US 12,191,638 B2
Prechamber spark plug having improved ignition properties
Matthias Blankmeister, Heiligenhaus (DE); and Thomas Steidten, Ludwigsburg (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 18/571,350
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jun. 22, 2022, PCT No. PCT/EP2022/067035
§ 371(c)(1), (2) Date Dec. 18, 2023,
PCT Pub. No. WO2023/274813, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 10 2021 206 659.3 (DE), filed on Jun. 28, 2021.
Prior Publication US 2024/0283224 A1, Aug. 22, 2024
Int. Cl. H01T 13/54 (2006.01); H01T 21/02 (2006.01)
CPC H01T 13/54 (2013.01) [H01T 21/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A prechamber spark plug, comprising:
a housing having an external thread with a start of thread;
a central electrode and a ground electrode, wherein the central electrode and the ground electrode are arranged in a prechamber; and
a cap closing the prechamber towards a combustion chamber;
wherein through-holes are configured in the housing for a connection between the prechamber and an outer side of the prechamber spark plug,
wherein each of the through-holes is disposed at a different angle to a center axis of the prechamber spark plug relative to one another.