece together to form said ground electrode tip;
- and
- welding a side surface of said non-precious metal piece to a free end surface of said ground electrode body.
1 more element
Dependencies are inferred from the claim text.