Spark plug having combined surface and air gaps
AssigneeBeru Reprecht GmbH & Co. KB
InventorWerner Niessner
Life of this patent
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Abstract
A spark plug with combined surface discharge and air discharge gaps, wherein a central electrode (3), an insulator (2) surrounding the central electrode, and a ground electrode (4) surrounding the insulator (2) together with a spark plug body (1) are provided. The insulator (2) forms at its end portion a discharge chamber (5) through which the central electrode (3) extends axially as far as the end portion of the spark plug body (1). The earth electrode surrounds the insulator (2) around its end with a projection extending into the discharge chamber (5).
Claims20
A spark of the type having combined surface discharge and air discharge gaps, wherein said spark plug comprises a spark plug body, a central electrode, an insulator surrounding the central electrode, and a ground electrode, wherein the ground electrode surrounds the insulator together with the spark plug body;
- wherein the insulator has an end portion at a radial distance from the central electrode which forms a discharge chamber into which the central electrode extends;
- wherein said ground electrode surrounds the end portion of the insulator and has a projection extending into the discharge chamber;
- and wherein the central electrode extends axially through the discharge chamber as far as an end portion of the spark plug body as a means for enabling an air and surface spark to be produced as well as air gap and pure surface discharges.
A spark of the type having combined surface discharge and air discharge gaps, wherein said spark plug comprises a spark plug body, a central electrode, an insulator surrounding the central electrode, and a ground electrode, wherein the ground electrode surrounds the insulator together with the spark plug body;
- wherein the insulator has an end portion at a radial distance from the central electrode which forms a discharge chamber into which the central electrode extends;
- wherein said ground electrode surrounds the end portion of the insulator and has a projection extending into the discharge chamber;
- and wherein the central electrode extends axially through the discharge chamber as far as an end portion of the spark plug body wherein an end of the projection of the ground electrode extending into the discharge chamber is rounded as a means for preventing field distortions.
Dependencies are inferred from the claim text.