A spark plug having a fuel injector valve.

摘要

In a spark plug (1) having a fuel injector valve (100), a tubular insulator (4) is provided in a cylindrical metallic shell (3). A front end of the insulator (4) is fixedly secured in the metallic shell (3) and a rear end of the insulator (4) is slightly extended beyond the metallic shell (3). A tubular center electrode (5) is provided in the axial bore of the insulator. An inner space of the center electrode (5) forms a fuel passage (11), and a front end the center electrode (5) forms a fuel injection nozzle (51). An electromagnetic valve body (54) is provided in the fuel passage (11) to open and close the fuel injection nozzle (51). An electromagnetic coil (200) is provided in a manner to surround the rear end of the insulator (4) to actuate the electromagnetic valve body (54).