Patent ID: 9653887
Date: 2017-05-16
CPC Classifications: F02B,F02P,H01T,Y02T

Claim:
1. A spark plug for a prechamber internal combustion engine, comprising: a body with a passage and a front end; a center electrode that is located in the passage of the body and that projects past the front end of the body; seated inside the passage of the body, an insulator that surrounds a section of the center electrode located within the body, and has a tapering front end that together with the passage forms a free annular space within the body; a ground electrode with an annular ignition section that surrounds a section of the center electrode located outside the body, forming a spark gap; the ground electrode has at least one mounting section connected in an electrically conductive manner to the front end of the body and has at least two web sections connecting the ignition section to the mounting section; located between the web sections of the ground electrode are scavenging ports through which the annular space located in the body stands in connection with the environment outside the spark plug, and which permit good scavenging of the annular space and the spark gap with the combustion gas/air mixture flowing into the prechamber of the internal combustion engine when the spark plug is operated; wherein an open area of the scavenging ports of the ground electrode is at least 20% and at most 50% of an open area of the annular space at the front end of the body.