Patent ID: 8316826
Filing Date: 2012-11-27
Classification: F02M

Abstract:
1. A fuel injector comprising: an injector body defining a nozzle outlet; a solenoid assembly including a stator assembly having a bottom stator surface and an armature having a top armature surface and a bottom armature surface; the stator assembly being closer to the top armature surface than the bottom armature surface; an electronically controlled control valve assembly including a control valve member attached to the armature; the armature movable between a first armature position and a second armature position inside an armature cavity partially defined by an inner surface of the injector body; a spring biasing the armature away from the stator assembly towards the second armature position; a final air gap being a distance between the top armature surface and the bottom stator surface when the armature is in the first armature position; a final squish film drag gap being a distance between the bottom armature surface and an inner surface of the injector body when the armature is in the second armature position; and the final squish film drag gap being the same order of magnitude as the final air gap.