Spark-ignition direct fuel injection valve

Patent metadata

Field	Value
Publication number	US-10704518-B2
Application number	US-201816012275-A
Country	US
Kind code	B2
Filing date	Jun 19, 2018
Priority date	Mar 26, 2012
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A spark-ignition direct fuel injection valve includes, at least, a seat member provided with a fuel injection hole and a valve seat and a valve body which controls fuel injection from the injection hole by contacting and separating from the valve seat. In the spark-ignition direct fuel injection valve: the injection hole has an injection hole inlet which is open inwardly of the seat member and an injection hole outlet which is open outwardly of the seat member; an opening edge of the injection hole inlet has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet; and an extending length (L) of the injection hole does not exceed three times a hole diameter (D) of the injection hole.

First claim

What is claimed is:

1. A spark-ignition direct fuel injection valve, comprising,
a seat member provided with a fuel injection hole; and
a valve body which controls fuel injection from the fuel injection hole by selectively contacting and separating from a valve seat,
wherein the fuel injection hole has a fuel injection hole inlet which is open inwardly of the seat member and a fuel injection hole outlet which is open outwardly of the seat member,
wherein an opening edge of the fuel injection hole inlet of the fuel injection hole has a round-chamfered portion,
wherein the seat member has an expanded opening which is expanded in cross sectional area outwardly from the fuel injection hole outlet such that a distance from a front end side of the seat member to a side wall portion on the front end side of the extended opening is a same distance as a distance from an end side opposite to the front-end side to a side wall portion opposite to the front end side of the extended opening,
wherein a length of the fuel injection hole is longer than a length of the expanded opening in an injection axis direction,
wherein the cross-sectional area of the fuel injection hole is continuously smaller from the round-chamfered portion of the fuel injection hole inlet to the fuel injection hole outlet,
wherein a width of the expanded opening in a radial direction is formed larger than a width of an end of the round-chamfered portion,
wherein the expanded opening expands stepwise outwardly from the fuel injection hole outlet, and has a cross-sectional area of a single rectangle,
wherein a width of a side of the single rectangle that extends in the radial direction is larger than a width of an outer end of the round-chamfered portion, and
wherein the fuel injection hole outlet is separated by a distance from a side of the single rectangle that extends perpendicular to the radial direction, and a width of the fuel injection hole outlet is smaller than the distance.

2. The spark-ignition direct fuel injection valve according to claim 1 ,
wherein an extending length of the fuel injection hole is three or less times a hole diameter of the fuel injection hole.

3. The spark-ignition direct fuel injection valve according to claim 1 , wherein the fuel injection hole has a diameter D measured at a boundary between the round-chamfered portion and a side surface of the fuel injection hole, the fuel injection hole has a length L, and a relationship L/D≤3 is satisfied.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Yasukawa Yoshihito
• Ogura Kiyotaka
• Miyake Takao
• Ishii Eiji
• Abe Motoyuki
• Ishikawa Tohru

Classifications

• F02M51/0671

  the armature having an elongated valve body attached thereto · CPC title

• F02M61/1833

  Discharge orifices having changing cross sections, e.g. being divergent · CPC title

• F02M67/12

  having valves · CPC title

• F02M51/0675

  the valve body having cylindrical guiding or metering portions, e.g. with fuel passages · CPC title

• F02M61/1813 Primary

  Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other · CPC title