Patent ID: 8230839
Filing Date: 2012-07-31
Classification: F02M

Abstract:
1. A fuel injection valve comprising: an anchor having a cylindrical shape; a plunger located at a center part of said anchor; a valve disc disposed at a top end part of said plunger; a stationary core having a fuel introduction bore for introducing fuel centerward; and an electromagnetic coil for applying a magnetic flux to a magnetic path including a magnetic attraction gap formed between an end face part of said anchor and an end face part of said stationary core; the arrangement of said fuel injection valve being such that a force of magnetic attraction is produced between said end face part of said anchor and said end face part of said stationary core by said magnetic flux that passes through said magnetic gap, said force of magnetic attraction being used to attract said anchor to said stationary core for driving a movable member; whereby said valve disc is moved off a valve seat thereof to open a fuel path provided on said valve seat; wherein said anchor of said fuel injection valve comprises: a recessed part formed, on a center part of said anchor, at a position opposed to an end part of said fuel introduction bore in said stationary core; and a plurality of through holes extending axially through said anchor in a fashion that each of said plurality of through holes is open to a periphery part of said plunger; wherein a part of a fuel entry of each said through hole is open to a bottom face part of said recessed part, and the remaining part of said fuel entry of said each through hole is open to an end face part of said anchor; and wherein a part of each said through hole is formed on an inner circumferential face part of said recessed part of said anchor, and each said through hole is extended axially in a fashion that each said through hole penetrates from a bottom part of said recessed part to an end face part opposite to the stationary core side of said anchor.