Patent ID: 9677526
Date: 2017-06-13
CPC Classifications: F02M

Claim:
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.