Fuel injection valve

Abstract

The invention provides a fuel injection valve, which is used for shortening valve-closing delay time caused by fluid resistance of a fuel passage and reducing minimum injection quantity in an injector of an internal combustion engine. An armature is attracted to the end face of a fixed core of which the center is provided with the fuel passage by electromagnetic force, and a valve body which is driven together with the armature is controlled to open and close a fuel injection port; the center of the upper end face of the armature is provided with a fuel storage position; a through hole of which one end is provided with an opening towards the fuel storage position and which extends along the axial direction, and the fuel passage which extends to the outer side of the radius direction from the fuel storage position and supplies a fuel to a magnetic gap between the upper end face of the armature and the lower end face of the fixed core are formed on the armature; in addition, the opening of the through hole on the upper end face of the armature is at least partially opposite to a fuel lead-in port of the fixed core; furthermore, the opening part of the through hole is provided with a fuel lead-in part for capturing the fuel flowing from the central side to the outer side of the armature and leading the fuel in the through hole.

Description

technical field [0001] The present invention relates to a fuel injection valve for an internal combustion engine, in particular to a fuel injection valve which uses an electromagnetically driven movable element to open and close a fuel passage. Background technique [0002] As a conventional fuel injection valve of this type, JP-A-11-22585 discloses a method for reducing fluid resistance when the armature moves and improving valve operation efficiency by providing longitudinal grooves on the outer peripheral portion of the armature. Responsiveness. [0003] It is described in JP-A-58-178863 or JP-A-2006-22721 that the movable element is composed of a cylindrical armature, a plunger located at the center of the armature, and a device. In the valve body at the front end of the plunger, a magnetic gap is provided between the end face of the fixed iron core and the end face of the armature having a fuel introduction hole for introducing fuel in the center, and a magnetic flux i...

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned prior art, the fluid resistance of the fuel passage provided in the armature affects the operation of the armature, and the responsiveness at the time of valve opening or closing cannot be sufficiently improved.

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