Pre-chamber spark plug
AssigneeFederal-Mogul Ignition Company
InventorsWerner Niessner, Peter Janas, Alexander Ott
Life of this patent
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Abstract
A pre-chamber spark plug having a shell, an insulator disposed at least partially within the shell, a center electrode disposed at least partially within the insulator, a ground electrode forming a spark gap with the center electrode, and a pre-chamber cap connected to the shell and forming a pre-chamber. The pre-chamber cap includes two or more openings that are configured so that at least one inflowing fuel-air mixture jet is directed to a pre-chamber wall gap so as to flush out or remove gas from a previous ignition cycle. The two or more openings are angled so that a first inflowing fuel-air mixture jet of a first opening does not intersect with a second inflowing fuel air-mixture jet of a second opening.
Claims19
A pre-chamber spark plug, comprising:
- a shell;
- an insulator disposed at least partially within the shell;
- a center electrode disposed at least partially within the insulator;
- a ground electrode forming a spark gap with the center electrode;
- and
- a pre-chamber cap connected to the shell and forming a pre-chamber, the pre-chamber cap including two or more openings;
- wherein the two or more openings are configured so that at least one inflowing fuel-air mixture jet is directed to a stepped wall portion so as to flush out or remove gas residing in a pre-chamber wall gap from a previous ignition cycle, the pre-chamber wall gap is disposed at least partially between the insulator and a pre-chamber wall that is an exposed inner wall of the shell, the stepped wall portion is disposed at least partially between the exposed inner wall of the shell and the pre-chamber cap, and
- wherein the two or more openings are angled so that a first inflowing fuel-air mixture jet of a first opening does not intersect with a second inflowing fuel air-mixture jet of a second opening.
A pre-chamber spark plug, comprising:
- a shell;
- an insulator disposed at least partially within the shell;
- a center electrode disposed at least partially within the insulator;
- a ground electrode forming a surface discharge spark gap with the center electrode, wherein the surface discharge spark gap is located along an outer surface of the insulator;
- and
- a pre-chamber cap connected to the shell and forming a pre-chamber, the pre-chamber cap including two or more openings;
- wherein the two or more openings are each configured so that at least one inflowing fuel-air mixture jet is directed to a pre-chamber wall gap so as to flush out or remove gas from a previous ignition cycle, and
- wherein the pre-chamber wall gap is disposed at least partially between the insulator and a pre-chamber wall that is an inner wall of the shell or an inner wall of the pre-chamber cap.
A pre-chamber spark plug, comprising:
- a shell having an inwardly protruding portion;
- an insulator disposed at least partially within the shell and having a large-diameter portion, an axially-free end, and a curved outer surface that merges the large-diameter portion with the axially-free end;
- a center electrode disposed at least partially within the insulator;
- a ground electrode disposed at least partially between the inwardly protruding portion of the shell and the curved outer surface of the insulator and forming a surface discharge spark gap with the center electrode;
- and
- a pre-chamber cap connected to the shell and forming a pre-chamber, the pre-chamber cap including two or more openings;
- wherein a pre-chamber wall gap is disposed at least partially between the insulator and a pre-chamber wall, the pre-chamber wall being an exposed inner wall of the shell or an exposed inner wall of the pre-chamber cap, and
- wherein the pre-chamber wall includes a stepped wall portion.
Dependencies are inferred from the claim text.