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US 12,609,512 B2Granted
Spark plug with a sealing earth electrode
AssigneeRobert Bosch GmbH
InventorLars Menken
Life of this patent
Estimating the term…
Abstract
A spark plug. The spark plug includes a housing; an insulator arranged within the housing; a center electrode arranged within the insulator; and an earth electrode arranged within the housing and between the housing and the insulator. The earth electrode and the center electrode are arranged such that they form a spark gap, and the spark gap is within the housing.
Claims10
A spark plug, comprising:
- a housing;
- an insulator arranged within the housing;
- a center electrode arranged within the insulator;
- and
- an earth electrode arranged within the housing and between the housing and the insulator;
- wherein the earth electrode and the center electrode are arranged such that they form a spark gap, and the spark gap is within the housing,
- wherein the housing has a projection on its inner side, the earth electrode being arranged between the housing projection and the insulator and providing a seal,
- wherein the insulator has a step at a combustion chamber-side end of the insulator, and the earth electrode is attached to the step to form a form-fitting connection that fixes the earth electrode to the insulator.
5 more elements
A production method for a spark plug, comprising the following steps:
- a) providing a pre-fitted spark plug cap with an insulator and a center electrode;
- b) providing the earth electrode;
- c) attaching the earth electrode to the spark plug cap;
- d) aligning the earth electrode and setting the spark gap;
- and
- e) fastening the earth electrode to the spark cap, wherein the insulator has a step at a combustion chamber-side end of the insulator, and the earth electrode is attached to the step to form a form-fitting connection that fixes the earth electrode to the insulator.
3 more elements
Dependencies are inferred from the claim text.