Pre-chamber spark plug having improved heating management
AssigneeRobert Bosch GmbH
InventorsMatthias Blankmeister, Stephan Kaske
Life of this patent
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Abstract
A pre-chamber spark plug. The pre-chamber spark plug includes a central electrode and at least one ground electrode, a housing, an insulator that electrically insulates the central electrode from the housing, a cap having at least one cap hole, and a pre-chamber having a defined gas volume. The insulator includes a base portion which protrudes into the pre-chamber in the axial direction over a base length and which is in contact with the gas volume, and wherein a ratio of the gas volume to the base length is in a range of: R=40 to 300 mm2.
Claims10
A pre-chamber spark plug, comprising:
- a central electrode and at least one ground electrode;
- a housing;
- an insulator which electrically insulates the central electrode from the housing;
- a cap with at least one cap hole;
- and
- a pre-chamber having a defined gas volume;
- wherein the insulator has a base portion which protrudes into the pre-chamber over a base length in a axial direction and is in contact with the gas volume;
- and
- wherein a ratio R of the gas volume to the base length is in a range of:
- R=40 to 300 mm2.
An internal combustion engine, comprising:
- a pre-chamber spark plug including:
- a central electrode and at least one ground electrode;
- a housing;
- an insulator which electrically insulates the central electrode from the housing;
- a cap with at least one cap hole;
- and
- a pre-chamber having a defined gas volume;
- wherein the insulator has a base portion which protrudes into the pre-chamber over a base length in a axial direction and is in contact with the gas volume;
- and
- wherein a ratio R of the gas volume to the base length is in a range of:
- R=40 to 300 mm2.
Dependencies are inferred from the claim text.