Patent ID: 11876351
Assignee: ROBERT BOSCH GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A prechamber spark plug, comprising:
a center electrode;
a ground electrode;
a housing having an external thread;
a cap disposed on the housing and together with the housing defines a prechamber; and
an insulator which electrically insulates the center electrode from the housing;
wherein the external thread of the housing has a thread length in an axial direction of the prechamber spark plug;
wherein the housing is fastened to the insulator at a first fixing region and a second fixing region such that a first clamping force at the first fixing region acts from the housing on the insulator, and a second clamping force at the second fixing region acts from the housing on the insulator, wherein the first and second clamping forces are directed in opposite directions to one another in the axial direction;
wherein a distance between the first fixing region and the second fixing region in the axial direction defines a clamping length; and
wherein a ratio between the thread length and the clamping length is in a range of 0.7 to 1.3.