Patent ID: 6719224
Filing Date: 2004-04-13
Classification: B60H,F02D,F02M,F25B,Y02T

Abstract:
A fuel injector comprising:an elongated valve element; a spring for urging the valve element in a valve closing direction; and an electromagnetic actuator having an armature integral with an end portion of the valve element and adapted to be attracted to a stator against the biasing force of the spring when a coil is energized, wherein: an oil pressure damper chamber is formed between an end face of the armature and an end face of the stator; one of the end face of the armature and the end face of the stator is generally flat; the other one of the end face of the armature and the end face of the stator includes an annular protuberance, which axially protrudes from the rest of the other one of the end face of the armature and the end face of the stator and radially inwardly defines the oil pressure damper chamber; and at least one cutout portion is formed in the annular protuberance to extend through a wall of the annular protuberance in a direction generally perpendicular to an axial direction of the valve element.