Spark-ignition direct fuel injection valve

Patent metadata

Field	Value
Publication number	US-9677526-B2
Application number	US-201214379973-A
Country	US
Kind code	B2
Filing date	Dec 7, 2012
Priority date	Mar 26, 2012
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

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

The invention claimed is:

1. A spark-ignition direct fuel injection valve, comprising:
a seat member provided with a first fuel injection hole, a second fuel injection hole, and a valve seat; and
a valve body which controls fuel injection from the first injection hole and the second injection hole by contacting and separating from the valve seat,
wherein the first 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,
wherein the second 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,
wherein an opening edge of the injection hole inlet of the first injection hole has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet of the first injection hole,
wherein the first round-chamfered portion has a first curvature radius at a first intersection point at which the opening edge of the injection hole inlet of the first injection hole intersects with a virtual plane, and has a second curvature radius smaller than the first curvature at a second intersection point at which the opening edge of the injection hole inlet of the first injection hole intersects with the virtual plane,
wherein in a plan view, a first non-zero angle is formed by a first plane that contains a first injection hole axis connecting a center of the injection hole inlet of the first injection hole and a center of the injection hole outlet of the first injection hole and is parallel to an axis of the valve body and a second plane that contains a center of an open portion of the injection hole inlet of the first injection hole and an axis of the valve body,
wherein in the plan view, a second non-zero angle is formed by the second plane and a third plane that contains a second injection hole axis connecting a center of the injection hole inlet of the second injection hole and a center of the injection hole outlet of the second injection hole and is parallel to the axis of the valve body, the second plane containing a center of an open portion of the injection hole inlet of the second injection hole,
wherein the seat member has a cut-away portion outside the injection hole outlet of the first injection hole, which is open outwardly of the seat member, and
wherein an extending length (L) of the first injection hole is three or less times a hole diameter (D) of the first injection hole.

2. The spark-ignition direct fuel injection valve according to claim 1 , wherein the portion of the first round-chamfered portion at the second intersection point is formed on a downstream side with respect to the fuel flow toward the injection hole inlet of the first injection hole.

3. The spark-ignition direct fuel injection valve according to claim 2 , wherein the portion of the first round-chamfered portion at the first intersection point is formed such that an inertial force for breaking away from an inner wall surface of the first injection hole of the fuel flow toward the injection hole inlet of the first injection hole is largest.

4. The spark-ignition direct fuel injection valve according to claim 1 ,
wherein an inner side of the seat member makes up a conical surface, and
wherein the injection hole inlet of the first injection hole is open to the inner side making up the conical surface of the seat member.

5. The spark-ignition direct fuel injection valve according to claim 4 , wherein the valve seat is provided on the inner side making up the conical surface of the seat member.

6. The spark-ignition direct fuel injection valve according to claim 5 ,
wherein a plurality of the injection holes including the first injection hole and the second injection hole are provided,
wherein each of the plurality of the injection holes has an injection hole axis connecting a center of the injection hole inlet and a center of the injection hole outlet, and
wherein the injection hole axis of each of the plurality of the injection holes is oriented along a generatrix of either one of two virtual circular cones sharing a vertex and an axis and having different vertex angles.

7. A spark-ignition direct fuel injection valve, comprising, at least, a seat member provided with a plurality of fuel injection holes and a valve seat and a valve body which controls fuel injection from the injection holes by contacting and separating from the valve seat,
wherein each of the plurality of fuel injection holes 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,
wherein each of the plurality of the injection holes has an injection hole axis connecting a center of the injection hole inlet and a center of the injection hole outlet,
wherein the plurality of the injection holes include a first group of injection holes, each of which has an injection hole axis oriented along a generatrix of a first virtual circular cone, and a second group of injection holes, each of which has an injection hole axis oriented along a generatrix of a second virtual circular cone, and
wherein the first virtual circular cone and the second virtual circular cone share a vertex and an axis and have different vertex angles.

8. The spark-ignition direct fuel injection valve according to claim 1 , wherein in the plan view, the second plane divides a view plane perpendicular to the second plane into two portions, and the first non-zero angle and the second non-zero angle are formed on the same portion of the view plane.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

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

Classifications

• 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

• F02M67/12 Primary

  having valves · CPC title

• F02M51/0671

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

• F02M51/0675

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

• F02M61/1833

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